- 行业: Weather
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The American Meteorological Society promotes the development and dissemination of information and education on the atmospheric and related oceanic and hydrologic sciences and the advancement of their professional applications. Founded in 1919, AMS has a membership of more than 14,000 professionals, ...
A period of abnormally and uncomfortably hot and usually humid weather. To be a heat wave such a period should last at least one day, but conventionally it lasts from several days to several weeks. In 1900, A. T. Burrows more rigidly defined a “hot wave” as a spell of three or more days on each of which the maximum shade temperature reaches or exceeds 90°F. More realistically, the comfort criteria for any one region are dependent upon the normal conditions of that region. In the eastern United States, heat waves generally build up with southerly winds on the western flank of an anticyclone centered over the southeastern states, the air being warmed by passage over a land surface heated by the sun. See also hot wind.
Industry:Weather
A type of hoarfrost that is formed on the windward side of terrestrial objects and on aircraft flying from cold to warm air layers. Ice feathers are made up of single, columnar ice crystals, some of which grow out from others at large angles and thus build up a delicate spatial array of tiny crystals. See air hoar.
Industry:Weather
A type of radio antenna often used because of its directional properties and simple structure. It consists essentially of flared extensions of a metallic waveguide. Large horn antennas are used primarily in research applications to produce very narrow vertical or horizontal beams.
Industry:Weather
A type of hoarfrost that is formed on the windward side of terrestrial objects and on aircraft flying from cold to warm air layers. Ice feathers are made up of single, columnar ice crystals, some of which grow out from others at large angles and thus build up a delicate spatial array of tiny crystals. See air hoar.
Industry:Weather
The presence of south foehnlike conditions at higher elevations of the Alps while the lower elevations and the plains or “foreland” to the north are under a cold air mass. Under these conditions, the mountains are often warmer than the lowlands. The warming is attributed to subsiding air in a synoptic anticyclone above the cold surface air. Although the winds in the warm air are apt to have a southerly component, the high foehn does not necessarily have strong, gusty foehn winds. However, this situation often precedes the foehn at the surface.
Industry:Weather
The presence of south foehnlike conditions at higher elevations of the Alps while the lower elevations and the plains or “foreland” to the north are under a cold air mass. Under these conditions, the mountains are often warmer than the lowlands. The warming is attributed to subsiding air in a synoptic anticyclone above the cold surface air. Although the winds in the warm air are apt to have a southerly component, the high foehn does not necessarily have strong, gusty foehn winds. However, this situation often precedes the foehn at the surface.
Industry:Weather
The climate of a region where the typical vegetation is forest. The humid climate is one of Thornthwaite's humidity provinces.
Industry:Weather
The climate of a region where the typical vegetation is forest. The humid climate is one of Thornthwaite's humidity provinces.
Industry:Weather
