Brian, If you want to send me the grib file, I'll take a look. The surface topography is generated from a PRES@0%none field, but I don't think that is a problem. The odd feature is that you seem to have a contour even though CTYPE=f and not f/c. One note I also found is that you have not set PANEL, which is one reason I wondered if you were doing some overlay unintentionally. Steve Chiswell Unidata User Support Ticket Details =================== Ticket ID: FYS-891494 Department: Support GEMPAK Priority: Normal Status: Closed