[nws-changes] 20130122: removal of NCEP's legacy global forecast system lo-res prods -Fwd: ADMIN NOTICE NOUS41 KWBC

• To: nws-changes@xxxxxxxxxxxxxxxx
• Subject: [nws-changes] 20130122: removal of NCEP's legacy global forecast system lo-res prods -Fwd: ADMIN NOTICE NOUS41 KWBC
• From: Linda Miller <lmiller@xxxxxxxxxxxxxxxx>
• Date: Tue, 22 Jan 2013 09:35:14 -0700

-------- Original Message --------

178
NOUS41 KWBC 221605
PNSWSH

Public Information Statement, Comment Request
National Weather Service Headquarters Washington, DC
1105 AM EST Tue Jan 22 2013

To:       Subscribers:
          -Family of Services
          -NOAA Weather Wire Service
          -Emergency Managers Weather Information Network
          -NOAAPORT
          Other NWS Partners, Users and Employees

From:     John Derber, Acting Chief
          Global Climate and Weather Modeling Branch
          NCEP/Environmental Modeling Center

          2013, on the Removal of NCEPs Legacy Global
          Forecast System (GFS) Low-Resolution Products.

The National Centers for Environmental Prediction (NCEP) is
proposing to stop producing some legacy low-resolution gridded
products from the Global Forecast System (GFS), and stop
disseminating them via NOAAPORT and the NWS ftp server.  The NWS
is seeking comments on this proposed change through February 20,
2013.

The operational GFS model is currently run at a resolution of
T574L64, approximately 27 km.  Today output is made available
from the GFS on grids ranging in resolution from 5km up to
5 degrees latitude/longitude. Many of these legacy low-resolution
grids are available for limited forecast hours and fields, and
are not produced for all cycles of the GFS. The same information
is provided on finer-resolution grids. In addition, many of these
products have been removed from the NCEP ftp server and are only
distributed via NOAAPORT and the NWS ftp server. Removing these
legacy products will free up compute and network resources for
newer products.

Operational GFS output is distributed via NOAAPORT, the NWS FTP
server, the NOMADS system

http://nomads.ncep.noaa.gov

every 3 hours and from 204-384 hours every 12 hours for the 00Z,
06Z, 12Z, 18Z cycle times. Output is available on multiple
resolutions and output grids, including 0.5 degree, 1.0 degree,
and 2.5 degree grids. A catalogue of GFS output products and
their availability on multiple ftp servers can be found at

http://www.nco.ncep.noaa.gov/pmb/products/

Listed below are the gridded products available on NOAAPORT and
the NWS ftp server that NCEP is proposing to remove.

Grid   Resolution   Area            Map Projection
------------------------------------------------------
Family of Service (FOS) grids
#21    5x2.5       0-180E, 0-90N    latitude/longitude
#22    5x2.5       180W-0, 0-90N    latitude/longitude
#23    5x2.5       0-180E, 90S-0    latitude/longitude
#24    5x2.5       180W-0, 90S-0    latitude/longitude
#25    5x5         0-355E, 0-90N    latitude/longitude
#26    5x5         0-355E, 90S-0    latitude/longitude

AWIPS grids
#201   381 km       N. Hemisphere   Polar Stereographic
#202   190.5 km     CONUS           Polar Stereographic
#203   190.5 km     Alaska          Polar Stereographic
#204   160 km       Hawaii          Mercator
#205   190.5 km     Puerto Rico     Polar Stereographic

WAFS grids -- only the 00Z cycle grids for hours 96 through 168
are proposed for removal
#37    1.25x1.25    0-90N, 330-60E  latitude/longitude
#39    1.25x1.25    0-90N, 150-240E latitude/longitude
#40    1.25x1.25    0-90N, 240-330E latitude/longitude

The AWIPS grid #201 products are available on NOAAPORT in both
GRIB1 and GRIB2 format, and both are proposed for removal.  More
information about the model grids listed above is available at

http://www.nco.ncep.noaa.gov/pmb/docs/on388/tableb.html

WMO headers for these products slated for removal are listed at:

http://www.nco.ncep.noaa.gov/pmb/changes/docs/gfs_legacy_remove.s
html

In addition to being available on NOAAPORT, many of these grids
are available on the NWS FTP server at:

ftp://tgftp.nws.noaa.gov/SL.us008001/ST.opnl/MT.mrf_CY.00/RD.yyyy
mmdd/PT.grid_DF.bb/  and

ftp://tgftp.nws.noaa.gov/SL.us008001/ST.opnl/MT.gfs_CY.zz/RD.yyyy
mmdd/PT.grid_DF.bb/

where yyyymmdd is the 4-digit year, 2-digit month, and 2-digit
day, and zz is the 2-digit model cycle.

NWS will evaluate all comments to determine whether to proceed
with this change. If approved, a TIN will be issued giving
30 days notice of the implementation date.

   NWS/NCEP Environmental Modeling Center
   College Park, MD
   John.Derber@xxxxxxxx
or
   Rebecca Cosgrove
   NWS/NCEP Central Operations
   College Park, MD
   Rebecca.Cosgrove@xxxxxxxx