Global Forecast System

An example of a forecast product from the GFS, in this case a 96-hour forecast of 850 mb geopotential height and temperature

The Global Forecast System (GFS) is a global numerical weather prediction system operated by the National Centers for Environmental Prediction (NCEP), part of the United States National Weather Service. It produces forecasts of atmospheric and land-surface conditions, including temperature, wind, precipitation, soil moisture, and atmospheric composition.

The deterministic GFS forecast is run four times each day and covers out to 16 days in the future. The system also provides initial conditions and forecast information used by other National Weather Service prediction systems.

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