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VAPOR has it own internal data model and NWP data has to be converted into the VAPOR format. There are a set of command line tools that can convert NetCDF input data into the VAPOR format but there is no such tool available for GRIB.
Metview's s VAPOR Prepare icon helps to overcome this difficulty and allows converting ECMWF GRIB data into the VAPOR format. Detailed instructions on how to use this icon can be found here.
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