-------- 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
Subject: Soliciting Public Comments through February 20,
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
and the NCEP ftp server. Output is available from 00-192 hours
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.
Send comments on this proposal to:
John Derber
NWS/NCEP Environmental Modeling Center
College Park, MD
John.Derber@xxxxxxxx
or
Rebecca Cosgrove
NWS/NCEP Central Operations
College Park, MD
Rebecca.Cosgrove@xxxxxxxx
National Public Information Statements are online at:
http://www.weather.gov/os/notif.htm
$$