Brian, I took the file 081430240.gr2 and decoded it into a gempak grid file with dcgrib2 cross.gem < 081430240.gr2 then in GDGROSS: CXSTNS = 40.495;-107.522>42.065;-104.153 GDATTIM = LAST GVCORD = PRES GFUNC = tmpc GVECT = GDFILE = cross.gem WIND = REFVEC = PTYPE = LOG YAXIS = IJSKIP = CINT = 0 SCALE = 999 LINE = 3 BORDER = 1 TITLE = 1 CLEAR = YES DEVICE = gif|test.gif TEXT = 1 PANEL = 0 CLRBAR = CONTUR = 0 FINT = 0 FLINE = 10-20 CTYPE = C Attached is the plot. I don't see anything that could be called a wave. This is using GEMPAK 6.2.0. Michael James Unidata > Hello, > > I was wondering if someone at Unidata could try plotting a simple temperature > cross section from the grib file at this link: > > http://laps.noaa.gov/domains/windsor_laps2/data/lapsprd/gr2/ > > I'm using an older version of GEMPAK (5.7.3). I was using these endpoints: > 40.495;-107.522>42.065;-104.153 > and the section that I plotted shows a number of strange-looking "waves" that > I > don't believe are really in the data. > > Thanks for taking a look, > > Brian Jamison > > > > Ticket Details =================== Ticket ID: GBW-617002 Department: Support GEMPAK Priority: Normal Status: Open