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Greg, Something is missing here, I downloaded one of the ensprod files you mentioned. It didn't have accumulated precipitation. The NCEP Grib2 parameter table we use is at: http://www.nco.ncep.noaa.gov/pmb/docs/grib2/grib2_table4-2-0-1.shtml I don't see any reference to accumulated Precipitation any where in the table but one of my cohorts did say he saw it in a data file at one time. But it does have parameter 8 Total Precipitation kg m-2 A PCP Either there is a discrepancy in the Grib2 table on names or there is a newer table available that I'm not aware of. I'll look at an ensprod_biasc file too. Robb... Ticket Details =================== Ticket ID: WZI-324925 Department: Support THREDDS Priority: High Status: Open