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NOUS41 KWBC 271830
PNSWSH

Public Information Statement 17-19
National Weather Service Headquarters Silver Spring MD
230 PM EDT Thu Apr 27 2017

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

From:  Jeff Craven
  Chief, Statistical Modeling Branch
  Meteorological Development Laboratory

Subject:  Soliciting Public Comments on the Proposed Upgrade of
  2.5 km Gridded Model Output Statistics Guidance over
  the CONUS to operational status through May 31, 2017

The Meteorological Development Laboratory (MDL) is proposing to
upgrade the Global Forecast System (GFS)-based Gridded Model
Output Statistics (MOS) guidance at 2.5 km resolution over the
Continental U.S. (CONUS) from experimental to operational
status, replacing the operational 5 km CONUS guidance.
The NWS is seeking comments on this proposed change through
May 31, 2017.

On November 15, 2012, MDL began disseminating experimental
2.5 km Gridded MOS guidance over the CONUS, with the intention
of replacing the operational 5 km products at some future date
once all users and systems are able to use the higher resolution
guidance. These changes were announced in a Public Information
Statement issued on October 13, 2011, and in Technical
Implementation Notice 12-09. These notices can be viewed at the
following links:

http://www.nws.noaa.gov/os/notification/pns11_2.5km.txt
http://www.nws.noaa.gov/os/notification/tin12-09gmos-
conus_aaa.txt

MDL is proposing to upgrade the 2.5 km CONUS guidance from
experimental to operational status on or about mid-July 2017.
At that time, the 5 km GRIB2 products will no longer be sent
across the Satellite Broadcast Network (SBN) and NOAAPORT, and
will be replaced with the 2.5 km products in the operational
(ST.opnl) directory of the National Digital Guidance Database
(NDGD) on the NWS ftp server (TGFTP).

Current location of 2.5 km CONUS Gridded MOS products on TGFTP:
ftp://tgftp.nws.noaa.gov/SL.us008001/ST.expr/DF.gr2/DC.ndgd/GT.m
osgfs/AR.conus/

Future location of 2.5 km CONUS Gridded MOS products on TGFTP
after transition to operational status:
ftp://tgftp.nws.noaa.gov/SL.us008001/ST.opnl/DF.gr2/DC.ndgd/GT.m
osgfs/AR.conus/

A list of 5 km products and associated headers that are proposed
for removal from the SBN, NOAAPORT and NDGD is provided in
Table 1 below.A list of 2.5 km products and associated headers
that will be moved from the experimental directory to the
operational directory in NDGD is provided in Table 2 below.

Table 1: WMO communication identifiers for 5 km Gridded MOS
products that are proposed for removal from the SBN, NOAAPORT,
and NDGD (below are representations of the WMO headers)

WMO HEADING    ELEMENT NAME
-----------    ------------------------------
LAUxxx KWBQ    Sky Cover
LBUxxx KWBQ    Wind Direction
LCUxxx KWBQ    Wind Speed
LDUxxx KWBQ    12-h Prob. of Precipitation
LEUxxx KWBQ    2-m Temperature
LFUxxx KWBQ    2-m Dewpoint Temperature
LGUxxx KWBQ    Daytime Maximum Temperature
LHUxxx KWBQ    Nighttime Minimum Temperature
LIUxxx KWBQ    6-h Quant. Precip. Amount
LJUxxx KWBQ    6-h Prob. of a Thunderstorm
LRUxxx KWBQ    Relative Humidity
LSUxxx KWBQ    24-h Snowfall Amount
LUUxxx KWBQ    6-h Prob. of Precipitation
LVUxxx KWBQ    12-h Quant. Precip. Amount
LWUxxx KWBQ    Wind Gusts
LXUxxx KWBQ    12-h Prob. of a Thunderstorm
LYUxxx KWBQ    3-h Prob. of a Thunderstorm

Table 2: WMO superheaders for 2.5 km Gridded MOS products that
will be moved from the experimental directory to the operational
directory on TGFTP (Below are representations of the
superheaders, where ii=98 for days 1-3, ii=97 for days 4-7, and
ii=96 for days 8 and beyond.)

SUPERHEADER    ELEMENT NAME
-----------------------------------------
MAUZii KWBQ    Cond. Prob. Freezing Precip.
MBUZii KWBQ    Cond. Prob. Frozen Precip.
MCUZii KWBQ    Cond. Prob. Liquid Precip.
YAUZii KWBQ    Sky Cover
YBUZii KWBQ    Wind Direction
YCUZii KWBQ    Wind Speed
YDUZii KWBQ    12-h Prob. of Precipitation
YEUZii KWBQ    2-m Temperature
YFUZii KWBQ    2-m Dewpoint Temperature
YGUZii KWBQ    Daytime Maximum Temperature
YHUZii KWBQ    Nighttime Minimum Temperature
YIUZii KWBQ    6-h Quant. Precip. Amount
YJUZii KWBQ    6-h Prob. of a Thunderstorm
YLUZii KWBQ    Precip. Type Best Category
YMUZii KWBQ    Precip. Potential Index
YNUZii KWBQ    Prob. Precip. Occurrence
YRUZii KWBQ    Relative Humidity
YSUZii KWBQ    24-h Snowfall Amount
YUUZii KWBQ    6-h Prob. of Precipitation
YVUZii KWBQ    12-h Quant. Precip. Amount
YWUZii KWBQ    Wind Gusts
YXUZii KWBQ    12-h Prob. of a Thunderstorm
YYUZii KWBQ    3-h Prob. of a Thunderstorm
YZUZii KWBQ    Predominant Weather

The NWS will evaluate all comments to determine whether to
proceed with this change.

Send comments on this proposal to:

     Jeff Craven
     Chief, Statistical Modeling Branch
     Meteorological Development Laboratory
     Office of Science and Technology Integration
     Silver Spring, MD
     jeffrey.craven@noaa.gov
     301-427-9475

National Public Information Statements are online at:

  http://www.nws.noaa.gov/om/notif.htm



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