The National Centers for Environmental Prediction (NCEP)'s Global Ensemble Forecast System (GEFS) is the cornerstone of NCEP’s operational production suite of numerical guidance. NCEP’s global forecasts provide deterministic and probabilistic guidance out to 16 days. The GEFS provides initial and/or boundary conditions for NCEP’s other models for regional, ocean, and wave prediction systems. The Environmental Modeling Center (EMC) is responsible for the enhancements, transitions-to-operations, and maintenance of the GEFS. The global data assimilation and forecasts are made four times daily at 0000, 0600, 1200 and 1800 UTC by NCEP Central Operations (NCO). More documentation about the GEFS can be found here.
The current operational version of the GEFS is version 12.3 as of 2022 October 19. The service change notice can be found here. Verification for the operational GEFS and other operational global models can be found by navigating the links to the left.
Verification is done using the EMC Verification System (EVS), which uses METplus.