Skip Navigation 
NOAA logo - Select to go to the NOAA homepage National Weather Service

 Headquarters Office NWS logo
NWS Office of the Chief Information Officer/Telecommunication Operations Center
Text Forecast is the U.S. government's official web portal to all federal, state and local government web resources and services.



    Data Streams

    OPMET Content

    Program Manager

    Service Access

    System Components
International Satellite Communications System

The World Area Forecast System (WAFS)
and the
The Regional Main Telecommunication Network (RMTN-IV)


The ISCS has two parts. The two systems are for meteorological data delivery. They use the same satellites and communication protocols. The first service is the World Area Forecast System (WAFS) in support of the International Civil Aviation Organization (ICAO) program for aviation data distribution. The second service is a Global Telecommunication System (GTS) satellite data exchange system for WMO Region IV (North America) data exchange.

The ISCS Program Manager provides additional details and a modernization project that will use new telecommunication technology.

  1. The purpose of the WAFS broadcast is to make globally available the centrally produced aviation model forecast products of a World Area Forecast Center (WAFC) in standard gridded form (WMO GRIB code) as well as other supporting data for flight operations to as many aviation users as possible.
    1. The United States supports this requirement (as a servicing WAFC) with a delivery system called the ISCS/WAFS. The global coverage is approximately from 105 E° eastward to 65 E° , covering the Pacific Ocean , Atlantic Ocean , North America, and South America. The remainder of the world coverage is supported by the WAFC located in the United Kingdom through their satellite broadcast system called SADIS. SADIS covers the European, Asian, African continents and the Indian Ocean.
    2. These are point-to-multi-point delivery system which is an additive component to the Aeronautical Fixed Telecommunication Network (AFTN). This system does not, therefore, replace the data acquisition/distribution functions of the ICAO/AFTN.
  2. The purpose of the GTS broadcast dissemination and data acquisition system (a two-way system), called the ISCS/RMTN-IV (see graphic depiction of area of two-way coverage), replaces the two WMO Region IV GTS regional communication networks of the Antilles Meteorological (ANMET) and Central America Meteorological (CEMET) circuitry
    1. This communications system increases the success of data delivery and receipt within that part of a WMO Region where past ground communications was difficult to maintain.
    2. This system supports WMO GTS needs for the exchange of all data types among WMO Member countries.

    US Dept of Commerce
    National Oceanic and Atmospheric Administration
    National Weather Service
    Office of Operational Systems (OPS)
    1325 East West Highway
    Silver Spring, MD 20910
    Page Author: NWS Internet Services Team
Information Quality
Privacy Policy
Freedom of Information Act (FOIA)
About Us
Career Opportunities
     Page last Modified: 10 April, 2013 2:11 PM