GRIB inventory last updated: 4/12/95


These files have the form NAME.YYMM:
-----------------------------------------------------------------------

dates - 
	Contains:

	a list of dates one per line of the form YYMMDDHH

dgn -
	Contains:

		LRGHR - Large scale condensation heating rate  K/s
		CNVHR - Deep convective heating rate           K/s
		SHAHR - Shallow convective heating rate        K/s
		VDFHR - Vertical diffusion heating rate        K/s
		SWHR  - Solar radiative heating rate           K/s
		LWHR  - Longwave radiative heating rate        K/s

	monthly averages at sigma levels.  The averages start 6 hours after
	the reference time in the file.

These files have the form NAMEYYMMDDHH:
----------------------------------------------------------------------------

prepqm	- Observed data with all metadata (BUFR format)  
	  The four basic 32-bit binary files are:
sanl    - All basic analysis data (sigma), spectral
sfcanl  - All other fields for forecast run (SST, flux, etc.)
sges    - All basic analysis data (sigma), spectral from the end of 
          6-hr forecast.
bges    - All flux fields, etc. from 6-hour forecast


grb2d   - Synop sort fluxes, Gaussian grid
		SFC   ALBDO - Surface; Albedo				%
		SFC   CDCON - Surface; Convective cloud cover		%
		NTAT  CFNLF - Nominal top of atmosphere;
			      Cloud forcing net long wave flux       W/m**2
		SFC   CFNLF - Surface; 
			      Cloud forcing net long wave flux       W/m**2
		EATM  CFNLF - entire atmosphere considered as a single layer; 
			      Cloud forcing net long wave flux       W/m**2
		NTAT  CFNSF - Nominal top of atmosphere;
			      Cloud forcing net solar flux           W/m**2
		SFC   CFNSF - Surface; Cloud forcing net solar flux  W/m**2
		EATM  CFNSF - entire atmosphere considered as a single layer; 
			      Convective cloud cover                    %
		SFC   CPRAT - Surface; 
			      Convective precipitation rate          kg/m**2/s
		SFC   CSDFL - Surface; No such variable.  PDS entry 
			      is 163 which is CSDLF - Clear sky 
			      downward long wave flux W/m**2.  My 
			      theory is that there is a mistake in 
			      UNPKGRB1. cf. CSULF.
		SFC   CSDSF - Surface; 
			      Clear sky downward solar flux          W/m**2
		NTAT  CSULF - Nominal top of atmosphere;
			      Clear sky upward long wave flux        W/m**2
		NTAT  SCUSF - Nominal top of atmosphere;
			      No such variable.  The PDS entry is 
		              160 which is CSUSF - Clear sky upward 
			      solar flux W/m**2.  My theory is that 
			      there is a mistake in UNPKGRB1.  
			      cf. CSDSF
		SFC   SCUSF - Surface; see preceeding.
		EATM  CWORK - Entier atmosphere; Cloud work function  J/Kg
			      Not a 6-hour average.
		SFC   DLWRF - Surface; Downward long wave 
			      radiation flux      		     W/m**2
		NTAT  DSWRF - Nominal top of atmosphere;
			      Downward long wave radiation flux      W/m**2
		SFC   DSWRF - Surface; Downward solar radiation flux W/m**2
		SFC   GFLUX - Surface;Ground heat flux               W/m**2
		SFC   ICE C - Ice concentration (ice=1;no ice=0)     fraction
			      Not a 6-hour average.
		SFC   LAND  - Land-sea mask
			      Not a 6-hour average.
		SFC   LHTFL - Surface; Latent heat net flux          W/m2
		SFC   NBDSF - Surface; Near IR beam downward 
			      solar flux       			     W/m**2
		SFC   NDDSF - Surface; Near IR diffuse downward 
			      solar flux    			     W/m**2
		SFC   PEVPR - Surface; Potential evaporation rate    w/m**2
			      Not a 6-hour average.  		    
		SFC   PRATE - Surface; Precipitation rate            kg/m2/s
		HCTL  PRES  - High cloud top;
			      Pressure				     Pa
		HCBL  PRES  - High cloud bottom;
                              Pressure                               Pa
		MCTL  PRES  - Middle cloud top;
			      Pressure                               Pa
		MCBL  PRES  - Middle cloud bottom;
			      Pressure                               Pa
		LCTL  PRES  - Low cloud top;
			      Pressure                               Pa
		LCBL  PRES  - Low cloud bottom;
			      Pressure                               Pa
		SFC   PRES  - Surface
			      Pressure                               Pa
			      Not a 6-hour average.
		SFC   WAT R - Surface; PDS value 90, listed as
			      RUNOF in Grib Guide.
			      Water runoff                           kg/m2
			      Not a 6-hour average.
		SFC   SFC R - Surface; Surface roughness              m
			      Not a 6-hour average.
		HCTL  MLYNO - High cloud top;
			      Nearby model level                     integer
		HCBL  MLYNO - High cloud bottom;
			      Nearby model level                     integer
		MCTL  MLYNO - Middle cloud top;
			      Nearby model level                     integer
		MCBL  MLYNO - Middle cloud bottom;
			      Nearby model level                     integer
		LCTL  MLYNO - Low cloud top;
			      Nearby model level                     integer
		LCBL  MLYNO - Low cloud bottom;
			      Nearby model level                     integer
		SFC   SHTFL - Surface; Sensible heat net flux        W/m2
	0 cm-10 cm    SOILW - Volumetric soil moisture content       fraction
			      Not 6-hour averages.
      10 cm-200 cm    SOILW - Volumetric soil moisture content       fraction
			      Not 6-hour averages.
		2m    SPF H - Specific humidity                      kg/kg
			      Not 6-hour averages.
		HCY   T PSL - Unknown, PDS value is 234;
			      Total cloud cover                      %
		MCY   T PSL - Unknown, PDS value is 224;
			      Total cloud cover                      %
		LCY   T PSL - Unknown, PDS value is 214;
			      Total cloud cover                      %
	       2m     T MAX - Maximum temperature                    deg. K
			      Not a 6-hour average.
	       2m     T MIN - Minimum temperature                    deg. K
			      Not a 6-hour average.
		SFC   TMP   - Surface; Temperature                   deg. K
			      Not a 6-hour average.
	0 cm-10 cm    TMP   - Temperature                            deg. K
			      Not a 6-hour average.
      10 cm-200 cm    TMP   - Temperature                            deg. K
			      Not a 6-hour average.
            300 cm    TMP   - Temperature                            deg. K
			      Not a 6-hour average.
	       2m     TMP   - Temperature                            deg. K
		HCTL  TMP   - High cloud top;
			      Temperature                            deg. K
		LCTL  TMP   - Low cloud top;
			      Temperature                            deg. K
		MCTL  TMP   - Middle cloud top;
			      Temperature                            deg. K
		SFC   U-GWD - Surface, Zonal gravity wave stress     N/m**2
		SFC   U FLX - Surface, Momentum flux, u component    N/m2
	      10m     U GRD - u-component of wind                    m/s
			      Not a 6-hour average.
		NTAT  ULWRF - Nominal top of atmosphere;
			      Upward long wave radiation flux        W/m**2
		SFC   ULWRF - Surface;
			      Upward long wave radiation flux        W/m**2
		NTAT  USWRF - Nominal top of atmosphere;
			      Upward solar radiation flux            W/m**2
		SFC   USWRF - Surface;
			      Upward solar radiation flux            W/m**2
		SFC   V-GWD - Surface;
			      Meridional gravity wave stress         N/m**2
		SFC   VBDSF - Surface;
			      Visible beam downward solar flux       W/m**2
		SFC   VDDSF - Surface;
			      Visible diffuse downward solar flux    W/m**2
		SFC   V FLX - Surface;
			      Momentum flux, v component             N/m2
	      10m     V GRD - v-component of wind                    m/s
			      Not a 6-hour average.
		SFC   WEASD - Surface; 
			      Water equiv. of accum. snow depth     kg/m2
			      Not a 6-hour average.

	All variables are 6-hour averages for the 6 hours after the reference
	time in the file, EXCEPT for CWORK, ICE C, LAND, PEVPR, PRES, WAT R,
	SFC R, SOILW, SPF H, T MAX, T MIN, TMP (for soil? measurements), 
	U GRD, V GRD, WEASD where noted.  The level abbreviation is interpreted
	except where the level is given explicitly.

grb3d - Model diagnostics each 6 hours on sigma levels, GRIB format, Gaussian
	grid.
 
	Contains: 
		CNVHR - Deep convective heating rate           K/s
		CNVMR - Deep convective moistening rate        kg/kg/s
		LRGHR - Large scale condensation heating rate  K/s
		LWHR  - Longwave radiative heating rate        K/s
		SHAHR - Shallow convective heating rate        K/s
		SHAMR - Shallow convective moistening rate     kg/kg/s
		SWHR  - Solar radiative heating rate           K/s
		VDFHR - Vertical diffusion heating rate        K/s
		VDFMR - Vertical diffusion moistening rate     kg/kg/s
		VDFUA - Vertical diffusion zonal accel         m/s/s
		VDFVA - Vertical diffusion meridional accel    m/s/s

	All variables are defined on Sigma levels (SIG).
	6 - Hr averages for the 6 hours after the reference time in the file.



znl.f00 - Zonal band averages of analysis (each 6 hours).  Not in GRIB format.
znl.f06 - Zonal band averages of guess (each 6 hours).  Not in GRIB format.

grbsanl	- Sigma analyses, Gaussian grid.

