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@noaa.gov National Public Information Statements are online at: http://www.weather.gov/os/notif.htm *Contact Information for Further Information:* ESPC Operations atESPCOperations@noaa.gov and301-817-3880 . *Web Site(s) for applicable information:*N/A This message was sent by ESPC.Notification@noaa.gov . You have been sent this and other notifications because you have opted in to receive it. If for any reason, you wish to unsubscribe, please contact ESPC Help Desk at ESPCOperations@noaa.gov or (301) 817-3880 . Please note: it may take up to two business days to process your unsubscribe request. ** ** --------------070100000200070206040507 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Topic: NPP, Metop-B, Met-10 data to GDAS on August 20, 2013

Date/Time Issued: August 19, 2013 2025 UTC

Product(s) or Data Impacted: NPP, Metop-B, Met-10 data to GDAS

Date/Time of Initial Impact: August 20, 2013 1200 UTC

Date/Time of Expected End: N/A

Length of Outage: N/A

Details/Specifics of Change: Addition of Satellite Observations to Global Data Assimilation System Effective August 20, 2013

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