[nws-changes] 20121116: termination of NCEP's legacy global data assim sys-Fwd: ADMIN NOTICE NOUS41 KWBC

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

664
NOUS41 KWBC 161925
PNSWSH
Technical Implementation Notice 12-57 
National Weather Service Headquarters, Washington, DC
225 PM EST Fri Nov 16 2012
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: Termination of NCEPs Legacy Global Data 
          Assimilation System: Effective January 08, 2013
Effective Tuesday, January 8, 2013, with the 1200 Universal 
Coordinated Time (UTC) cycle, the National Centers for
Environmental Prediction (NCEP) will stop running the legacy
Global Data Assimilation System (GDAS2) and discontinue all
associated output products.  This change does not impact any
output from the existing higher-resolution Global Data
Assimilation System (GDAS1).
A Public Information Statement was issued on September 27, 2012, 
requesting comments on the proposed termination of the GDAS2.
www.nws.noaa.gov/os/notification/pns12gdas2_removal.htm Based on responses received, NWS will terminate the GDAS2 and all 
associated output products on January 8, 2013.
The GDAS2 are legacy products with a horizontal resolution of 
triangular truncation T62 (about 208 km on 28 sigma layers),
which is much less than the resolution of the current Global
Forecast System (GFS), and the current GDAS1 system. As outlined
in the PNS referenced above, corresponding products are available
from the higher-resolution GDAS1 for all GDAS2 products to be
discontinued. The GDAS2 products were not created independently
from the GDAS1 products and were interpolated fields from the
higher resolution products.
The GDAS2 output is only disseminated via the NCEP FTP server. No 
GDAS2 products are sent on NOAAPORT. The exact filenames being
removed, along with the corresponding replacement GDAS1
filenames, are outlined in the PNS referenced above.
If you have questions about this termination, please contact: 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 $$
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