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Global Ensemble Forecast System (GEFS): The US national weather model developed and operated by the National Centers for Environmental Prediction (NCEP), which is made up of 21 separate forecasts, or ensemble members.
European Centre for Medium-Range Weather Forecasts (ECMWF) Ensemble Prediction System (EPS): The European weather model developed and operated by ECMWF, which is made up of 51 separate forecasts, or ensemble members.