	Contains:

		REL V  - Relative vorticity                     /s
		REL D  - Relative divergence                    /s
		TMP    - Temperature                            deg. K
		U GRD  - u-component of wind                    m/s
		V GRD  - v-component of wind                    m/s
		SPF H  - Specific humidity                      kg/kg

	All defined on SIGMA levels-.9950, .9821, .9644, .9425, .9159,
        .8838, .8458, .8014, .7508, .6943, .6329, .5681, .5017, .4357,
	.3720, .3125, .2582, .2101, .1682, .1326, .1028, .0782, .0580,
	.0418, .0288, .0183, .0101, .0027

       		SFC   LPS X - Surface; x-gradient of log pressure  1/m
       		SFC   LPS Y - Surface; y-gradient of log pressure  1/m
       		SFC   PRES  - Surface; Pressure                    Pa
       		SFC   HGT   - Surface; Geopotential height         gpm
       		SFC   HGT X - Surface; x-gradient of height        m/m
       		SFC   HGT Y - Surface; y-gradient of height        m/m

	All data is defined at the reference time in the file.

grbsf06 - Sigma guess, Gaussian grid.

	Contains:
		
		The same variables as grbsanl.  These are guesses for
	6 hours after the reference time in the file.

pgb.f00 - Analysis stack, 2.5 degrees pressure.
	  Same data as pgb.f06, except the analysis is for the reference
	  time in the file.
pgb.f06 - Guess stack, 2.5 degrees, pressure.	

	Contains:

                    HGT   - Geopotential height                    gpm
                    U GRD - u-component of wind                    m/s
                    V GRD - v-component of wind                    m/s
                    TMP   - Temperature                            deg. K
                    ABS V - Absolute vorticity                     /s
	
	At 1000, 925, 850, 700, 600, 500, 400, 300, 250, 200, 150,
	    100,  70,  50,  30,  20, 10 hPa

                    V VEL - Pressure Vertical velocity            Pa/s

        At 1000, 925, 850, 700, 600, 500, 400, 300, 250, 200, 150, 100 hPa

                    R H   - Relative humidity                      %

        At 1000, 925, 850, 700, 600, 500, 400, 300 hPa

 30 SPD     0 SPD   U GRD - layer between two levels at specified 
			    pressure differences from ground 
			    to levels;
			    u-component of wind                    m/s 
 30 SPD     0 SPD   V GRD - layer between two levels at specified
                            pressure differences from ground
                            to levels;
			    v-component of wind                    m/s
 30 SPD     0 SPD   TMP   - layer between two levels at specified
                            pressure differences from ground
                            to levels;
			    Temperature                            deg. K
 30 SPD     0 SPD   R H   - layer between two levels at specified
                            pressure differences from ground
                            to levels;
			    Relative humidity                      %
              SFC   PRES  - Surface; Pressure                      Pa
              SFC   PTEND - Surface; Pressure tendency             Pa/s
              EATM  P WAT - Entire atmosphere; Precipitable water  kg/m2
              EATM  R H   - Entire atmosphere; Relative humidity   %
              TRO   TMP   - tropopause level; Temperature          deg. K
              TRO   PRES  - tropopause level; Pressure             Pa
              TRO   U GRD - tropopause level; u-component of wind  m/s
              TRO   V GRD - tropopause level; v-component of wind  m/s
              TRO   VW SH - tropopause level; Vertical speed shear 1/s
			    PDS value 136, known as VSSH in the 
			    Keith's version of the table.
              SFC   LFT X - Surface; Surface lifted index          K
              SFC   4LFTX - Surface; Best (4-layer) lifted index   K   
              MWSL  TMP   - maximum wind speed level; 
			    Temperature                            deg. K
              MWSL  PRES  - maximum wind speed level; Pressure     Pa
              MWSL  U GRD - maximum wind speed level; 
			    u-component of wind                    m/s   
              MWSL  V GRD - maximum wind speed level; 
                            u-component of wind                    m/s
              SFC   HGT   - Surface; Geopotential height           gpm
              MSL   PRMSL - mean sea level; 
			    Pressure reduced to MSL                Pa
 44 HSIG  100 HSIG  R H   - layer between two sigma levels;
			    Relative humidity                      %
 72 HSIG   94 HSIG  R H   - layer between two sigma levels;     
                            Relative humidity                      %
 44 HSIG   72 HSIG  R H   - layer between two sigma levels;     
                            Relative humidity                      %
       0.9950 SIG   POT   - Sigma level; Potential temperature     deg. K
       0.9950 SIG   TMP   - Sigma level; Temperature               deg. K
       0.9950 SIG   V VEL - Sigma level; 
			    Pressure Vertical velocity            Pa/s
       0.9950 SIG   R H   - Sigma level; Relative humidity        %
       0.9950 SIG   U GRD - Sigma level; u-component of wind      m/s
       0.9950 SIG   V GRD - Sigma level; v-component of wind      m/s

	All guesses are for 6 hours after the reference time in the file.

ipvanl - Analysis on theta derived from sanl (synop sort)

	Contains:

		    SFC   POT    - Surface; Potential temperature    deg. K
		    THEK  TMP    - Temperature                       deg. K
		    THEK  U GRD  - u-component of wind                m/s
		    THEK  V GRD  - v-component of wind                m/s   
		    THEK  V VEL  - Pressure Vertical velocity         Pa/s   
		    THEK  R H    - Relative humidity                  %
		    THEK  MNTSF  - Montgomery stream function         m2/s2
		    THEK  BVF2   - Brunt-Vaisala frequency squared    1/s**2
		    THEK  PV     - Potential vorticity                m**2/s/kg

	All data at isentropic (theta) levels, 270, 280, 290, 300, 315,
	330, 350, 400, 450, 550, 650 (with the exception of the potential 
	temperature).  Data is for the reference time in the file.
		
optavg - Optimal averages (each 6 hours).  Not in GRIB format.


These files are of the form NAMEtht.LEVEL.YYMM
-----------------------------------------------------------------------

ABSV - 
	Contains:
		
		ABS V - Absolute vorticity                     /s

	For 0Z, 6Z, 12Z and 18Z for the entire month at the specificed Theta
	level.  The month and theta level are referenced in the file name 
	and encoded in the file.  Files are available for THETA = 270, 280,
	290, 300, 315, 330, 350, 400, 450, 550, 650

BVF2 - 
	Contains:

		Brunt-Vaisala frequency squared        1/s**2

        For 0Z, 6Z, 12Z and 18Z for the entire month at the specificed Theta
        level.  The month and theta level are referenced in the file name 
        and encoded in the file.  Files are available for THETA = 270, 280,
        290, 300, 315, 330, 350, 400, 450, 550, 650

MNTSF - 
	Contains:

		Montgomery stream function             m2/s2

        For 0Z, 6Z, 12Z and 18Z for the entire month at the specificed Theta
        level.  The month and theta level are referenced in the file name 
        and encoded in the file.  Files are available for THETA = 270, 280,
        290, 300, 315, 330, 350, 400, 450, 550, 650


PV___ -

	Contains:

		Potential vorticity                    m**2/s/kg

        For 0Z, 6Z, 12Z and 18Z for the entire month at the specificed Theta
        level.  The month and theta level are referenced in the file name 
        and encoded in the file.  Files are available for THETA = 270, 280,
        290, 300, 315, 330, 350, 400, 450, 550, 650


RH    - 
	
	Contains:

		Relative humidity                      %

        For 0Z, 6Z, 12Z and 18Z for the entire month at the specificed Theta
        level.  The month and theta level are referenced in the file name 
        and encoded in the file.  Files are available for THETA = 270, 280,
        290, 300, 315, 330, 350, 400, 450, 550, 650

TMP   -

	Contains:

		Temperature                            deg. K

        For 0Z, 6Z, 12Z and 18Z for the entire month at the specificed Theta
        level.  The month and theta level are referenced in the file name 
        and encoded in the file.  Files are available for THETA = 270, 280,
        290, 300, 315, 330, 350, 400, 450, 550, 650

UGRD   -
	Contains:

		u-component of wind                    m/s

        For 0Z, 6Z, 12Z and 18Z for the entire month at the specificed Theta
        level.  The month and theta level are referenced in the file name 
        and encoded in the file.  Files are available for THETA = 270, 280,
        290, 300, 315, 330, 350, 400, 450, 550, 650

UMAS    - This is GRIB variable number 178.  The GRIB decoder does not know
	  what 178 is.  We are assuming that it is the variable in the table
	  received from krs.  I.e.
	  
		Mass weighted u                        gm/m*K*s

        For 0Z, 6Z, 12Z and 18Z for the entire month at the specificed Theta
        level.  The month and theta level are referenced in the file name 
        and encoded in the file.  Files are available for THETA = 270, 280,
        290, 300, 315, 330, 350, 400, 450, 550, 650

VGRD    - 
	Contains:

		v-component of wind                    m/s

        For 0Z, 6Z, 12Z and 18Z for the entire month at the specificed Theta
        level.  The month and theta level are referenced in the file name 
        and encoded in the file.  Files are available for THETA = 270, 280,
        290, 300, 315, 330, 350, 400, 450, 550, 650

VMAS    - This is GRIB variable number 179.  The GRIB decoder does not know   
          what 179 is.  We are assuming that it is the variable in the table
          received from krs.  I.e.
          
