The NCEP Climate Forecast System version 2 (CFSv2) in raw form is run as a 4-member ensemble 4 times per day. Typically, this is turned into a time-lagged 16-member ensemble, i.e. today’s 00Z initialisations are combined with the 06, 12, and 18Z initialisations from yesterday.

Following the style used in the S2S database, the forecasts shown here run out to 44 days.