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Kimberly, The first question I have to ask is if you have added an entry for this "TFP" parameter in ncepgrib129.tbl? Do you see any GDGRIB errors reported such as: [GDGRIB -83] Cannot find parameter in tables Lastly, it would help if you could upload the .gem file you're using to the RAMADDA repository located at http://motherlode.ucar.edu/repository/alias/gempakuploads/ that way I can play around with GDGRIB on my end and see what I can find. Best, Michael James Unidata > Full Name: Kimberly Hoogewind > Email Address: address@hidden > Organization: Purdue University > Package Version: 5.11.1 > Operating System: > Hardware: > Description of problem: Hello, > > I am having an issue with gdgrib writing out an empty grib file. I've > calculated a rather complex parameter and stored it back into my original > .gem file using gddiag. This was successful as I was able to plot the > parameter as well as see the values at each grid point using gdlist. For some > reason, though, gdgrib just does not work for this parameter (my program > input is listed below). It does, however, seem to work when I use a function > such as TMPF or HGHT at a certain level. Could this be due to some grid > points containing missing data for my calculated parameter(-9999.0)? > > Any advice would be very much appreciated! > > Thanks! > > Kim > > > file=$1 > > $GEMEXE/gdgrib<<EOF > > GDFILE = $file.gem > GFUNC = TFP > GDATTIM = F00 > GLEVEL = 700:1000 > GVCORD = pres > GBTBLS = ncepgrib129.tbl > GBFILE = $file-NEW.grb > VERCEN = 129/7/0/0 > PDSVAL = 223 > PRECSN = d/6 > WMOHDR = > CPYFIL = $file.gem > PROJ = > GRDAREA = > KXKY = > r > > EOF > > > Ticket Details =================== Ticket ID: XCU-941477 Department: Support GEMPAK Priority: Normal Status: Open