                Mass weighted v                        gm/m*K*s


        For 0Z, 6Z, 12Z and 18Z for the entire month at the specificed Theta
        level.  The month and theta level are referenced in the file name 
        and encoded in the file.  Files are available for THETA = 270, 280,
        290, 300, 315, 330, 350, 400, 450, 550, 650

VVEL    -

	Contains:

		Pressure Vertical velocity            Pa/s

        For 0Z, 6Z, 12Z and 18Z for the entire month at the specificed Theta
        level.  The month and theta level are referenced in the file name 
        and encoded in the file.  Files are available for THETA = 270, 280,
        290, 300, 315, 330, 350, 400, 450, 550, 650

These files are of the form NAMEtht.LEVEL.grib.YYMM
-----------------------------------------------------------------------

ABSV -
        Contains:

                ABS V - Absolute vorticity                     /s

        average and covariance for the month at the specificed Theta
        level.  The month and theta level are referenced in the file name
        and encoded in the file.  Files are available for THETA = 270, 280,
        290, 300, 315, 330, 350, 400, 450, 550, 650

BVF2 -
        Contains:

                Brunt-Vaisala frequency squared        1/s**2

        average and covariance for the month at the specificed Theta
        level.  The month and theta level are referenced in the file name
        and encoded in the file.  Files are available for THETA = 270, 280,
        290, 300, 315, 330, 350, 400, 450, 550, 650
MNTSF -
        Contains:

                Montgomery stream function             m2/s2

        average and covariance for the month at the specificed Theta
        level.  The month and theta level are referenced in the file name
        and encoded in the file.  Files are available for THETA = 270, 280,
        290, 300, 315, 330, 350, 400, 450, 550, 650


PRES -

        Contains:

                Pressure                               Pa

        average and covariance for the month at the specificed Theta
        level.  The month and theta level are referenced in the file name
        and encoded in the file.  Files are available for THETA = 270, 280,
        290, 300, 315, 330, 350, 400, 450, 550, 650

PV___ -

        Contains:

                Potential vorticity                    m**2/s/kg

        average and covariance for the month at the specificed Theta
        level.  The month and theta level are referenced in the file name
        and encoded in the file.  Files are available for THETA = 270, 280,
        290, 300, 315, 330, 350, 400, 450, 550, 650

RH -
	Contains:

                Relative humidity                      %

        average and covariance for the month at the specificed Theta
        level.  The month and theta level are referenced in the file name
        and encoded in the file.  Files are available for THETA = 270, 280,
        290, 300, 315, 330, 350, 400, 450, 550, 650

TCDC -

	Contains:

                Total cloud cover                      %

        average and covariance for the month at the specificed 
        level.  The month and level are referenced in the file name
        and encoded in the file.  The levels are low, mid and hi.

TMP -
        Contains:

                Temperature                            deg. K

        average and covariance for the month at the specificed Theta
        level.  The month and theta level are referenced in the file name
        and encoded in the file.  Files are available for THETA = 270, 280,
        290, 300, 315, 330, 350, 400, 450, 550, 650

UGRD -
        Contains:

                u-component of wind                    m/s

        average and covariance for the month at the specificed Theta
        level.  The month and theta level are referenced in the file name
        and encoded in the file.  Files are available for THETA = 270, 280,
        290, 300, 315, 330, 350, 400, 450, 550, 650

UMAS	 -
        Contains:

                Mass weighted u                        gm/m*K*s

        average and covariance for the month at the specificed Theta
        level.  The month and theta level are referenced in the file name
        and encoded in the file.  Files are available for THETA = 270, 280,
        290, 300, 315, 330, 350, 400, 450, 550, 650

VGRD -
        Contains:

                v-component of wind                    m/s

        average and covariance for the month at the specificed Theta
        level.  The month and theta level are referenced in the file name
        and encoded in the file.  Files are available for THETA = 270, 280,
        290, 300, 315, 330, 350, 400, 450, 550, 650

VMAS     -
        Contains:

                Mass weighted v                        gm/m*K*s

        average and covariance for the month at the specificed Theta
        level.  The month and theta level are referenced in the file name
        and encoded in the file.  Files are available for THETA = 270, 280,
        290, 300, 315, 330, 350, 400, 450, 550, 650

VVEL     -
        Contains:

                Pressure Vertical velocity            Pa/s

        average and covariance for the month at the specificed Theta
        level.  The month and theta level are referenced in the file name
        and encoded in the file.  Files are available for THETA = 270, 280,
        290, 300, 315, 330, 350, 400, 450, 550, 650

These files are of the form NAMEprs.LEVEL.YYMM
-----------------------------------------------------------------------

ABSV -
        Contains:

                ABS V - Absolute vorticity                     /s

        For 0Z, 6Z, 12Z and 18Z for the entire month at the specificed pressure
        level.  The month and pressure level are referenced in the file name
        and encoded in the file.  Files are available for hPa = 10, 20, 30,
        50, 70, 100, 150, 200, 250, 300, 400, 500, 600, 700, 850, 925, 1000

HGT -

        Contains:

                Geopotential height                    gpm

        For 0Z, 6Z, 12Z and 18Z for the entire month at the specificed pressure
        level.  The month and pressure level are referenced in the file name
        and encoded in the file.  Files are available for hPa = 10, 20, 30,
        50, 70, 100, 150, 200, 250, 300, 400, 500, 600, 700, 850, 925, 1000

RH - 

        Contains:

                Relative humidity                      %

        For 0Z, 6Z, 12Z and 18Z for the entire month at the specificed pressure
        level.  The month and pressure level are referenced in the file name
        and encoded in the file.  Files are available for hPa = 300, 400, 500, 
	600, 700, 850, 925, 1000

SPFH -

        Contains:

                Specific humidity                      kg/kg

        For 0Z, 6Z, 12Z and 18Z for the entire month at the specificed pressure
        level.  The month and pressure level are referenced in the file name
        and encoded in the file.  Files are available for hPa = 300, 400, 500,
        600, 700, 850, 925, 1000

TMP -

        Contains:

                Temperature                            deg. K

        For 0Z, 6Z, 12Z and 18Z for the entire month at the specificed pressure
        level.  The month and pressure level are referenced in the file name
        and encoded in the file.  Files are available for hPa = 10, 20, 30,
        50, 70, 100, 150, 200, 250, 300, 400, 500, 600, 700, 850, 925, 1000

UGRD - 

	Contains:

                u-component of wind                    m/s

        For 0Z, 6Z, 12Z and 18Z for the entire month at the specificed pressure
        level.  The month and pressure level are referenced in the file name
        and encoded in the file.  Files are available for hPa = 10, 20, 30,
        50, 70, 100, 150, 200, 250, 300, 400, 500, 600, 700, 850, 925, 1000

VGRD -

        Contains:

                v-component of wind                    m/s

        For 0Z, 6Z, 12Z and 18Z for the entire month at the specificed pressure
        level.  The month and pressure level are referenced in the file name
        and encoded in the file.  Files are available for hPa = 10, 20, 30,
        50, 70, 100, 150, 200, 250, 300, 400, 500, 600, 700, 850, 925, 1000

VVEL -

        Contains:

                Pressure Vertical velocity            Pa/s

        For 0Z, 6Z, 12Z and 18Z for the entire month at the specificed pressure
        level.  The month and pressure level are referenced in the file name
        and encoded in the file.  Files are available for hPa = 100, 150, 200, 
	250, 300, 400, 500, 600, 700, 850, 925, 1000

These files are of the form NAME.LEVEL.grib.YYMM
-----------------------------------------------------------------------

DIV -

	Contains:

		Relative divergence                    /s

	monthly average at the specified pressure level.  The month
	and pressure level are referenced in the file name and encoded
	in the file.  Files are available for hPa = 10, 20, 30, 50, 70,
	100, 150, 200, 250, 300, 400, 500, 600, 700, 850, 925, 1000
HGT -

        Contains:

                Geopotential height                    gpm

	monthly average and covariance  at the specified pressure
	level.  The month and pressure level are referenced in the file
	name and encoded in the file.  Files are available for hPa =
	10, 20, 30, 50, 70, 100, 150, 200, 250, 300, 400, 500, 600,
	700, 850, 925, 1000

RELV -

        Contains:

                Relative vorticity                     /s

	monthly average at the specified pressure level.  The month and
	pressure level are referenced in the file name and encoded in
	the file.  Files are available for hPa = 10, 20, 30, 50, 70,
	100, 150, 200, 250, 300, 400, 500, 600, 700, 850, 925, 1000

RH -

        Contains:

                Relative humidity                      %

        monthly average at the specified pressure level.  The month and
        pressure level are referenced in the file name and encoded in
        the file.  Files are available for hPa = 300, 400, 500, 600, 700, 
	850, 925, 1000

SOILW - 

	Contains:

		Volumetric soil moisture content       fraction
		
	monthly average at the specified soil depth.  The average
	begins 3 hours after the reference time in the file.  The
	covariance begins 6 hours after the reference time in the
	file.  The month and pressure level are referenced in the file
	name and encoded in the file.  Files are available for 10cm and
	200cm.

SPFH - 

        Contains:

                Specific humidity                      kg/kg

	monthly average and covariance for the specified pressure
	level.  The month and level are referenced in the file name
	and encoded in the file.  Pressure levels are hPa = 1000, 925,
	850, 700, 600, 500, 400 and 300.

STRM -

        Contains:

                Stream function                        m2/s

	monthly average for the specified pressure level.  The month
	and level are referenced in the file name and encoded in the
	file.  Pressure levels are hPa = 10, 20, 30, 50, 70, 100, 150,
	200, 250, 300, 400, 500, 600, 700, 850, 925, 1000

TMAX -

	Contains:

                Maximum temperature                    deg. K

	monthly average and covariance for the specified level.  The averages
	begins 3 hours after the reference time in the file.  The month
	and level are referenced in the file name and encoded in the
	file.  The level is 2m.

