Trouble Converting NCEP Reanalysis To Gempak

• To: gembud@xxxxxxxxxxxxxxxx
• Subject: Trouble Converting NCEP Reanalysis To Gempak
• From: mpborkow@xxxxxxxx
• Date: Wed, 13 Jul 2005 14:13:16 -0400 (EDT)

Hello,

I'm trying to convert Daily Global NCEP/NCAR Reanalysis for 2002-2004 to
Gempak using files downloaded from ftp.cdc.noaa.gov.  I'm using a program
that calls DCREANAL to do this.  The trouble is with the surface data.

The data for each year through September 7 is converted fine and it is
useable.  But beginning September 8 of each year, I am not able to access
the grids.  If I take one of the surface files (for instance, pmsl_02.gem
has PMSL for each day/hour in 2002) and run GDINFO setting GDATTIM to any
date prior to September 8 (i.e. GDATTIM = 020625/0000) it will return 1
matching PMSL grid.  If I run it setting GDATTIM to September 8 or any
later date (i.e. GDATTIM = 021015/0000) GDINFO returns "The time
021015/0000 is not found in the data set."  But then I can run GDINFO with
GDATTIM = all, and will find that all the times/dates after September 8
are indeed listed, but for some reason I can just no longer call them
using GDATTIM.

Has anyone ever encountered such a problem or have any suggested
troubleshooting tips?

-Matt

• Follow-Ups:
  • 20050713: Trouble Converting NCEP Reanalysis To Gempak
    • From: Steve Chiswell