We have transitioned the data files from netCDF3 to netCDF4-classic format (transition date: Aug 14th).
20th Century Reanalysis
Plot shows the NAO pattern with the anomalous 850mb zonal wind dipole over the eastern NH Atlantic ocean.
Options to produce plot are using the Monthly/seasonal 20th Century Plotting page: Google Earth
- variable=zonal wind
- use timeseries
- standardized values greater than 1 sigma