TMIN -

        Contains:

                Minimum temperature                    deg. K

        monthly average and covariance for the specified level.  The averages
        begins 3 hours after the reference time in the file.  The month
        and level are referenced in the file name and encoded in the
        file.  The level is 2m.

TMP -

        Contains:

                Temperature                            deg. K

	monthly average and covariance at the specified pressure
	level.  The month and pressure level are referenced in the file
	name and encoded in the file.  Files are available for hPa =
	10, 20, 30, 50, 70, 100, 150, 200, 250, 300, 400, 500, 600,
	700, 850, 925, 1000

TMP -

        Contains:

                Temperature                            deg. K

	monthly average and covariance at the specified pressure
	level.  The average begins 3 hours and the covariance begins 6
	hours after the reference time in the file.  The month and
	pressure level are referenced in the file name and encoded in
	the file.  The levels are 10cm, 200cm, 300cm, and 2m.

TMP.VVEL -

        Contains:

                Covariance between T and omega         K*Pa/s

	monthly average at the specified pressure level.  The GRIB
	variable name is CBTW according to the table.  The month and
	pressure level are referenced in the file name and encoded in
	the file.  Files are available for hPa = 100, 150, 200, 250, 
	300, 400, 500, 600, 700, 850, 925, 1000

UGRD -

        Contains:

                u-component of wind                    m/s

        monthly average at the specified pressure level.  The month and
        pressure level are referenced in the file name and encoded in
        the file.  Files are available for hPa = 10, 20, 30, 50, 70,
        100, 150, 200, 250, 300, 400, 500, 600, 700, 850, 925, 1000

UGRD -

        Contains:

                u-component of wind                    m/s

        monthly average and covariance at the specified
        level.  The average begins 3 hours and the covariance begins 6
        hours after the reference time in the file.  The month and
        pressure level are referenced in the file name and encoded in
        the file.  The level is 10m.

UGRD.SPFH - 

	Contains:

                Covariance between u and specific hum  m/s*gm/gm

	monthly average at the specified pressure level.  The GRIB
	variable name is CBUQ.  The month and pressure level are
	referenced in the file name and encoded in the file.  The
	levels are hPa = 300, 400, 500, 600, 700, 850, 925, 1000.

UGRD.TMP - 

        Contains:

                Covariance between u and T             K*m/s

        monthly average at the specified pressure level.  The GRIB
        variable name is CBTZW.  The month and pressure level are
        referenced in the file name and encoded in the file.  The
        levels are hPa = 10, 20, 30, 50, 70, 100, 150, 200, 250, 300, 400, 
	500, 600, 700, 850, 925, 1000

UGRD.VGRD -

        Contains:

                Covariance between v and u             m**2/s**2

	monthly average at the specified pressure level.  The GRIB
	variable name is CBMZW.  The month and pressure level are
	referenced in the file name and encoded in the file.  Files are
	available for hPa = 10, 20, 30, 50, 70, 100, 150, 200, 250,
	300, 400, 500, 600, 700, 850, 925, 1000

UGRD.VVEL -

        Contains:

                Covariance between u and omega         m/s*Pa/s

	monthly average at the specified pressure level.  The GRIB
	variable name is CBUW.  The month and pressure level are
	referenced in the file name and encoded in the file.  Files are
	available for hPa = 100, 150, 200, 250, 300, 400, 500, 600,
	700, 850, 925, 1000

VGRD -

        Contains:

                v-component of wind                    m/s

        monthly average at the specified pressure level.  The month and
        pressure level are referenced in the file name and encoded in
        the file.  Files are available for hPa = 10, 20, 30, 50, 70,
        100, 150, 200, 250, 300, 400, 500, 600, 700, 850, 925, 1000

VGRD -

        Contains:

                v-component of wind                    m/s

        monthly average and covariance at the specified 
        level.  The average begins 3 hours and the covariance begins 6
        hours after the reference time in the file.  The month and
        pressure level are referenced in the file name and encoded in
        the file.  The level is 10m.

VGRD.SPFH -

        Contains:

                Covariance between v and specific hum  m/s*gm/gm

        monthly average at the specified pressure level.  The GRIB
        variable name is CBVQ.  The month and pressure level are
        referenced in the file name and encoded in the file.  The
        levels are hPa = 300, 400, 500, 600, 700, 850, 925, 1000.

VGRD.TMP -

        Contains:

                Covariance between v and T             K*m/s

        monthly average at the specified pressure level.  The GRIB
        variable name is CBTMW.  The month and pressure level are
        referenced in the file name and encoded in the file.  The
        levels are hPa = 10, 20, 30, 50, 70, 100, 150, 200, 250, 300, 400,
        500, 600, 700, 850, 925, 1000

VGRD.VVEL -

        Contains:

                Covariance between v and omega         m/s*Pa/s

        monthly average at the specified pressure level.  The GRIB
        variable name is CBVW.  The month and pressure level are
        referenced in the file name and encoded in the file.  Files are
        available for hPa = 100, 150, 200, 250, 300, 400, 500, 600,
        700, 850, 925, 1000

VPOT -

        Contains:

                Velocity potential                     m2/s

	monthly average at the specified pressure level.  The month and
	pressure level are referenced in the file name and encoded in
	the file.  The levels are hPa = 10, 20, 30, 50, 70, 100, 150,
	200, 250, 300, 400, 500, 600, 700, 850, 925, 1000

VTMP -

        Contains:

                Virtual temperature                    deg. K

	monthly average at the specified pressure level.  The month and
	pressure level are referenced in the file name and encoded in
	the file.  The levels are hPa = 300, 400, 500, 600, 700, 850,
	925, 1000.

VVEL -

        Contains:

                Pressure Vertical velocity            Pa/s

	monthly average at the specified pressure level.  The month and
	pressure level are referenced in the file name and encoded in
	the file.  Files are available for hPa = 100, 150, 200, 250,
	300, 400, 500, 600, 700, 850, 925, 1000

VVEL.SPFH -

        Contains:

                Covariance between spec. hum and omeg  gm/gm*Pa/s

        monthly average at the specified pressure level.  The GRIB
        variable name is CBQW.  The month and pressure level are
        referenced in the file name and encoded in the file.  The
        levels are hPa = 300, 400, 500, 600, 700, 850, 925, 1000.

These files are of the form NAME.grib.YYMM
-----------------------------------------------------------------------

ALBDO -

        Contains:

                Albedo                                 %

	average and covariance for the month at the surface.  The average
	begins 3 hours after the reference time.  The month is
	referenced in the file name and encoded in the file.

CPRAT -

	Contains:

		Convective precipitation rate          kg/m**2/s

	monthly average and covariance at the surface.  The average
        begins 3 hours after the reference time.  The month is
        referenced in the file name and encoded in the file.

GFLUX -

        Contains:

                Ground heat flux                       W/m**2

        monthly average and covariance at the surface.  The average
        begins 3 hours after the reference time.  The month is
        referenced in the file name and encoded in the file.

ICEC -

	Contains:

                Ice concentration (ice=1;no ice=0)(see note) fraction

        monthly average and covariance at the surface.  The average
        begins 6 hours after the reference time.  The covariance is calculate
	beginning 3 hours after the reference time.  The month is
        referenced in the file name and encoded in the file.

LHTFL -

	Contains:

		Latent heat net flux               W/m2

	monthly average and covariance at the surface.  The average
	begins 3 hours after the reference time.  The month is
	referenced in the file name and encoded in the file.

PEVPR -

        Contains:

                Potential evaporation rate             w/m**/s

	monthly average and covariance at the surface.  The average
	begins 6 hours after the reference time.  The covariance begins
	3 hours after the reference time.  The month is referenced in
	the file name and encoded in the file.

PRATE -

        Contains:

                Precipitation rate                   kg/m2/s 

	monthly average and covariance at the surface.  The average
	begins 3 hours after the reference time.  The month is
	referenced in the file name and encoded in the file.

PWAT -

        Contains:

                Precipitable water                     kg/m2

	monthly average and covariance for the entire atmosphere
	considered as a single layer.  The month is referenced in the
	file name and encoded in the file.

SHTFL -

	Contains:

                Sensible heat net flux             W/m2

	monthly average and covariance at the surface.  The
	average begins 3 hours after the reference time in the file.
	The month is referenced in the file name and encoded in the
	file.

U-GWD -

        Contains:

                Zonal gravity wave stress              N/m**2

        average and covariance for the month at the surface.
        The average begins 3 hours after the reference time.  The month
        is referenced in the file name and encoded in the file.

UFLX -

        Contains:

                Momentum flux, u component         N/m2

        average and covariance for the month at the surface.
        The average begins 3 hours after the reference time.  The month
        is referenced in the file name and encoded in the file.

V-GWD -

        Contains:

                Meridional gravity wave stress         N/m**2

        average and covariance for the month at the surface.
        The average begins 3 hours after the reference time.  The month
        is referenced in the file name and encoded in the file.

VFLX -

        Contains:

                Momentum flux, v component         N/m2

        average and covariance for the month at the surface.
        The average begins 3 hours after the reference time.  The month
        is referenced in the file name and encoded in the file.

WEASD -

        Contains:

                Water equiv. of accum. snow depth     kg/m2

        average and covariance for the month at the surface.
        The average begins 6 hours after the reference time.  The
	covariance begins 3 hours after the reference time.  The month
        is referenced in the file name and encoded in the file.

