How information relating to the World Area Forecast System (WAFS) is collected and shared
To meet the requirements for World Area Forecast System (WAFS) dissemination in Europe, the ICAO European Air Navigation Planning Group developed a system for the distribution of WAFS data via satellite, as one component of the Aeronautical Fixed System. Originally the system was intended to serve the ICAO European (EUR) and Middle East (MID) Regions, but it was subsequently extended to serve the Africa-Indian Ocean (AFI) Region and the western part of the ASIA Region.
The system is now capable of serving all States in the AFI and MID Regions and the ASIA and EUR States up to about 140° East and is known as the Satellite Distribution System for Information Relating to Air Navigation (SADIS). The SADIS service comprises Operational Meteorological Information (OPMET), which includes World Area Forecast System data and other quality controlled data such as Aerodrome Meteorological Reports (METAR), Aerodrome Forecasts (TAF), warnings of hazardous en-route weather conditions (SIGMET) and Volcanic Ash Advisory etc. from around the world.
There are currently over 100 States who receive and operationally use data from SADIS, with a high number of users taking data from the satellite broadcast using Very Small Aperture Terminals (VSAT). Additionally, a number of users are now utilizing the SADIS FTP server, which provides all of the information that is available on the satellite broadcast, securely over the public internet.