![]() Information contained in a METAR Ī typical METAR contains data for the temperature, dew point, wind direction and speed, precipitation, cloud cover and heights, visibility, and barometric pressure. 782 "Aerodrome Reports and Forecasts" contains the base METAR code as adopted by the WMO member countries. North American countries continued to use a Surface Aviation Observation (SAO) for current weather conditions until 1 June 1996, when this report was replaced with an approved variant of the METAR agreed upon in a 1989 Geneva agreement. The METAR format was introduced 1 January 1968 internationally and has been modified a number of times since. ![]() Observations may also be taken by trained observers or forecasters who manually observe and encode their observations prior to transmission. Some locations still use augmented observations, which are recorded by digital sensors, encoded via software, and then reviewed by certified weather observers or forecasters prior to being transmitted. ![]() Some METARs are encoded by automated airport weather stations located at airports, military bases, and other sites. Some stations make regular reports more frequently, such as Pierce County Airport (ICAO code: KPLU) which issues reports three times per hour. Reports are generated once an hour or half-hour at most stations, but if conditions change significantly at a staffed location, a report known as a special ( SPECI) may be issued. METARs typically come from airports or permanent weather observation stations. METAR is also known as Meteorological Terminal Aviation Routine Weather Report or Meteorological Aerodrome Report. The National Oceanic and Atmospheric Administration (part of the United States Department of Commerce) and the United Kingdom's Met Office both employ the definition used by the FAA. The United States Federal Aviation Administration (FAA) in its publication the Aeronautical Information Manual describes the report as aviation routine weather report while the international authority for the code form, the World Meteorological Organization (WMO), describes it as the aerodrome routine meteorological report. It is highly standardized through the International Civil Aviation Organization (ICAO), which allows it to be understood throughout most of the world. Raw METAR is the most common format in the world for the transmission of observational weather data. A METAR weather report is predominantly used by aircraft pilots, and by meteorologists, who use aggregated METAR information to assist in weather forecasting. METAR is a format for reporting weather information.
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