[nws-changes] 20130719:addn of satellite obs to GDAS Fwd: ADMIN NOTICE NOUS41 KWBC

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652
NOUS41 KWBC 191446
PNSWSH
Technical Implementation Notice 13-18 
National Weather Service Headquarters, Washington, DC
1045 AM EDT Fri Jul 19 2013
To: Subscribers: 
             -Family of Services
             -NOAA Weather Wire Service
             -Emergency Managers Weather Information Network
             -NOAAPORT
             Other NWS Partners, Users and Employees
From: Tim McClung 
             Science Plans Branch Chief
             Office of Science and Technology
Subject: Addition of Satellite Observations to Global Data 
             Assimilation System Effective August 20, 2013
Effective Tuesday, August 20, 2013, with the 1200 Universal 
Coordinated Time (UTC) cycle, the National Centers for
Environmental Prediction (NCEP) will begin incorporating
additional satellite data in the Global Data Assimilation System
(GDAS). These data are necessary to keep up with the evolving
observing system. This change does not alter the format or
content of any output from the GDAS.
The additional observations to be included are the NPP CrIS data, 
METOP-B AMSU-A/MHS/GRAS data, and SEVIRI data from Meteosat-10.
All data should provide some additional information to the
assimilation system, but experiments to date have not shown any
significant positive or negative forecast impact.

In addition to the potential additional information in the data,
the observations are being added to increase the resiliency to
potential future loss and evolution of the observing system. The
NPP CrIS data supplies similar information and is in a similar
orbit to the Aqua AIRS data.  The METOP-B data is being
incorporated since the METOP-B satellite is replacing the METOP-A
satellite as the primary morning satellite.  SEVIRI data from
Meteosat-10 replaces data from Meteosat-9.
If you have questions about this change, please contact: John Derber 
   NWS/NCEP Environmental Modeling Center
   College Park, MD
   john.derber@xxxxxxxx
National Public Information Statements are online at: http://www.weather.gov/os/notif.htm $$
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