Automated Meteorological Data Acquisition System: Difference between revisions

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[[File:Expo AMeDAS-2005-7-22.jpg|thumb|AMeDAS]]

'''AMeDAS''' (automated meteorological data acquisition system)''', commonly known in Japanese as "アメダス" (''amedasu''), is a high-resolution [[surface observation]] network developed by the [[Japan Meteorological Agency]] (JMA) used for gathering regional weather data and verifying forecast performance. The system began operating on 1 November 1974, and currently comprises 1,300 stations throughout Japan (of which over 1,100 are unmanned), with an average separation of {{convert|17|km|mi|abbr=on}}.

'''AMeDAS'''Automated (automatedMeteorological meteorologicalData dataAcquisition acquisitionSystem''' system)('''AMeDAS'''), commonly known in Japanese as "アメダス" (''amedasu''), is a high-resolution [[surface observation]] network developed by the [[Japan Meteorological Agency]] (JMA) used for gathering regional weather data and verifying forecast performance. The system began operating on 1 November 1974, and currently comprises 1,300 stations throughout Japan (of which over 1,100 are unmannedunstaffed), with an average separation of {{convert|17|km|mi|abbr=on}}.

Observations at manned stations cover weather, wind [[wind direction|direction]] and [[wind speed|speed]], types and amounts of [[Precipitation (meteorology)|precipitation]], [[List of cloud types|types]] and [[Cloud base|base]] heights of clouds, [[visibility]], air temperature, [[humidity]], [[sunshine duration]], and [[atmospheric pressure]]. All of these (except weather, visibility and cloud-related meteorological elements) are observed automatically.

Observations at mannedstaffed stations cover weather, wind [[wind direction|direction]] and [[wind speed|speed]], types and amounts of [[Precipitation (meteorology)|precipitation]], [[List of cloud types|types]] and [[Cloud base|base]] heights of clouds, [[visibility]], air temperature, [[humidity]], [[sunshine duration]], and [[atmospheric pressure]]. All of these (except weather, visibility and cloud-related meteorological elements) are observed automatically.

At unmanned stations, observations are performed every 10 minutes. About 700 of the unmanned stations observe precipitation, air temperature, wind direction and speed, and sunshine duration, while the other stations observe only precipitation.

At unmannedunstaffed stations, observations are performed every 10 minutes. About 700 of the unmannedunstaffed stations observe precipitation, air temperature, wind direction and speed, and sunshine duration, while the other stations observe only precipitation.

For about 280 stations (manned or unmanned) located in areas of heavy snowfall, snow depth is also observed.

For about 280 stations (mannedstaffed or unmannedunstaffed) located in areas of heavy snowfall, snow depth is also observed.

All the observational data is transmitted to the AMeDAS Center at JMA Headquarters in Tokyo on a [[Real-time computing|real time]] basis via dedicated telephone lines. The data is then delivered to the whole country after a quality check.

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== External links ==

{{commons category}}

* [http://www.jma.go.jp/jma/en/Activities/observations.html Japan Meteorological Agency observations descriptions]

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{{DEFAULTSORT:Automated Meteorological Data Acquisition System}}

[[Category:1974 establishments in Japan]]

[[Category:1974 in computing]]

[[Category:Japanese inventions]]

[[Category:Geography of Japan]]

[[Category:Japan Meteorological Agency]]

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[[Category:Science and technology in Japan]]

{{Climatemeteorology-stub}}