Pacific North American Index (PNA) from the NOAA/CPC
This mode describes low frequency variability of the Northern Hemisphere extratropics.
Correlation of JFM 500mb geopotential height with the PNA index.
WRIT Time-series
Description
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This mode describes low frequency variability of the Northern Hemisphere extratropics. A positive PNA is associated with in ceased heights over the inter-mountain region of the US and low heights in the SE and off the Aleutian islands. A positive PNA is often associated with an El Ni˜o and a negative one with a La Ni˜na.
Temporal Coverage
- Monthly values: 1950 to present
- Update Status: Static
Data Notes
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Units: mb
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Time-series List
Source, citation and related Information.
Related Time-series
Links
Original Source
- Data is from the NOAA CPC
Time-series source dataset(s)
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Input data for the mode calculation is the NCEP/NCAR Reanalysis.
Citation
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Barnston, A. G., and R. E. Livezey, 1987: Classification, seasonality and persistence of low-frequency atmospheric circulation patterns. Mon. Wea. Rev., 115, 1083-1126.
References
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Barnston, A. G., and R. E. Livezey, 1987: Classification, seasonality and persistence of low-frequency atmospheric circulation patterns. Mon. Wea. Rev., 115, 1083-1126.