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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:

  • NWSTG FTPS 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

6/10/2016 ISCS-0123A

Tsunami Product Harmonization - GIFS GNC-A

5/26/2016 ISCS-0122

Tsunami Product Harmonization - EMWIN

5/11/2016 ISCS-0118

Change WMO Header to PAFC for Climate Products CLI, CLM, RER - EMWIN

5/11/2016 ISCS-0117

Change WMO Header to PAFC for Climate Products CLI, CLM, RER - EMWIN

5/11/2016 ISCS-0116

Change WMO Header to PAJK for Climate Products CLI, CLM, RER - EMWIN



The NOAA Wallops Command and Data Acquisition Station (WCDAS) has scheduled a power outage for Wednesday, May 11, 2016, to perform critical maintenance on the power system. This power outage will disrupt the EMWIN broadcast.

More information can be found here.



Transition of GeoNetCast Americas to new satellite uplink system.



Update WFO-SJU Baseline - EMWIN

WFO San Juan has requested the EMWIN baseline be updated to assure correct distribution of its products.

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