Re: Problems decoding GRIB2 GFS Ensemble grids

• To: "Kevin R. Tyle" <ktyle@xxxxxxxxxxxxxxxx>
• Subject: Re: Problems decoding GRIB2 GFS Ensemble grids
• From: Steve Chiswell <chiz@xxxxxxxxxxxxxxxx>
• Date: Mon, 09 Oct 2006 16:53:52 -0600

Kevin,

The GEMPAK GRIB2 parameter tables use 4 numbers to define the parameter
name.
The 4th column is the parameter template, which allows different names
to be assigned depending on the type ofaccumulation, average, ensemble
etc. used.
Log messages from dcgrib2 under "decode_grib2 -34" about unknown

for ensemble PDTs 1 and 11 in column 4).

Updated g2varswmo2.tbl and g2varsncep1.tbl tables which include the
ensemble entries can be downloaded from:

http://www.unidata.ucar.edu/downloads/gempak/tables/

Steve Chiswell
Unidata User SUpport




On Mon, 2006-10-09 at 21:26 -0600, Kevin R. Tyle wrote:

I've been attempting to decode the GFS ensemble data from the "new" CONDUIT NCEP ftp directory, as described in http://www.unidata.ucar.edu/data/conduit/ldm_idd/ensemble_files.html#GRIB2. However, dcgrib2 is not able to determine the GEMPAK parameter name, and no GEMPAK grid is created. I've attached the output from the dcgrib2 log.

Command line used: dcgrib2 -v 4 -d dcgrib.log YYMMHHDD_gefs_@@@.gem < gec00.t12z.pgrb2af48

Any ideas?

Thanks,

Kevin

______________________________________________________________________
Kevin Tyle, Systems Administrator               **********************
Dept. of Earth & Atmospheric Sciences           ktyle@xxxxxxxxxxxxxxxx
University at Albany, ES-235                    518-442-4578 (voice)
1400 Washington Avenue                          518-442-5825 (fax)
Albany, NY 12222                                **********************
______________________________________________________________________

--
Steve Chiswell <chiz@xxxxxxxxxxxxxxxx>
Unidata

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