Forecasts of 500mb Height Teleconnection Indices, from ESRL/PSL GEFS Reforecast2 Data
Note: As of 23 September 2020, the Global Ensemble Forecast System has been upgraded to a much improved version 12, and this page is now obsolete. New reforecasts are available via Amazon Web Services for free download, at https://noaa-gefs-retrospective.s3.amazonaws.com/index.html, and you are directed there for data access. It is straightforward to set up scripts to loop over days and members and download sequences of global fields using wget or curl. The experimental forecast product pages that we have developed based on the previous model version and reforecasts will not be updated; we have not received any resources for updating them, regrettably. If you have questions or comments about this dataset or the associated products, please contact: firstname.lastname@example.org
The PNA, NAO, WPO and EPO indices represent four patterns of low-frequency tropospheric height variability, as classified in the study of Barnston and Livezey (MWR, 1987). The indices are based on centers-of-action of 500mb height patterns as defined below. The calculation of these teleconnection indices utilize the mean of the 11-member ESRL/PSL GEFS reforecast2 ensemble forecasts, initialized daily at 00 UTC. The height fields are spectrally truncated to total wavenumber 10 in order to emphasize large_scale variations.
These forecasts will usually (but not always) be updated by 16 UTC each day. They likely will not be available as consistently as operational products from the National Weather Service. Also please note that this is an experimental forecast product, and is not an official forecast of NOAA or its National Weather Service.
We welcome feedback on this product. Email comments to: email@example.com .
Latest Forecasts of Teleconnection Indices
Daily Forecasts of Teleconnection Indices for Last 120 Days
- Pacific North America Pattern (PNA) [(15-25N, 180-140W)-(40-50N, 180-140W)+(45-60N, 125W-105W)-(25-35N, 90W-70W)]
- North Atlantic Oscillation(NAO) [(35-45N, 70W-10W) - (55-70N, 70W-10W)]
- Western Pacific Oscillation(WPO) [(25-40N, 140E-150W) - (50-70N, 140E-150W)]
- Eastern Pacific Oscillation(EPO) [(20-35N, 160W-125W) - (55-65N, 160W-125W)]
Daily forecasts of teleconnection indices produced at NCEP's Climate Prediction Center can be found here.
Daily Teleconnection Indices: Historical Values from NCAR/NCEP Reanalysis
The NAO, PNA, WPO and EPO daily indices are available from 1948 onwards and are updated regularily. The data used in computing these teleconnection patterns are from the daily averaged NCAR/NCEP Reanalysis. The 1981-2010 period was used as climatology.
This is a Research and Development Application