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Hans, The problem was the grib 1 files were missing the parameter tables, so I configured tables for Tropical Prediction Center (NHC), Miami (RSMC) that's center 52 sub center 0 and table version 2 With the new configuration the grib 1 files can be read. The grib 2 files are a different problem, the data providers are using product definition 9 with inconsistent values so the forecast time is coming out -9999. They are also using Local Use definitions so I don't know if this problem can be solved until these discrepancies can be addressed by the data provider. Robb... Ticket Details =================== Ticket ID: OFG-746816 Department: Support netCDF Decoders Priority: Critical Status: Open