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I am trying to get data from the NAM-NMM Dataset and am having a lot of trouble getting the data I want out of the grb2 files. How can I get a CSV file containing information like Probability of precipitation, Probability of freezing precipitation, TMAX, TMIN, etc... plus time of forecast for all latitudes and longitudes.

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Use wgrib2. This has a command line switch to get output as csv file. This should be simple like this:-

wgrib2 -match "TMAX" -match "800 mb" /path/to/file.grib2 -csv name.csv
  • This is what I ended up using – bs7280 Oct 18 '17 at 19:09

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