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  We have transitioned the data files from netCDF3 to netCDF4-classic format. As a result, the files are compressed instead of being packed with a scale and offset. As with any netCDF4 file, the user interface will perform the uncompression. We expect the files to be read faster, depending on the application you are using. Please let us know if you run into any issues.

20th Century Reanalysis

This plot shows the anomalous 500mb geopotential height over the North American Region for the 5 highest PNA index days in the 1950's.

Options to produce plot are using the Daily 20th Century Plotting page

  • geopotential height
  • 500mb
  • 11/22/1954, 1/29/1952, 11/19,1954. 11/23/1954, 2/15/1954
  • Anomalies
  • Map projection: PNA