The Climate Forecast System or coupled forecast system (CFS) is a medium to long range numerical weather prediction and a climate model run by the National Centers for Environmental Prediction (NCEP) to bridge weather and climate timescales.
The shorter scale has some overlap with the Global Forecast System, NAVGEM and FIM models (among several other medium-range models) that the US government runs for operational forecast purposes.
Its forecasts are derived from a 16-member ensemble, with each member initialized on a lead of several days of conditions.
The CFSv2 offers output that can be masked to suppress forecasts made with insufficient skill.
[clarification needed] Among the variables made available to the public include precipitation and surface temperature (both of which are available both on a global spatial scale and a continental one), winds at 200 and 850 hectopascals (hPa), and heights at 500 hPa (all of which are available only at the global or hemispheric scale).