The building maintenance scheduled for Friday February 27th at 5:00pm MST has been postponed until 5:00pm March 6th. PSD's website will be down during the maintenance.
We have transitioned the data files from netCDF3 to netCDF4-classic format (transition date: Aug 14th).
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
- 11/22/1954, 1/29/1952, 11/19,1954. 11/23/1954, 2/15/1954
- Map projection: PNA