Automated Surface Observing SystemThe ASOS program is a joint effort of the National Weather Service (NWS), the Federal Aviation Administration (FAA), and the Department of Defense (DOD). Completed in the mid-1990s, the ASOS systems serve as the nation's primary surface weather observing network. ASOS is designed to support weather forecast activities and aviation operations and, at the same time, support the needs of the meteorological, hydrological, and climatological research communities.Cooperative ObserverAn individual (or institution) who takes precipitation and temperature observations-and in some cases other observations such as river stage, soil temperature, and evaporation-at or near their home, or place of business. Many observers transmit their reports by touch-tone telephone to an NWS computer, and nearly all observers mail monthly reports to the National Climatic Data Center to be archived and published. Dobson UnitUnit used to measure the abundance of ozone in the atmosphere. One Dobson unit is the equivalent of 2.69/ x 1016 molecules of ozone/cm2.OBSObservation(s)OBSCObscureObscurationAny atmospheric phenomenon, except clouds, that restricts vertical visibility (e.g., dust, rain, snow, etc.). Obscuring PhenomenaAny atmospheric phenomenon, except clouds, that restricts vertical visibility (e.g., dust, rain, snow, etc.).Observation WellIn hydrologic terms, a non-pumping well used for observing the elevation of the water table or piezometric surfaceRawinsonde ObservationA radiosonde observation which includes wind data.Remote Observing System AutomationA type of automated data transmitter used by NWS Cooperative Program observers.River Observing StationAn established location along a river designated for observing and measuring properties of the river.Voluntary Observing Ship Program(VOS) - An international voluntary marine observation program under the auspices of the World Meteorological Organization (WMO). Observations are coded in a special format known as the ships synoptic code, or "BBXX" format. They are then distributed for use by meteorologists in weather forecasting, by oceanographers, ship routing services, fishermen, and many others.
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