These files are of the form NAMEclm.grib.YYMM
-----------------------------------------------------------------------

CFNLF -

        Contains:

                Cloud forcing net long wave flux       W/m**2

	average and covariance for the month for the entire atmosphere
	considered as a single layer.  The average begins 3 hours after
	the reference time.  The month is referenced in the file name
	and encoded in the file.

CFNSF -

        Contains:

                Cloud forcing net solar flux           W/m**2

	average and covariance for the month for the entire atmosphere
	considered as a single layer.  The average begins 3 hours after
	the reference time.  The month is referenced in the file name
	and encoded in the file.

TCDC - 

	Contains:

                Total cloud cover                      %

	average and covariance for the month for the entire atmosphere
	considered as a single layer.  The average begins 3 hours after
	the reference time.  The month is referenced in the file name
	and encoded in the file.

These files are of the form NAME.HHZ.grib.YYMM
-----------------------------------------------------------------------

CPRAT -
	
	Contains:

		Convective precipitation rate          kg/m**2/s

	monthly average and covariances for HHZ at the surface.  The
	average begins 3 hours after the reference time.  The month and
	reference time are referenced in the file name and encoded in
	the file.  00Z, 06Z, 12Z and 18Z are available.

PRATE -

        Contains:

                Precipitation rate                   kg/m2/s

        monthly average and covariances for HHZ at the surface.  The
        average begins 3 hours after the reference time.  The month and
        reference time are referenced in the file name and encoded in
        the file.  00Z, 06Z, 12Z and 18Z are available.

These files are of the form NAME.LEVEL.HHZ.grib.YYMM
-----------------------------------------------------------------------

SPFH -        

	Contains:

                Specific humidity                      kg/kg

        monthly average and covariance for HHZ at the specified
        pressure level.  The month and level are referenced in the file
        name and encoded in the file.  Times are 00Z, 06Z, 12Z and 18Z.
	Pressure levels are hPa = 1000, 850, and 925.

SPFH -

        Contains:

                Specific humidity                      kg/kg

	monthly average and covariance for HHZ at the specified level.
	The average begins 6 hours after the referenced time and the
	covariance begins 3 hours after the referenced time.  The month
	and level are referenced in the file name and encoded in the
	file.  Times are 00Z, 06Z, 12Z and 18Z.  Level is 2m.

TCDC -

        Contains:

                Total cloud cover                      %

        monthly average and covariance for HHZ at the specified level.
        The average begins 3 hours after the referenced time.  The month
        and level are referenced in the file name and encoded in the
        file.  Times are 00Z, 06Z, 12Z and 18Z.  Levels are low, mid, and hi.

TMP -

        Contains:

                Temperature                            deg. K

	monthly average and covariance for HHZ at the specified level.
	The average begins 6 hours and the covariance begins 3 hours
	after the referenced time.  The month and level are referenced
	in the file name and encoded in the file.  Times are 00Z, 06Z,
	12Z and 18Z.  Level is 2m.

TMP -

        Contains:

                Temperature                            deg. K

	monthly average and covariance for HHZ at the specified level.
	The month and level are referenced in the file name and
	encoded in the file.  Times are 00Z, 06Z, 12Z and 18Z.  Levels
	are 1000, 925 and 850.

UGRD - 

        Contains:

                u-component of wind                    m/s

        monthly average and covariance for HHZ at the specified level.
        The month and level are referenced in the file name and
        encoded in the file.  Times are 00Z, 06Z, 12Z and 18Z.  Levels
        are 1000, 925, 850, 700, 600, 500, 400, 300, 250, 200, 150, 100
	70, 50, 30, 20, 10

UGRD -

        Contains:

                u-component of wind                    m/s

	monthly average and covariance for HHZ at the specified level.
	The average begins 6 hours and the covariance begins 3 hours
	after the reference time in the file.  The month and level are
	referenced in the file name and encoded in the file.  Times
	are 00Z, 06Z, 12Z and 18Z.  Level is 10m.

VGRD -

        Contains:

                v-component of wind                    m/s

        monthly average and covariance for HHZ at the specified level.
        The month and level are referenced in the file name and
        encoded in the file.  Times are 00Z, 06Z, 12Z and 18Z.  Levels
        are 1000, 925, 850, 700, 600, 500, 400, 300, 250, 200, 150, 100
        70, 50, 30, 20, 10

VGRD -

        Contains:

                v-component of wind                    m/s

        monthly average and covariance for HHZ at the specified level.
        The average begins 6 hours and the covariance begins 3 hours
        after the reference time in the file.  The month and level are
        referenced in the file name and encoded in the file.  Times
        are 00Z, 06Z, 12Z and 18Z.  Level is 10m.


These files are of the form NAMEsfc.grib.YYMM
-----------------------------------------------------------------------

CFNLF -

        Contains:

                Cloud forcing net long wave flux       W/m**2

	average and covariance for the month at the surface.  The average
	begins 3 hours after the reference time.  The month is
	referenced in the file name and encoded in the file.

CFNSF -

        Contains:

                Cloud forcing net solar flux           W/m**2

        average and covariance for the month at the surface.  The average
        begins 3 hours after the reference time.  The month is
        referenced in the file name and encoded in the file.

CSDLF -

        Contains:

                Clear sky downward long wave flux      W/m**2

        average and covariance for the month at the surface.  The average
        begins 3 hours after the reference time.  The month is
        referenced in the file name and encoded in the file.

CSDSF -

        Contains:

                Clear sky downward solar flux          W/m**2

        average and covariance for the month at the surface.  The average
        begins 3 hours after the reference time.  The month is
        referenced in the file name and encoded in the file.

CSUSF -

        Contains:

                Clear sky upward solar flux            W/m**2

        average and covariance for the month at the surface.  The average
        begins 3 hours after the reference time.  The month is
        referenced in the file name and encoded in the file.

DLWRF -

	Contains:

		Downward long wave radiation flux      W/m**2

        average and covariance for the month at the surface.  The average
        begins 3 hours after the reference time.  The month is
        referenced in the file name and encoded in the file.

DSWRF -

        Contains:

                Downward solar radiation flux          W/m**2

        average and covariance for the month at the surface.  The average
        begins 3 hours after the reference time.  The month is
        referenced in the file name and encoded in the file.

NLWRS -

        Contains:

                Net long wave radiation (surface)       W/m2

        average and covariance for the month at the surface.  The average
        begins 3 hours after the reference time.  The month is
        referenced in the file name and encoded in the file.

NSWRS -

        Contains:

                Net short-wave radiation (surface)      W/m2

        average and covariance for the month at the surface.  The average
        begins 3 hours after the reference time.  The month is
        referenced in the file name and encoded in the file.

POT -

        Contains:

                Potential temperature                  deg. K

	average and covariance for the month at the surface.  The month
	is referenced in the file name and encoded in the file.

PRES -

        Contains:

                Pressure                               Pa

        average and covariance for the month at the surface.  The average
        begins 6 hours after the reference time.  The covariance begins
	3 hours after the reference time.  The month is
        referenced in the file name and encoded in the file.

RUNOF -

        Contains:

                Water runoff                      kg/m2

        average and covariance for the month at the surface.  The average
        begins 6 hours after the reference time.  The covariance begins
        3 hours after the reference time.  The month is
        referenced in the file name and encoded in the file.

TMP -

        Contains:

                Temperature                            deg. K

        average and covariance for the month at the surface.  The average
        begins 6 hours after the reference time.  The covariance begins
        3 hours after the reference time.  The month is
        referenced in the file name and encoded in the file.

ULWRF -

        Contains:

                Upward long wave radiation flux        W/m**2

        average and covariance for the month at the surface.  The average
        begins 3 hours after the reference time.  The month is
        referenced in the file name and encoded in the file.

USWRF -

        Contains:

                Upward solar radiation flux            W/m**2

        average and covariance for the month at the surface.  The average
        begins 3 hours after the reference time.  The month is
        referenced in the file name and encoded in the file.

These files are of the form NAMEtoa.grib.YYMM
-----------------------------------------------------------------------

CFNLF -

        Contains:

                Cloud forcing net long wave flux       W/m**2

	average and covariance for the month at the nominal top of the
	atmosphere.  The average begins 3 hours after the reference
	time.  The month is referenced in the file name and encoded in
	the file.

CFNSF -

        Contains:

                Cloud forcing net solar flux           W/m**2

        average and covariance for the month at the nominal top of the
        atmosphere.  The average begins 3 hours after the reference
        time.  The month is referenced in the file name and encoded in
        the file.

CSULF -

        Contains:

                Clear sky upward long wave flux        W/m**2

        average and covariance for the month at the nominal top of the
        atmosphere.  The average begins 3 hours after the reference
        time.  The month is referenced in the file name and encoded in
        the file.

CSUSF -

        Contains:

                Clear sky upward solar flux            W/m**2

        average and covariance for the month at the nominal top of the
        atmosphere.  The average begins 3 hours after the reference
        time.  The month is referenced in the file name and encoded in
        the file.

DSWRF -

        Contains:

                Downward solar radiation flux          W/m**2 

        average and covariance for the month at the nominal top of the
        atmosphere.  The average begins 3 hours after the reference
        time.  The month is referenced in the file name and encoded in
        the file.

ULWRF -

        Contains:

                Upward long wave radiation flux        W/m**2

        average and covariance for the month at the nominal top of the
        atmosphere.  The average begins 3 hours after the reference
        time.  The month is referenced in the file name and encoded in
        the file.

USWRF -

        Contains:

                Upward solar radiation flux            W/m**2

        average and covariance for the month at the nominal top of the
        atmosphere.  The average begins 3 hours after the reference
        time.  The month is referenced in the file name and encoded in

These files are of the form NAMEmsl.grib.YYMM
-----------------------------------------------------------------------

PRES -

	Contains:

		Pressure                               Pa

        average and covariance for the month at mean sea level.
        The month is referenced in the file name and encoded in
        the file.

