From wikipedia:

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GRIB (GRIdded Binary or General Regularly-distributed Information in Binary form) is a concise data format commonly used in meteorology to store historical and forecast weather data. It is standardized by the World Meteorological Organization's Commission for Basic Systems, known under number GRIB FM 92-IX, described in WMO Manual on Codes No.306. Currently there are three versions of GRIB. Version 0 was used to a limited extent by projects such as TOGA, and is no longer in operational use. The first edition (current sub-version is 2) is used operationally worldwide by most meteorological centers, for Numerical Weather Prediction output (NWP). A newer generation has been introduced, known as GRIB second edition, and data is slowly changing over to this format. Some of the second-generation GRIB are used for derived product distributed in Eumetcast of Meteosat Second Generation. Another example is the NAM (North American Mesoscale) model.

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GRIB2 is the second version of the  WMO standard for distributing gridded data.  It is described in the WMO GRIB2 Document FM92-X11 GRIB. (see: NCEP WMO GRIB2 Documentation, provided by the National Centers for Environmental Prediction (NCEP), it has complete tables, but is missing the notes and regulations.)

 

For information About NDFD GRIB Decoding(DeGRIB) click here.

DeGRIB

The DeGRIB Links page provides links to various additional GRIB resources.

For further information about DeGRIB, please contact Michael.Allard-Lang@noaa.gov and Arthur.Taylor@noaa.gov.