netcdf grbfull/files/2021041800/rh_2021041800_ISM.grb {
  dimensions:
    lon = 401;
    lat = 321;
    time = 82;
    isobaric = 17;
  variables:
    int LatLon_Projection;
      :grid_mapping_name = "latitude_longitude";
      :earth_radius = 6371229.0; // double

    float lat(lat=321);
      :units = "degrees_north";

    float lon(lon=401);
      :units = "degrees_east";

    double reftime;
      :units = "Hour since 2021-04-18T00:00:00Z";
      :standard_name = "forecast_reference_time";
      :long_name = "GRIB reference time";
      :calendar = "proleptic_gregorian";

    double time(time=82);
      :units = "Hour since 2021-04-18T00:00:00Z";
      :standard_name = "time";
      :long_name = "GRIB forecast or observation time";
      :calendar = "proleptic_gregorian";

    float isobaric(isobaric=17);
      :units = "Pa";
      :long_name = "Isobaric surface";
      :positive = "down";
      :Grib_level_type = 100; // int

    float Relative_humidity_isobaric(time=82, isobaric=17, lat=321, lon=401);
      :long_name = "Relative humidity @ Isobaric surface";
      :units = "%";
      :abbreviation = "RH";
      :missing_value = NaNf; // float
      :grid_mapping = "LatLon_Projection";
      :coordinates = "reftime time isobaric lat lon ";
      :Grib_Variable_Id = "VAR_0-1-1_L100";
      :Grib2_Parameter = 0, 1, 1; // int
      :Grib2_Parameter_Discipline = "Meteorological products";
      :Grib2_Parameter_Category = "Moisture";
      :Grib2_Parameter_Name = "Relative humidity";
      :Grib2_Level_Type = 100; // int
      :Grib2_Level_Desc = "Isobaric surface";
      :Grib2_Generating_Process_Type = "Forecast";

  // global attributes:
  :Originating_or_generating_Center = "US National Weather Service, National Centres for Environmental Prediction (NCEP)";
  :Originating_or_generating_Subcenter = "0";
  :GRIB_table_version = "2,1";
  :Type_of_generating_process = "Forecast";
  :Analysis_or_forecast_generating_process_identifier_defined_by_originating_centre = "Analysis from GFS (Global Forecast System)";
  :file_format = "GRIB-2";
  :Conventions = "CF-1.6";
  :history = "Read using CDM IOSP GribCollection v3";
  :featureType = "GRID";
}