[gembud] problems with NAM 104/255 CONDUIT files

[David Ovens]

CONDUIT users and Gembuds,

As you know, the CONDUIT data feed recently dropped the NAM 104 grids
in GRIB1 format.  We are receiving the 90-km NAM grids in GRIB2 format
under the following pqact entry:

 CONDUIT	  /nam\.t(..)z\.grbgrd.*grib2

Most everything looks fine; however, when I convert these files to
GEMPAK using dcgrib2 from 5.9.4, 5.10.3, or 5.10.4, the PMSL field is
all fouled up.  The following URL shows what I get for a 'CINT=0' setting: 
  http://www.atmos.washington.edu/~ovens/2007110600_badpmsl.gif

Here's how I decoded the file:

 $GEMEXE/dcgrib2 -d - 2007110600_nam104.gem < \
 /home/disk/data/conduit/nam.20071106/nam.t00z.grbgrd00.tm00.grib2

I suspect this is a problem with the GRIB2 file (my first guess) or
the way GEMPAK is decoding the sea-level pressure field.

Does anyone have a fix for this yet?

Thanks,

David
-- 
David Ovens		 e-mail: ovens at atmos.washington.edu
Research Meteorologist    phone: (206) 685-8108
Dept of Atm. Sciences      plan: Real-time MM5 forecasting for the
Box 351640                        Pacific Northwest
University of Washington          http://www.atmos.washington.edu/mm5rt
Seattle, WA  98195               Weather Graphics and Loops
                                  http://www.atmos.washington.edu/~ovens/loops