John, Don't worry about the UnknownDiscipline 255 warnings. The NCEP folks sometimes put data products in the models without any parameter information, the Grib library use to ignore it but I wanted to keep tabs on the data so there's some code to catch it. Personally I think it's just experimental data that will be released in the future. It doesn't slow down any processing. Robb... Ticket Details =================== Ticket ID: JWP-203215 Department: Support netCDF Java Priority: Normal Status: Open