Table4.2.0.191 https://www.nco.ncep.noaa.gov/pmb/docs/grib2/grib2_doc/grib2_table4-2-0-191.shtml TSEC Seconds prior to initial reference time (defined in Section 1) s GEOLAT Geographical Latitude N GEOLON Geographical Longitude E DSLOBS Days Since Last Observation d NLAT Latitude (-90 to 90) ELON East Longitude (0 to 360) RTSEC Seconds prior to initial reference time s MLYNO Model Layer number (From bottom up) NLATN Latitude (nearest neighbor) (-90 to 90) ELONN East Longitude (nearest neighbor) (0 to 360)