NOUS41 KWBC 281800



Service Change Notice 17-91

National Weather Service Headquarters Silver Spring, MD

200 PM EDT Fri Jul 28 2017


To:       Subscribers:

          -NOAA Weather Wire Service

          -Emergency Managers Weather Information Network


          Other NWS partners and NWS employees


From:     Michelle Mainelli

          Acting Director, Office of Dissemination


Subject:  EMWIN GOES-East satellite broadcast signal and file

          format changes effective November 2017


Effective in November 2017, the National Environmental

Satellite, Data, and Information Service (NESDIS) Geostationary

Operational Environmental Satellite (GOES)-16 will replace the

existing operational GOES-13 at the GOES-East geosynchronous

orbit location of 75 degrees west longitude. The GOES-East

location assignment was announced by NESDIS on May 25, 2017. The

specific date and time in November for the replacement has not

been announced. An updated Service Change Notice will be sent

when the date is determined.


The NWS and NESDIS hosted two public Webinars in April and

August 2016 to identify and review the changes to the Emergency

Managers Weather Information Network (EMWIN) broadcasts with the

introduction of GOES-16. The Webinars also included time to

receive and respond to participant questions and comments

regarding these changes. Participants included individual users,

emergency managers, third party emergency alert service

providers, media outlets and hardware and software

manufacturers. The presentations provided at these Webinars are

available here:


The operational deployment of GOES-16 introduces three changes

to the GOES-East EMWIN broadcast impacting the reception and

decoding of products in the High Rate Information Transmission

(HRIT)/EMWIN L-band satellite broadcast data stream, as follows:


-HRIT/EMWIN Receiver: GOES-16 broadcasts the EMWIN and the

NESDIS HRIT data streams over a single transponder in a combined

HRIT/EMWIN format. EMWIN receive stations will need to be

updated with an HRIT/EMWIN receiver and antenna system to

receive and decode the EMWIN data stream from the HRIT/EMWIN



-Full-File Format: The products on the EMWIN segment of the

GOES-16 HRIT/EMWIN broadcast are sent as complete files, in

contrast to the Quick Block Transfer (QBT) packet format

employed on the GOES-13 EMWIN broadcast. Software updates may be

required to properly handle this new full-file format.


-File Name Change: The file name assigned to each of the full-

file products on the EMWIN segment of the HRIT/EMWIN broadcast

will contain 63 to 66 alpha-numeric characters followed by a

period and a three character file extension. The new file name

convention is online at:


The GOES-16 satellite is now in orbit at a service check-out

location (89.5 degrees west longitude) until November 2017.  The

satellite's HRIT/EMWIN transponder is active but may

periodically be taken off line to accommodate other spacecraft

events. Users are encouraged to install and verify the

operations of new or updated HRIT/EMWIN receive equipment and

software. The HRIT/EMWIN broadcast should not be used for

operations until GOES-16 is declared operational in November 2017.


Questions or comments regarding these changes may be emailed to

the NWS EMWIN support staff at:


National Service Change Notices are online at: