Attention users: Dissemination of all Gridded Model Output Statistics (GMOS) products is planned to be terminated on or about Tuesday, November 5, 2019, after the 1200 UTC model cycle time. More information can be found at Service Change Notification 19-28


Gridded MOS is an expansion of the Model Output Statistics technique used to improve numerical model forecasts by relating model outputs to observations via statistical methods. In Gridded MOS, MOS output calculated for meteorological ground station locations (see: GFS MOS,NAM MOS) are applied to a grid, such as that used by the National Digital Forecast Database. This application is done using a Bergthorssen-Doos-Cressman analysis technique, modified by Glahn. 

MDL produces a number of operational and experimental products which provide guidance about determenistic (observable) meteorological variables (temperature, dew point, QPF, etc.), and general weather characteristics (predominant weather type, precipitation type). MDL also produces probabilistic products, such as percent chance of severe weather or percent chance of snowfall occurring.

For more details about the Gridded MOS techniques, please see our About GMOS page; additional information about specific products can be found on product pages. 

GMOS Products

Note:  While we are transitioning our web pages, products marked with an (*) link to product pages on the old system. Products on those pages are up-to-date, but links on those pages may go to old information or may be broken. Thank you for your patience!

Operational (and Transitional) Products

Operational products are fully supported by NWS and are produced on a regular schedule by NCEP Central Operations.


Experimental Products

Experimental products are still in development. They are produced and supported by the developers. These products may not be produced on a regular schedule. Comments and Suggestions are always welcome.