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Severe weather can occur under a variety of situations, but three characteristics are generally needed: a temperature or moisture boundary, moisture, and (in the event of severe, precipitation-based events) instability in the atmosphere.
Also actiniform. Describing a collection of low-lying, radially structured clouds with distinct shapes (resembling leaves or wheels in satellite imagery), and typically organized in extensive mesoscale fields over marine environments. They are closely related to and sometimes considered a variant of stratocumulus clouds. actinometer A scientific instrument used to measure the heating power of ...
Map of regions covered by the 122 Weather Forecast Offices. The National Weather Service operates 122 weather forecast offices. [1] [2] Each weather forecast office (WFO or NWSFO) has a geographic area of responsibility, also known as a county warning area, for issuing local public, marine, aviation, fire, and hydrology forecasts.
All average annual temperatures are compiled from weather data collected from 1981 to 2010 and reported on Current Results. In the event of a tie for the coldest or warmest city in a particular ...
Severe weather statement SVS – A statement issued to provide updated information for active severe thunderstorm and tornado warnings to the public and emergency managers, with revised information including reports of observed severe weather and the approximate location of the storm cell (as indicated by the most recently updated NEXRAD data ...
Ian and Fiona, two of 2022's most catastrophic weather events, will no longer be used as names for tropical storms or hurricanes in the Atlantic basin, the World Meteorological Organization ...
Top weather news for Thursday, Feb. 20, 2025: Millions of people across the U.S. are on alert for dangerously cold temperatures in the wake of a deadly winter storm that raced … USA TODAY 8 ...
Tropical cyclones are named to avoid confusion with the public and streamline communications, as more than one tropical cyclone can exist at a time. Names are drawn in order from predetermined lists, [1] and are usually assigned to tropical cyclones with one-, three- or ten-minute windspeeds of more than 65 km/h (40 mph).