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Global Forecast System (GFS)
The global numerical weather prediction computer model run by NOAA. It is run four times a day and delivers forecasts up to 16 days in advance. Beyond 7 days, the forecast is not very accurate.
Integrated Forecast System (IFS)
The operational global meteorological forecasting model run by the European Centre for Medium-Range Weather Forecasts (ECMWF), based in Reading, England. It is run every twelve hours and delivers forecasts up to 10 days in advance. The operational model runs both in a deterministic forecast mode and as a 51-member ensemble.
North American Mesoscale Model (NAM)
A numerical weather prediction model run by the National Centers for Environmental Prediction (NCEP) for short-term weather forecasting. Currently, the Weather Research and Forecasting Non-hydrostatic Mesoscale Model (WRF-NMM) is run as NAM. It is run four times a day and delivers forecasts up to 84 hours in advance. Provides finer detail than other operational forecast models.
Weather Research and Forecasting (WRF)
A numerical program model used for forecasting and research. Adopted by meteorological services worldwide. Embeds a specialized Hurricane version (HWRF) and shows highly detailed forecasts in a four-kilometre range.
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