Time series of seasonal mean anomaly correlations of 500-hPa heights for
GFS,ECMWF,UKMO,FNMOC,Canada and the CDAS frozen model from 1985 to present.
Seasons are three-month non-overlapping averages, Mar-Apr-May etc.
Northern Hemisphere(1st four panels), Southern Hemisphere(next four).
Shaded bars are differences: EC-GFS in first 8 panels, GFS-UKMO in second
set of 8; GFS-CDAS in third set of 8. For high-resolution maps, click
NH and SH.