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19990324: Partial NGM Grids

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  • Subject: 19990324: Partial NGM Grids
  • Date: Wed, 24 Mar 1999 10:58:34 -0700
Devin,

If you are seeing data in the NW chunk of the US, then
it sounds like you are looking at an Alaskan grid on a
US projection.

Since December, the IDD has been receiving NOAAport data, which
includes NGM grids on several projections, not just #211.
To specify that you want to send grid #211 ngm files to
dcgrib, you should specify grid "Q" in the pqact.conf entry,
or use the "@@@" template in dcgrib to place different grids into
separate files.

Here is a segment of the pqact.conf entry for NGM grids:
#
# NGM model output
# Grid #211 CONUS   80km: ^[YZ].Q.*/mNGM
# Grid #207 Alaska  95km: ^[YZ].N.*/mNGM
# Grid #202 CONUS  190km: ^[YZ].I.*/mNGM
# Grid #213 CONUS 47.5km: ^[YZ].H.*/mNGM
# Select any/all grids desired from [QNIH]
HRS     ^[YZ].[Q].*/mNGM
        PIPE    decoders/dcgrib -d logs/dcgrib.log
                -g /home/gempak/NAWIPS-5.4/gempak5.4/tables
                PACK data/gempak/hds/YYMMDDHH_ngm@@@.gem

If you pass only grid "Q" to the decoder, you do not need to use the
@@@ template. If you pass more than one projection to the decoder, use
the template to separate out the grids into different file names,
or use a separate pqact.conf entry for each projection.


Steve Chiswell
Unidata User Support



On Wed, 24 Mar 1999, Devin Kramer wrote:

> We have noticed on occasion (like this morning) that we only get a small
> piece of the 12Z NGM grids.  We get the complete set of fields but only
> for a small subset of the grid covering the NW US.  This does not happen
> on a consistent basis but it does always seem to be the 12Z NGM and its
> always a NW chunk of the grid.  We checked with our friends and NCSU and
> they have the entire thing so I assume it is not an across the board
> problem. Has anyone else seen such a problem in the past or maybe even
> with today's 12Z NGM data?  If it matters we are converting the GRIB
> files into GEMPAK.
> 
> 
> Thanks!
> Devin
> 
> --
> --------------------------------------------------------
> Programmer Analyst    Department of Atmospheric Science
> University of California Los Angeles
> PH:(310)825-2418 FAX:(310)206-5219
> http://www.atmos.ucla.edu/
> --------------------------------------------------------
> 
> 
> 
>