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[Support #SHM-766847]: CONDUIT NAM 104 grids and problems in GEMPAK

David,

This difference in the grib files posted at NCEP versus those posted on the 
operational NWSTG server has a history where the bit is physically flipped
when it is sent to the operational systems due to their software expectations.

The model is actually run for 1 timestep, and then the data are output as the
model initial conditions at time 0. The GEMPAK gemlib/gb/gbftim.c routine
had beed written to match the TG modified gribs. I have modified this
routine in the 5.9.4 distribution which you can download from the server now
(source or binary). The dcgrib2 code will name either version of the NCEP or 
NWSTG 
grids as F000, rather than the previous behavior of dropping the Ffff for the 
"initialized analysis".

Steve Chiswell
Unidata Use Support



> Hello,
> 
> Since the change in CONDUIT last week, we are no longer getting
> forecast hour 0 fields in our dcgrib2-created GEMPAK files for the NAM
> 104 grids.  We are still using GEMPAK 5.8.3a.
> 
> A listing of the file from gdinfo shows times of '061031/1200' instead
> of '061031/1200F000' (see below).  I saw in the gembud emailings some
> problems with a bit in the GRIB files indicating Analysis vs Initial
> Forecast Hour and I am guessing this is the problem.  Does this
> problem exist in GEMPAK files that are created from these GRIB data
> using the latest version of GEMPAK?  If so, is there a change we can
> make to our pqact entry?
> 
> The pqact.conf command used to create the grids looks like:
> 
> CONDUIT (MT.nam|nccf/com/nam).*#104
> PIPE    dcgrib2 -t 60 -d
> data/gempak/logs/dcgrib2_ETA104.log
> -e GEMTBL=/usr/local/ldm/NAWIPS-5.8.3a/gempak/tables
> 
> And the results from gdinfo on the file look like this:
> 
> GRID FILE: /home/disk/data/gempak/model/eta/2006103112_eta104.gem
> GRID NAVIGATION:
> PROJECTION:          STR
> ANGLES:                90.0  -105.0     0.0
> GRID SIZE:          147 110
> LL CORNER:              -0.27   -139.48
> UR CORNER:              32.75    -14.60
> 
> GRID ANALYSIS BLOCK:
> UNKNOWN ANALYSIS TYPE
> 
> Number of grids in file: 15080
> 
> Maximum number of grids in file:  18000
> 
> NUM       TIME1              TIME2           LEVL1 LEVL2  VCORD PARM
> 1     061031/1200                              2         HYBL VREL
> 2     061031/1200                              2         HYBL UREL
> 3     061031/1200                              1         HYBL TMPK
> 4     061031/1200                              1         HYBL TRKE
> 5     061031/1200                              1         HYBL UREL
> 6     061031/1200                              1         HYBL RELH
> ........
> 497     061031/1200                              0         MWSL PRES
> 498     061031/1200                              0         MWSL VREL
> 499     061031/1200F000                          0         NONE C00M
> 500     061031/1200F000                          0         NONE P00M
> 501     061031/1200F000                          0         NONE S00M
> 502     061031/1200F000                          0         NONE SWEM
> 503     061031/1200F000                          0         NONE SWRD
> 504     061031/1200F000                          0         NONE BFGR
> 505     061031/1200F000                          0         NONE FXSH
> 506     061031/1200F000                          0         NONE N00M
> 507     061031/1200F000                          0         NONE EVAP
> 508     061031/1200F000                          0         NONE GHFX
> 509     061031/1200F000                          0         NONE FXLH
> 510     061031/1200F000                          0         NONE R00M
> 511     061031/1200F000                          0         NONE LWRD
> 512     061031/1200F000                          0         NONE FXSN
> 513     061031/1200F000                          0         NONE LWRU
> 514     061031/1200F000                          0         NONE PEVAP
> 515     061031/1200F000                          0         NONE SWRU
> 516     061031/1200F000                          0         EATM CLD
> 517     061031/1200F000                          0         EATM CLDA
> 518     061031/1200F000                          0         EATM CCLD
> 519     061031/1200F000                          0         TOPA SWRU
> 520     061031/1200F000                          0         TOPA LWRU
> 521     061031/1200F003                          2         HYBL VREL
> 522     061031/1200F003                          2         HYBL UREL
> 523     061031/1200F003                          1         HYBL HGHT
> 524     061031/1200F003                          1         HYBL SPFH
> 525     061031/1200F003                          1         HYBL UREL
> 
> 
> Thanks for any help and advice.
> 
> Sincerely,
> 
> David
> --
> David Ovens            e-mail: address@hidden
> 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
> 
> 


Ticket Details
===================
Ticket ID: SHM-766847
Department: Support GEMPAK
Priority: Normal
Status: Closed