These files are of the form NAMEhct.grib.YYMM
-----------------------------------------------------------------------

TMP -

        Contains:

                Temperature                            deg. K

        average and covariance for the month at the high cloud top level.
	The average begins 3 hours after the reference time in the file.
        The month is referenced in the file name and encoded in
        the file.

These files are of the form NAMElct.grib.YYMM
-----------------------------------------------------------------------

TMP -

        Contains:

                Temperature                            deg. K

        average and covariance for the month at the low cloud top level.
        The average begins 3 hours after the reference time in the file.
        The month is referenced in the file name and encoded in
        the file.

These files are of the form NAMEmct.grib.YYMM
-----------------------------------------------------------------------

TMP -

        Contains:

                Temperature                            deg. K

        average and covariance for the month at the mid cloud top level.
        The average begins 3 hours after the reference time in the file.
        The month is referenced in the file name and encoded in
        the file.

These files are of the form NAMEsfc.YYMM
-----------------------------------------------------------------------

POT - 

	Contains:

		Potential temperature                  deg. K

        For 0Z, 6Z, 12Z and 18Z for the entire month at the surface.
        The month and level are referenced in the file name and encoded in 
	the file.

4LFTX -
	
	Contains:

		Best (4-layer) lifted index            K

        For 0Z, 6Z, 12Z and 18Z for the entire month at the surface.
        The month and level are referenced in the file name and encoded in 
        the file.

ALBDO -

        Contains:

		Albedo                                 %

	6-hour averages for 6 hours after 0Z, 6Z, 12Z and 18Z for
	the entire month at the surface.  The month and level are
	referenced in the file name and encoded in the file.

CDCON -
	
	Contains:

		Convective cloud cover                 %

	6-hour averages for 6 hours after 0Z, 6Z, 12Z and 18Z for
	the entire month at the surface.  The month and level are
	referenced in the file name and encoded in the file.

CFNLF - 

	Contains:

                Cloud forcing net long wave flux       W/m**2

	6-hour averages for 6 hours after 0Z, 6Z, 12Z and 18Z for
	the entire month at the surface.  The month and level are
	referenced in the file name and encoded in the file.

CFNSF - 

	Contains:

		Cloud forcing net solar flux           W/m**2

	6-hour averages for 6 hours after 0Z, 6Z, 12Z and 18Z for
	the entire month at the surface.  The month and level are
	referenced in the file name and encoded in the file.

CPRAT - 

        Contains:

		Convective precipitation rate          kg/m**2/s

	6-hour averages for 6 hours after 0Z, 6Z, 12Z and 18Z for
	the entire month at the surface.  The month and level are
	referenced in the file name and encoded in the file.

CSDLF -

        Contains:

		Clear sky downward long wave flux      W/m**2

        6-hour averages for 6 hours after 0Z, 6Z, 12Z and 18Z for
        the entire month at the surface.  The month and level are
        referenced in the file name and encoded in the file.

CSDSF -

        Contains:

                Clear sky downward solar flux          W/m**2

        6-hour averages for 6 hours after 0Z, 6Z, 12Z and 18Z for
        the entire month at the surface.  The month and level are
        referenced in the file name and encoded in the file.

CSUSF -

        Contains:

                Clear sky upward solar flux            W/m**2

        6-hour averages for 6 hours after 0Z, 6Z, 12Z and 18Z for
        the entire month at the surface.  The month and level are
        referenced in the file name and encoded in the file.

DLWRF -

        Contains:

                Downward long wave radiation flux      W/m**2

        6-hour averages for 6 hours after 0Z, 6Z, 12Z and 18Z for
        the entire month at the surface.  The month and level are
        referenced in the file name and encoded in the file.

DSWRF -

        Contains:

                Downward solar radiation flux          W/m**2

        6-hour averages for 6 hours after 0Z, 6Z, 12Z and 18Z for
        the entire month at the surface.  The month and level are
        referenced in the file name and encoded in the file.

GFLUX -

        Contains:

                Ground heat flux                       W/m**2

        6-hour averages for 6 hours after 0Z, 6Z, 12Z and 18Z for
        the entire month at the surface.  The month and level are
        referenced in the file name and encoded in the file.

ICEC -

        Contains:

                Ice concentration (ice=1;no ice=0)(see note) fraction

	For 6 hours after 0Z, 6Z, 12Z and 18Z for the entire month at
	the surface.  The month and level are referenced in the file
	name and encoded in the file.

LAND -

        Contains:

                Land-sea mask

        For 6 hours after 0Z, 6Z, 12Z and 18Z for the entire month at
        the surface.  The month and level are referenced in the file
        name and encoded in the file.

LFTX -

        Contains:

                Surface lifted index                   K                

	For 0Z, 6Z, 12Z and 18Z for the entire month at the surface.
	The month and level are referenced in the file name and
	encoded in the file.

LHTFL -

        Contains:

                Latent heat net flux               W/m2

        6-hour averages for 6 hours after 0Z, 6Z, 12Z and 18Z for
        the entire month at the surface.  The month and level are
        referenced in the file name and encoded in the file.

NBDSF -

        Contains:

                Near IR beam downward solar flux       W/m**2       

        6-hour averages for 6 hours after 0Z, 6Z, 12Z and 18Z for
        the entire month at the surface.  The month and level are
        referenced in the file name and encoded in the file.

NDDSF - 

        Contains:

                Near IR diffuse downward solar flux    W/m**2       

        6-hour averages for 6 hours after 0Z, 6Z, 12Z and 18Z for
        the entire month at the surface.  The month and level are
        referenced in the file name and encoded in the file.

NLWRS - 

        Contains:

                Net long wave radiation (surface)       W/m2

        6-hour averages for 6 hours after 0Z, 6Z, 12Z and 18Z for
        the entire month at the surface.  The month and level are
        referenced in the file name and encoded in the file.

NSWRS - 

        Contains:

                Net short-wave radiation (surface)      W/m2

        6-hour averages for 6 hours after 0Z, 6Z, 12Z and 18Z for
        the entire month at the surface.  The month and level are
        referenced in the file name and encoded in the file.

PEVPR - 

        Contains:

                Potential evaporation rate             w/m**/s

	For 6 hours after 0Z, 6Z, 12Z and 18Z for the entire month at
	the surface.  The month and level are referenced in the file
	name and encoded in the file.

PRATE - 

        Contains:

                Precipitation rate                   kg/m2/s

        6-hour averages for 6 hours after 0Z, 6Z, 12Z and 18Z for
        the entire month at the surface.  The month and level are
        referenced in the file name and encoded in the file.

PRES - 

        Contains:

                Pressure                               Pa   

	For 6 hours after 0Z, 6Z, 12Z and 18Z for the entire month at
	the surface.  The month and level are referenced in the file
	name and encoded in the file.

PTEND -

        Contains:

                Pressure tendency                      Pa/s

        For 0Z, 6Z, 12Z and 18Z for the entire month at the mean sea
        level.  The month and level are referenced in the file name
        and encoded in the file.

RUNOF -

        Contains:

                Water runoff                      kg/m2

	For 6 hours after 0Z, 6Z, 12Z and 18Z for the entire month at
	the surface.  The GRIB decoder uses the variable name WAT R,
	the table use the name RUNOF.  The month and level are
	referenced in the file name and encoded in the file.

SFCR -

        Contains:

                Surface roughness                      m

	For 6 hours after 0Z, 6Z, 12Z and 18Z for the entire month at
	the surface.  The month and level are referenced in the file
	name and encoded in the file.

SHTFL -

        Contains:

                Sensible heat net flux             W/m2

        6-hour averages for 6 hours after 0Z, 6Z, 12Z and 18Z for
        the entire month at the surface.  The month and level are
        referenced in the file name and encoded in the file.
TMP -

        Contains:

                Temperature                            deg. K

        For 6 hours after 0Z, 6Z, 12Z and 18Z for the entire month at
        the surface.  The month and level are referenced in the file
        name and encoded in the file.

U-GWD -

        Contains:

                Zonal gravity wave stress              N/m**2

        6-hour averages for 6 hours after 0Z, 6Z, 12Z and 18Z for
        the entire month at the surface.  The month and level are
        referenced in the file name and encoded in the file.

UFLX -

        Contains:

                Momentum flux, u component         N/m2

        6-hour averages for 6 hours after 0Z, 6Z, 12Z and 18Z for
        the entire month at the surface.  The month and level are
        referenced in the file name and encoded in the file.

ULWRF -

        Contains:

                Upward long wave radiation flux        W/m**2

        6-hour averages for 6 hours after 0Z, 6Z, 12Z and 18Z for
        the entire month at the surface.  The month and level are
        referenced in the file name and encoded in the file.

USWRF -

        Contains:

                Upward solar radiation flux            W/m**2

        6-hour averages for 6 hours after 0Z, 6Z, 12Z and 18Z for
        the entire month at the surface.  The month and level are
        referenced in the file name and encoded in the file.

V-GWD -

        Contains:

                Meridional gravity wave stress         N/m**2

        6-hour averages for 6 hours after 0Z, 6Z, 12Z and 18Z for
        the entire month at the surface.  The month and level are
        referenced in the file name and encoded in the file.

VBDSF -

        Contains:

                Visible beam downward solar flux       W/m**2

        6-hour averages for 6 hours after 0Z, 6Z, 12Z and 18Z for
        the entire month at the surface.  The month and level are
        referenced in the file name and encoded in the file.

