Table4.2.3.4 https://www.nco.ncep.noaa.gov/pmb/docs/grib2/grib2_doc/grib2_table4-2-3-4.shtml VOLAPROB Volcanic Ash Probability % VOLACDTT Volcanic Ash Cloud Top Temperature K VOLACDTP Volcanic Ash Cloud Top Pressure Pa VOLACDTH Volcanic Ash Cloud Top Height m VOLACDEM Volcanic Ash Cloud Emissity Numeric VOLAEADR Volcanic Ash Effective Absorption Depth Ratio Numeric VOLACDOD Volcanic Ash Cloud Optical Depth Numeric VOLACDEN Volcanic Ash Column Density kg m-2 VOLAPER Volcanic Ash Particle Effective Radius m