A World of Weather
Fundamentals of Meteorology

Ensemble Prediction System

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An ensemble prediction system (EPS) is the generic term given to a model and all of its ensemble members.  The GEFS, for example, is an ensemble prediction system based on the GFS model.

An ensemble prediction system is sometimes based on two or more models.  In this context, an ensemble prediction system is the generic term that collectively refers to all of the models and all of their respective ensemble members.