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Hi Allan- Our main GEMPAK support person (Michael James) is out for a couple of weeks, so I'll do my best to help you out. > Full Name: Allan Huffman > Email Address: address@hidden > Organization: none > Package Version: > Operating System: > Hardware: > Description of problem: > > Hi, I am trying to write 80 meter winds interpolated from a nam218 grib > file to a new grib file using gdgrib2. > > I have taken the nam218 gribfile and have ran gdvint to interpolate 80m > winds. But now I would like to take this gempak file and write the 80 m > winds back to a new grib file. > > I assume I should use gdgrib or gdgrib2, but I am not sure how to > proceed from there. Any advice? Thanks. I think you could use either program, but gdgrib2 is probably better. You'll probably have to run this a couple of times because it looks like gfunc only takes one parameter at a time. Taking the defaults for the grib2 parameters should probably work. Don Murray Ticket Details =================== Ticket ID: RIR-544234 Department: Support GEMPAK Priority: Normal Status: Open