Weather station at Mildura Airport, Victoria, Australia.
Surface weather observations are the fundamental data used for safety as well as climatological reasons to forecast weather and issue warnings worldwide.[1] They can be taken manually, by a weather observer, by computer through the use of automated weather stations, or in a hybrid scheme using weather observers to augment the otherwise automated weather station. The ICAO defines the International Standard Atmosphere (ISA), which is the model of the standard variation of pressure, temperature, density, and viscosity with altitude in the Earth's atmosphere, and is used to reduce a station pressure to sea level pressure. Airport observations can be transmitted worldwide through the use of the METAR observing code. Personal weather stations taking automated observations can transmit their data to the United States mesonet through the Citizen Weather Observer Program (CWOP), the UK Met Office through their Weather Observations Website (WOW),[2] or internationally through the Weather Underground Internet site.[3] A thirty-year average of a location's weather observations is traditionally used to determine the station's climate.[4] In the US a network of Cooperative Observers make a daily record of summary weather and sometimes water level information.
^Office of the Federal Coordinator of Meteorology. Surface Weather Observation Program. Archived 2009-05-06 at the Wayback Machine Retrieved on 2008-01-12.
^"WOW - A new weather website for everyone". Met Office. 2011-02-11. Archived from the original on 2014-08-15.
^Weather Underground. Personal Weather Station. Retrieved on 2008-03-09.
^MetOffice. Climate Averages. Archived 2009-07-06 at the Wayback Machine Retrieved on 2008-03-09.
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