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The US National Weather Service "International Services and Communication Systems" (ISCS) activity is a collective group of message dissemination systems used to provide weather, water and climate information to segments of the World Meteorological Organization (WMO) International community as described in WMO document No. 386 - Manual on the Global Telecommunication System. The ISCS systems provide service to WMO Regional Association IV (RA-IV) and are managed by the US National Weather Service (NWS) Dissemination Systems Branch (W/OPS17); they include:

  • GTS Internet File Service (GIFS)
  • GeoNetCast - Americas (GNC-A)
  • Emergency Managers Weather Information Network (EMWIN)

ISCS systems are an integral part of the RA-IV Regional Meteorological Telecommunications Network (RMTN), which focuses on the timely collection and delivery of both time-critical and routine watches, warnings, observations and forecasts.

Additional telecommunication systems are identified as part of the RA-IV RMTN which supplement the capabilities of the ISCS systems for the exchange of messages. These other systems include:

  • Secure Socket Layer Virtual Private Network (SSL VPN) / NWSTG FTP Ingest Server [RTH Washington System]
  • Email Data Input Service (EDIS) [RTH Washington System]
  • WAFS Internet File Service (WIFS) receive service [WAFC Washington System (FAA/ICAO)]

ISCS Notification

9/23/2014 ISCS-0070




Add Local Storm Report to the EMWIN Broadcast


Soliciting Comments on Experimental International Tsunami Products for the Pacific Basin through September 30, 2014

For more information click here

9/5/2014: ISCS-0069


9/4/2014: ISCS-0068

Remove SACN62 CWAO from the EMWIN Broadcast

9/3/2013: The effective date of 01 September 2014 for the ISCS/GIFS file naming format for bulletin messages will be revised to include the Advanced Weather Interactive Processing System (AWIPS) identifier (ID) added to the end of the file name has been changed.

The new effective date and time will be 10 September 2014 AT 1400 UTC

The information contaned in DM07-14.03 is also posted on the data management change notices web page.

9/2/2014: Notice to all WMO Regional Association IV Member States ISCS/GeoNetCast Americas,(GNCA) Users.

Effective 12:00 (UTC) 09 September 2014 the ISCS/GNCA file naming format for the "Alert" and "WMO/WMC" channels will change.

For more information click here.

8/6/2014: ISCS-0067

RA-IV 2013 Tropical Cyclone Program Harmonization (TCP) on GNC-A

8/6/2014: ISCS-0066

RA-IV 2013 Tropical Cyclone Program Harmonization (TCP) on GIFS

8/6/2014: ISCS-0065

RA-IV 2013 Tropical Cyclone Program Harmonization (TCP) on EMWIN

ISCS Network SSL-VPN Email Data Input Service (EDIS) Aviation Weather (WIFS) GeoNetCast Americas (GNC-A) EMWIN Antigua Bahamas Barbados Belize Costa Rica Curacao El Salvador Jamaica St. Lucia Trinidad GTS Internet File Service (GIFS) AWC Kansas City Guyana