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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


ISCS-0057A Add Offshore Water Marine Zone Products on EMWIN


ISCS-0051A Add Flash Flood Advisory to the EMWIN Baseline

Update to ISCS-0051


ISCS-0056 Add PTWC-Generated Tsunami Products for WSO Pago Pago, American Samoa to GIFS


ISCS-0050 Add Buoy data for Eastern Caribbean to GIFS and GNC-A


ISCS-0054A ISCS-0054-A Tropical Cyclone Program (TCP) Harmonization on GIFS

Update to ISCS-0054


ISCS-0053A ISCS-0053-A Tropical Cyclone Program (TCP) Harmonization on EMWIN

Update to ISCS-0053


ISCS-0055 Tropical Cyclone Program (TCP) Harmonization on GNC-A

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