OBS Observation(s) OBSC Obscure Obscuration Any atmospheric phenomenon, except clouds, that restricts vertical visibility (e.g., dust, rain, snow, etc.). One Dobson unit is the equivalent of 2.69/ x 10 16 molecules of ozone/cm 2. Dobson Unit Unit used to measure the abundance of ozone in the atmosphere. 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. Cooperative Observer An 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. 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. Completed in the mid-1990s, the ASOS systems serve as the nation's primary surface weather observing network. NOAA's National Weather Service - Glossary Automated Surface Observing System The ASOS program is a joint effort of the National Weather Service (NWS), the Federal Aviation Administration (FAA), and the Department of Defense (DOD).
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