There is also a Station Select button, which shows a list of the next closest stations. When a visitor requests current conditions from, the geographically closest station is displayed. Over 26,000 weather stations that are part of the Meteorological Assimilation Data Ingest System (MADIS) which is managed by the National Oceanic and Atmospheric Administration (NOAA).Stations are put through strict quality controls and observations are updated as often as every 2.5 seconds. Over 250,000 Personal Weather Stations (PWS's) that are part of Weather Underground's ever-expanding PWS network.These are maintained by the Federal Aviation Administration and observations are updated hourly, or more frequently when adverse weather affecting aviation occurs (low visibility, precipitation, etc).
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