VDDSF - 

        Contains:

                Visible diffuse downward solar flux    W/m**2

        6-hour averages for 6 hours after 0Z, 6Z, 12Z and 18Z for
        the entire month at the surface.  The month and level are
        referenced in the file name and encoded in the file.

VFLX - 

        Contains:

                Momentum flux, v component         N/m2

        6-hour averages for 6 hours after 0Z, 6Z, 12Z and 18Z for
        the entire month at the surface.  The month and level are
        referenced in the file name and encoded in the file.

WEASD -

        Contains:

                Water equiv. of accum. snow depth     kg/m2

	For 6 hours after 0Z, 6Z, 12Z and 18Z for the entire month at
	the surface.  The month and level are referenced in the file
	name and encoded in the file.

These files are of the form NAMEclm.YYMM
-----------------------------------------------------------------------
(Note, clm is used for files with variables defined for the
entire atmosphere considered as a single layer.)


CFNLF -

	Contains:

		Cloud forcing net long wave flux       W/m**2

	6-hour averages for 6 hours after 0Z, 6Z, 12Z and 18Z for the
	entire month for the entire atmosphere considered as a single
	layer.  The month and level are referenced in the file name and
	encoded in the file.

CFNSF -

	Contains:

		Cloud forcing net solar flux           W/m**2

	6-hour averages for 6 hours after 0Z, 6Z, 12Z and 18Z for the
	entire month for the entire atmosphere considered as a single
	layer.  The month and level are referenced in the file name and
	encoded in the file.

CWORK -

        Contains:

                Cloud work function                    J/Kg

	For 6 hours after 0Z, 6Z, 12Z and 18Z for the entire month for
	the entire atmosphere considered as a single layer.  The month
	and level are referenced in the file name and encoded in the
	file.

PWAT -

        Contains:

                Precipitable water                     kg/m2

	For 0Z, 6Z, 12Z and 18Z for the entire month for the entire
	atmosphere considered as a single layer.  The month and level
	are referenced in the file name and encoded in the file.

RH -

        Contains:

                Relative humidity                      %

	For 0Z, 6Z, 12Z and 18Z for the entire month for the entire
	atmosphere considered as a single layer.  The month and level
	are referenced in the file name and encoded in the file.

TCDC -

        Contains:

                Total cloud cover                      %

	6-hour averages for 6 hours after 0Z, 6Z, 12Z and 18Z for the
	entire month for the entire atmosphere considered as a single
	layer.  The month and level are referenced in the file name and
	encoded in the file.

These files are of the form NAMEtoa.YYMM
-----------------------------------------------------------------------
CFNLF -
	
        Contains:

                Cloud forcing net long wave flux       W/m**2        

	6-hour averages for 6 hours after 0Z, 6Z, 12Z and 18Z for
	the entire month at the nominal top of the atmosphere.  The
	month and level are referenced in the file name and encoded in
	the file.

CSULF - 

        Contains:

                Clear sky upward long wave flux        W/m**2

        6-hour averages for 6 hours after 0Z, 6Z, 12Z and 18Z for
	the entire month at the nominal top of the atmosphere.  The
	month and level are referenced in the file name and encoded in
	the file.

CSUSF -

        Contains:

                Clear sky upward solar flux            W/m**2

        6-hour averages for 6 hours after 0Z, 6Z, 12Z and 18Z for
	the entire month at the nominal top of the atmosphere.  The
	month and level are referenced in the file name and encoded in
	the file.  Note the GRIB decoded called this variable SCUSF, the
	GRIB ID is 160 known as CSUSF in the table from NMC.

DSWRF -

        Contains:

                Downward solar radiation flux          W/m**2

	6-hour averages for 6 hours after 0Z, 6Z, 12Z and 18Z for the
	entire month at the nominal top of the atmosphere.  The month
	and level are referenced in the file name and encoded in the
	file.

ULWRF -

        Contains:

                Upward long wave radiation flux        W/m**2

        6-hour averages for 6 hours after 0Z, 6Z, 12Z and 18Z for the
        entire month at the nominal top of the atmosphere.  The month
        and level are referenced in the file name and encoded in the
        file.

USWRF -

        Contains:

                Upward solar radiation flux            W/m**2

        6-hour averages for 6 hours after 0Z, 6Z, 12Z and 18Z for the
        entire month at the nominal top of the atmosphere.  The month
        and level are referenced in the file name and encoded in the
        file.

These files are of the form NAMEsig.995.YYMM
-----------------------------------------------------------------------

POT - 

        Contains:

                Potential temperature                  deg. K

	For 0Z, 6Z, 12Z and 18Z for the entire month at SIGMA level 0.995.
	The month and level are referenced in the file name and
	encoded in the file.

RH -

        Contains:

                Relative humidity                      %

        For 0Z, 6Z, 12Z and 18Z for the entire month at SIGMA level 0.995.
        The month and level are referenced in the file name and
        encoded in the file.

TMP -

        Contains:

                Temperature                            deg. K

        For 0Z, 6Z, 12Z and 18Z for the entire month at SIGMA level 0.995.
        The month and level are referenced in the file name and
        encoded in the file.

UGRD -

        Contains:

                u-component of wind                    m/s

        For 0Z, 6Z, 12Z and 18Z for the entire month at SIGMA level 0.995.
        The month and level are referenced in the file name and
        encoded in the file.

VGRD -

        Contains:

                v-component of wind                    m/s

        For 0Z, 6Z, 12Z and 18Z for the entire month at SIGMA level 0.995.
        The month and level are referenced in the file name and
        encoded in the file.

VVEL -

        Contains:

                Pressure Vertical velocity            Pa/s

        For 0Z, 6Z, 12Z and 18Z for the entire month at SIGMA level 0.995.
        The month and level are referenced in the file name and
        encoded in the file.

These files are of the form NAMEhcb.YYMM
-----------------------------------------------------------------------

PRES - 

        Contains:

                Pressure                               Pa

	6-hour averages for 6 hours after 0Z, 6Z, 12Z and 18Z for the
	entire month at the high cloud bottom level.  The month and
	level are referenced in the file name and encoded in the file.

SGLYR -

        Contains:

                Nearby model level                     integer

	6-hour averages for 6 hours after 0Z, 6Z, 12Z and 18Z for the
	entire month at the high cloud bottom level.  The GRIB decoder
	refers to this variable as MLYNO.  The month and level are
	referenced in the file name and encoded in the file.

These files are of the form NAMEhct.YYMM
-----------------------------------------------------------------------
PRES - 

        Contains:

                Pressure                               Pa   

	6-hour averages for 6 hours after 0Z, 6Z, 12Z and 18Z for the
	entire month at the high cloud top level.  The month and level
	are referenced in the file name and encoded in the file.

SGLYR -

        Contains:

                Nearby model level                     integer

	6-hour averages for 6 hours after 0Z, 6Z, 12Z and 18Z for the
	entire month at the high cloud top level.  The GRIB decoder
	refers to this variable as MLYNO.  The month and level are
	referenced in the file name and and encoded in the file.

TMP -

        Contains:

                Temperature                            deg. K

	6-hour averages for 6 hours after 0Z, 6Z, 12Z and 18Z for the
	entire month at the high cloud top level.  The month and level
	are referenced in the file name and encoded in the file.

These files are of the form NAMElcb.YYMM
-----------------------------------------------------------------------
PRES - 

        Contains:

                Pressure                               Pa   

	6-hour averages for 6 hours after 0Z, 6Z, 12Z and 18Z for the
	entire month at the low cloud bottom level.  The month and
	level are referenced in the file name and encoded in the file.

SGLYR -

        Contains:

                Nearby model level                     integer

	6-hour averages for 6 hours after 0Z, 6Z, 12Z and 18Z for the
	entire month at the low cloud bottom level.  The GRIB decoder
	refers to this variable as MLYNO.  The month and level are
	referenced in the file name and and encoded in the file.

These files are of the form NAMElct.YYMM
-----------------------------------------------------------------------

PRES - 

        Contains:

                Pressure                               Pa   

	6-hour averages for 6 hours after 0Z, 6Z, 12Z and 18Z for the
	entire month at the low cloud top level.  The month and level
	are referenced in the file name and encoded in the file.

SGLYR -

        Contains:

                Nearby model level                     integer

	6-hour averages for 6 hours after 0Z, 6Z, 12Z and 18Z for the
	entire month at the low cloud top level.  The GRIB decoder
	refers to this variable as MLYNO.  The month and level are
	referenced in the file name and and encoded in the file.  TMP -

        Contains:

                Temperature                            deg. K

	6-hour averages for 6 hours after 0Z, 6Z, 12Z and 18Z for the
	entire month at the low cloud top level.  The month and level
	are referenced in the file name and encoded in the file.

These files are of the form NAMEmcb.YYMM
-----------------------------------------------------------------------

PRES - 

        Contains:

                Pressure                               Pa   

	6-hour averages for 6 hours after 0Z, 6Z, 12Z and 18Z for the
	entire month at the middle cloud bottom level.  The month and
	level are referenced in the file name and encoded in the file.

SGLYR -

        Contains:

                Nearby model level                     integer

	6-hour averages for 6 hours after 0Z, 6Z, 12Z and 18Z for the
	entire month at the level middle cloud bottom level.  The GRIB
	decoder refers to this variable as MLYNO.  The month and level
	are referenced in the file name and and encoded in the file.

