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NAM MOS Products (MET)

The NAM-Based MOS guidance is generated from 0000 UTC and 1200 UTC model output from the Environmental Modeling Center's NAM Model. This guidance is valid for stations in the Continental United States, Alaska, Hawaii, Puerto Rico, and the U.S. Virgin Islands. Forecast elements are valid from 6 to 72 hours in advance.

Note to users:

MOS products are no longer being developed as stand-alone products, and we are considering gradually phasing them out in the next couple of years (this does not include LAMP and GLMP products). We encourage MOS users to switch to the National Blend of Models. Information about the NBM can be found at, and NBM text bulletins can be accessed via webpage at

Data Download

Full Text Message

MEX Full Text Messages will be available in the following FTP directory, in the following directory/files:
nam_mos.YYYYMMDD/mdl_nammet.tCCz, where YYYYMMDD is the run datestamp, and CC is the cycle.

Data Product Region Format URL
MET Full Text Messages all Text

Other Data Products

Messages can be found on NWS FTP Server (TGFTP). On this server, GRIB files are stored in directories called RD.YYYYMMDD, where YYYYMMDD is the year, month and day. Within the RD.YYYYMMDD directory, the files will be named cy.XX.txt, where XX is the cycle. These data will be available for two days.

Data Product Region Format URL
MET Raw Data (General Suite) CONUS GRIB
MET Raw Data (Severe Weather) CONUS GRIB

MAV graphical forecasts were discontinued December, 2019. Users are encouraged to use the NBM quick-look images instead: