The site displays verification statistics for global NWP forecasts. All data used are on the GRIB G2 (2.5x2.5 degree) grid.
The NWP models evaluated are: GFS: The U.S. NCEP Global Forecast System; FNO: The U.S. Navy Fleet Numerical Meteorology and Oceanograpy Center; ECM: European Center for Medium-Range Weather Forecasts; UKM: The United Kingdom Met Office; CMC: The Canadian Meteorological Center; JMA: Japan Meteorological Agency; CDAS: The frozen version of GFS used for the NCEP/NCAR Reanalysis Project.
The regions referred to are: G2 (GLB): Globe NHX: 20N-80N SHX: 20S-80S TRO: 20S-20N
Pattern correlations for all NWP models are computed using anomalies respective to a 30-year (1959-1988) climatology of the NCEP/NCAR reanalysis.
Please see this presentation for definitions of the various verification statistics.