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Service Change Notice 17-137 Updated

National Weather Service Headquarters Silver Spring MD

1200 PM EST Wed Jan 3 2017


To:        Subscribers:

           -NOAA Weather Wire Service

           -Emergency Managers Weather Information Network


           Other NWS Partners, Users and Employees


From:      Dave Myrick

           NWS Office of Science and Technology Integration


Subject:   Updated: Assimilation of GOES-16 AMV Data into

           GDAS/GFS Effective January 5, 2018


Updated to change the implementation date to January 05, 2018


Effective on or about January 05, 2018, beginning with the 1200

Coordinated Universal Time (UTC) run, the National Centers for

Environmental Prediction (NCEP) will make a change to the

assimilation of Atmospheric Motion Vectors (AMV) data within the

Global Data Analysis System (GDAS) of the Global Forecast



Currently, the GDAS assimilates AMV data from the GOES-13

satellite, which is scheduled to be placed in storage mode and

replaced by the new GOES-16 satellite on January 08, 2018. The

GDAS will therefore assimilate AMV data from the new GOES-16

satellite. The GFS will utilize the new GOES-16 AMV data for all

forecasts from January 05, 2018 onward.


This change will impact all GDAS and GFS analysis data and GFS

model forecast output on NCEP web services and NOAAPORT/SBN.

Users do not need to take any action and will continue to

receive the data as they are currently.


Any questions, comments, or requests regarding this change

should be directed to the contacts below. We will review any

feedback and decide whether to proceed.


For questions regarding these changes to GDAS/GFS, please



Vijay Tallapragada

NCEP/Environmental Modeling Center

College Park, Maryland



For questions regarding the ingest of raw GOES-16 data

into NCEP, please contact:


Jason Levit

NCEP/Environmental Modeling Center

College Park, Maryland



For questions regarding the dataflow aspects of these data sets,

please contact:


  Carissa Klemmer

  NCEP/NCO Dataflow Team Lead

  College Park, Maryland



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