These files are of the form NAMEmct.YYMM
-----------------------------------------------------------------------

PRES - 

        Contains:

                Pressure                               Pa   

	6-hour averages for 6 hours after 0Z, 6Z, 12Z and 18Z for the
	entire month at the middle cloud top level.  The month and
	level are referenced in the file name and encoded in the file.

SGLYR -

        Contains:

                Nearby model level                     integer

	6-hour averages for 6 hours after 0Z, 6Z, 12Z and 18Z for the
	entire month at the middle cloud top level.  The GRIB decoder
	refers to this variable as MLYNO.  The month and level are
	referenced in the file name and and encoded in the file.

TMP -

        Contains:

                Temperature                            deg. K

	6-hour averages for 6 hours after 0Z, 6Z, 12Z and 18Z for the
	entire month at the middle cloud top level.  The month and
	level are referenced in the file name and encoded in the file.

These files are of the form NAMEmsl.YYMM
-----------------------------------------------------------------------

PRES - 

        Contains:

                Pressure                               Pa   

	6-hour averages for 6 hours after 0Z, 6Z, 12Z and 18Z for the
	entire month at the low cloud bottom level.  The month and
	level are referenced in the file name and encoded in the file.

PRMSL -

        Contains:

                Pressure reduced to MSL                Pa

        For 0Z, 6Z, 12Z and 18Z for the entire month at the mean sea
        level.  The month and level are referenced in the file name
        and encoded in the file.

These files are of the form NAMEmwl.YYMM
-----------------------------------------------------------------------

PRES - 

        Contains:

                Pressure                               Pa   

	For 0Z, 6Z, 12Z and 18Z for the entire month at the maximum
	wind speed level.  The month and level are referenced in the
	file name and encoded in the file.

TMP -

        Contains:

                Temperature                            deg. K

        For 0Z, 6Z, 12Z and 18Z for the entire month at the maximum
        wind speed level.  The month and level are referenced in the
        file name and encoded in the file.

UGRD -

        Contains:

                u-component of wind                    m/s

        For 0Z, 6Z, 12Z and 18Z for the entire month at the maximum
        wind speed level.  The month and level are referenced in the
        file name and encoded in the file.

VGRD -

        Contains:

                v-component of wind                    m/s

        For 0Z, 6Z, 12Z and 18Z for the entire month at the maximum
        wind speed level.  The month and level are referenced in the
        file name and encoded in the file.

These files are of the form NAMEtrp.YYMM
-----------------------------------------------------------------------

PRES - 

        Contains:

                Pressure                               Pa   

	For 0Z, 6Z, 12Z and 18Z for the entire month at the tropopause
	level.  The month and level are referenced in the file name
	and encoded in the file.

TMP -

        Contains:

                Temperature                            deg. K

        For 0Z, 6Z, 12Z and 18Z for the entire month at the tropopause
        level.  The month and level are referenced in the file name
        and encoded in the file.

UGRD -

        Contains:

                u-component of wind                    m/s

        For 0Z, 6Z, 12Z and 18Z for the entire month at the tropopause
        level.  The month and level are referenced in the file name
        and encoded in the file.

VGRD -

        Contains:

                v-component of wind                    m/s

        For 0Z, 6Z, 12Z and 18Z for the entire month at the tropopause
        level.  The month and level are referenced in the file name
        and encoded in the file.

VSSH -

        Contains:

                Vertical speed shear                   1/s

        For 0Z, 6Z, 12Z and 18Z for the entire month at the tropopause
        level.  The month and level are referenced in the file name
        and encoded in the file.

These files are of the form NAMEplg.0.YYMM
-----------------------------------------------------------------------

RH -

        Contains:

                Relative humidity                      %

	For 0Z, 6Z, 12Z and 18Z for the entire month between two levels
	of specified pressure from ground to levels (30 and 0 in this
	case).  The month and level are referenced in the file name
	and encoded in the file.

TMP -

        Contains:

                Temperature                            deg. K

        For 0Z, 6Z, 12Z and 18Z for the entire month between two levels
        of specified pressure from ground to levels (30 and 0 in this
        case).  The month and level are referenced in the file name
        and encoded in the file.

UGRD -

        Contains:

                u-component of wind                    m/s

        For 0Z, 6Z, 12Z and 18Z for the entire month between two levels
        of specified pressure from ground to levels (30 and 0 in this
        case).  The month and level are referenced in the file name
        and encoded in the file.

VGRD -

        Contains:

                v-component of wind                    m/s

        For 0Z, 6Z, 12Z and 18Z for the entire month between two levels
        of specified pressure from ground to levels (30 and 0 in this
        case).  The month and level are referenced in the file name
        and encoded in the file.

These files are of the form NAMEslr.LEVEL.YYMM
-----------------------------------------------------------------------

RHslr.1 -

        Contains:

                Relative humidity                      %            

	For 0Z, 6Z, 12Z and 18Z for the entire month between two SIGMA
	levels.  (44/100 and 100/100 in this case).  The month and
	level are referenced in the file name and encoded in the
	file.


RHslr.720 -

        Contains:

                Relative humidity                      %            

        For 0Z, 6Z, 12Z and 18Z for the entire month between two SIGMA
        levels.  (44/100 and 72/100 in this case).  The month and
        level are referenced in the file name and encoded in the
        file.


RHslr.940 - 

        Contains:

                Relative humidity                      %            

        For 0Z, 6Z, 12Z and 18Z for the entire month between two SIGMA
        levels.  (72/100 and 94/100 in this case).  The month and
        level are referenced in the file name and encoded in the
        file.

These files are of the form NAMEdlr.LEVEL.YYMM
-----------------------------------------------------------------------

SOILWdlr.10 -

        Contains:

                Volumetric soil moisture content       fraction

        For 6 hours after 0Z, 6Z, 12Z and 18Z for the entire month between
        0 and 10 cm.  The month and level are referenced in the file
        name and encoded in the file.

SOILWdlr.200 -

        Contains:

                Volumetric soil moisture content       fraction

        For 6 hours after 0Z, 6Z, 12Z and 18Z for the entire month between
        10 and 200 cm.  The month and level are referenced in the file
        name and encoded in the file.

TMPdlr.10 -

        Contains:

                Temperature                            deg. K

        For 6 hours after 0Z, 6Z, 12Z and 18Z for the entire month between
        0 and 10 cm.  The month and level are referenced in the file
        name and encoded in the file.

TMPdlr.200 -

        Contains:

                Temperature                            deg. K  

        For 6 hours after 0Z, 6Z, 12Z and 18Z for the entire month between
        10 and 200 cm.  The month and level are referenced in the file
        name and encoded in the file.

These files are of the form NAMEhag.LEVEL.YYMM
-----------------------------------------------------------------------

SPFHhag.2 -

        Contains:

                Specific humidity                      kg/kg

        For 6 hours after 0Z, 6Z, 12Z and 18Z for the entire month at
        2 m.  The month and level are referenced in the file
        name and encoded in the file.

TMAXhag.2 -

        Contains:

                Maximum temperature                    deg. K

        For 6 hours after 0Z, 6Z, 12Z and 18Z for the entire month at
        2 m.  The month and level are referenced in the file
        name and encoded in the file.

TMINhag.2 -

        Contains:

                Minimum temperature                    deg. K

        For 6 hours after 0Z, 6Z, 12Z and 18Z for the entire month at
        2 m.  The month and level are referenced in the file
        name and encoded in the file.

TMPhag.2 -

        Contains:

                Temperature                            deg. K

        For 6 hours after 0Z, 6Z, 12Z and 18Z for the entire month at
        2 m.  The month and level are referenced in the file
        name and encoded in the file.

UGRDhag.10 -

        Contains:

                u-component of wind                    m/s

        For 6 hours after 0Z, 6Z, 12Z and 18Z for the entire month at
        10 m.  The month and level are referenced in the file
        name and encoded in the file.

VGRDhag.10 -

        Contains:

                v-component of wind                    m/s

        For 6 hours after 0Z, 6Z, 12Z and 18Z for the entire month at
        10 m.  The month and level are referenced in the file
        name and encoded in the file.

These files are of the form NAMEhcl.YYMM
-----------------------------------------------------------------------

TCDC -

        Contains:

                Total cloud cover                      %

	6-hour averages for 6 hours after 0Z, 6Z, 12Z and 18Z for the
	entire month at the high cloud level.  This level is not defined in
	the GRIB guide, it has a value of 234 and name LCY according
	the GRIB decoder.  The month and level are referenced in the
	file name and encoded in the file.

These files are of the form NAMElcl.YYMM
-----------------------------------------------------------------------

TCDC -

        Contains:

                Total cloud cover                      %

        6-hour averages for 6 hours after 0Z, 6Z, 12Z and 18Z for the
        entire month at the low cloud level.  This level is not defined in
        the GRIB guide, it has a value of 214 and name LCY according
        the GRIB decoder.  The month and level are referenced in the
        file name and encoded in the file.

These files are of the form NAMEmcl.YYMM
-----------------------------------------------------------------------

TCDC -

        Contains:

                Total cloud cover                      %

        6-hour averages for 6 hours after 0Z, 6Z, 12Z and 18Z for the
        entire month at the middle cloud level.  This level is not defined in
        the GRIB guide, it has a value of 234 and name LCY according
        the GRIB decoder.  The month and level are referenced in the
        file name and encoded in the file.

These files are of the form NAMEdpl.LEVEL.YYMM
-----------------------------------------------------------------------

TMPdpl.300 -

        Contains:

                Temperature                            deg. K  

        For 6 hours after 0Z, 6Z, 12Z and 18Z for the entire month at
        300 cm.  The month and level are referenced in the file
        name and encoded in the file.