Data coverage
Update Effective October 14, 2026, the NAM will be replaced by the Rapid Refresh Forecast System (RRFS). A full list of the models and products being retired can be found in the following Service Change Notice. The retirement of NAM and the production implementation of RRFS and the RRFS Ensemble Forecast System (REFS) will occur on the same day. Production files of RRFS and REFS can be accessed through the operational bucket for these models. Please check back here and monitor NWS's Service Change Notices for the latest updates as the implementation date nears. --- The North American Mesoscale Forecast System (NAM) is one of the National Centers For Environmental Prediction’s (NCEP) major models for producing weather forecasts. NAM generates multiple grids (or domains) of weather forecasts over the North American continent at various horizontal resolutions. Each grid contains data for dozens of weather parameters, including temperature, precipitation, lightning, and turbulent kinetic energy. NAM uses additional numerical weather models to generate high-resolution forecasts over fixed regions, and occasionally to follow significant weather events like hurricanes.
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