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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



Add Barbados CLIMAT Product in BUFR Format to GIFS and GNCA


Add Barbados SYNOP and TEMP Products in BUFR Format to GIFS and GNCA
04/29/2015 Email Data Input System/EDIS/ has been modified to
accept WMO bulletins as Email attachments

Click here for more information

04/06/2015 ISCS-0093

Add Products to 12 New GNCA NWS Sub-Channels
04/06/2015 ISCS-0091

Add Global Forecast System (GFS) GRIB2 Forecast Products to GIFS
04/06/2015 ISCS-0092A

Add PTWC Tsunami Products to EMWIN
03/25/2015 ISCS-0089

Add Dominican Republic SYNOP Products in BUFR Format to GIFS and GNC-A

03/20/2015 ISCS-0088B

Add WFO Albany NY Climate Products/Record Reports to EMWIN

03/18/2015 ISCS-0090

Add PTWC-Generated Tsunami Products for WSO Pago Pago, American Samoa to EMWIN & GNCA

03/09/2015 ISCS-0087

Delete WFO Key West (KEYW) products with AWIPS Product Designator EYW - 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