windstorm

/wind"stawrm'/, n.
a storm with heavy wind but little or no precipitation.
[1350-1400; ME; see WIND1, STORM]

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 a wind that is strong enough to cause at least light damage to trees and buildings and may or may not be accompanied by precipitation. Wind speeds during a windstorm typically exceed 55 km (34 miles) per hour. Wind damage can be attributed to gusts (short bursts of high-speed winds) or longer periods of stronger sustained winds. Although tornadoes (tornado) and tropical cyclones (tropical cyclone) also produce wind damage, they are usually classified separately.

      Windstorms may last for just a few minutes when caused by downbursts from thunderstorms (thunderstorm), or they may last for hours (and even several days) when they result from large-scale weather systems. A windstorm that travels in a straight line and is caused by the gust front (the boundary between descending cold air and warm air at the surface) of an approaching thunderstorm is called a derecho. Gustavus Hinrichs, a physics professor from the University of Iowa and founder of the Iowa Weather Service, applied the term derecho—a Spanish word that means “straight” or “right”—to straight-line winds in 1888. Derechos are capable of causing widespread damage and landscape devastation. For example, the winds of a derecho occurring in northern Minnesota, U.S., on July 4, 1999, peaked at or near 160 km (100 miles) per hour and blew down tens of millions of trees.

      Longer-period windstorms have two main causes: (1) large differences in atmospheric pressure across a region and (2) strong jet-stream (jet stream) winds overhead. Horizontal pressure differences may accelerate the surface winds substantially as air travels from a region of higher atmospheric pressure to one of lower. In addition, the vertical turbulent mixing of stronger jet-stream winds aloft can produce strong gusty winds at ground level.

      Intense winter storms are frequently the cause of long-lasting windstorms. Such winter low-pressure systems have large horizontal pressure differences and are always accompanied by strong jet-stream winds aloft. In the northeastern United States, windstorms that occur as particularly strong low-pressure systems and move northward along the Atlantic Coast are called “nor'easters.”

      Cold (cold front) fronts (front) associated with such intense low-pressure systems can produce windstorms both as they pass and for a period afterward as colder air flows overhead. Such movement of cold air aloft is particularly effective at causing the downward mixing of jet-stream winds. Windstorms create dust storms and sandstorms in arid and semiarid regions. In North Africa, these cold frontal windstorms are often referred to as haboobs (haboob).

       blizzard conditions can occur when the windstorms pass over snow-covered ground. The U.S. National Weather Service issues blizzard warnings when sustained winds or frequent gusts are forecast to be 56 km (35 miles) per hour or greater for at least three hours with sufficient blowing snow to reduce visibility to less than 400 metres (1,300 feet). This type of windstorm also produces dangerous wind chills (wind chill). A wind speed of 55 km (34 miles) per hour with an air temperature of –6.5 °C (20.3 °F), for example, produces a loss of body heat equivalent to what occurs in calm winds with an air temperature of –29 °C (–20.2 °F). When cold fronts pass over mountains, cold air accelerates even more as it moves downslope. Downslope winds are called fall winds or katabatic winds (katabatic wind). Windstorms of this type are called boras (bora) or downslope windstorms.

 Warm air flowing poleward to the east of intense low-pressure systems can also produce windstorms. In North Africa and the Arabian Peninsula such a windstorm, called khamsin, can transport large amounts of dust and sand northward. When the winds blow over mountains, the warm air is heated even further by compression as it moves toward lower altitudes. A strong, warm windstorm is called a chinook in the northwestern United States and southwestern Canada, a foehn in the European Alps, and a zonda in the Andes Mountains of Argentina. In 1972 a chinook in Boulder, Colo., U.S., produced a wind gust that briefly reached 215 km (134 miles) per hour and caused extensive damage. Locations adjacent to large mountain barriers in the middle and higher latitudes are noted as being particularly vulnerable to downslope windstorms. At lower latitudes these intense low-pressure systems and the associated wind effects of a strong jet stream do not normally occur.

Roger A. Pielke, Sr.
 

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Universalium. 2010.

Look at other dictionaries:

  • Windstorm — Wind storm, n. A storm characterized by high wind with little or no rain. [1913 Webster] …   The Collaborative International Dictionary of English

  • windstorm — [wind′stôrm΄] n. a storm with a strong wind but little or no rain, hail, etc …   English World dictionary

  • windstorm — UK [ˈwɪndˌstɔː(r)m] / US [ˈwɪndˌstɔrm] noun [countable] Word forms windstorm : singular windstorm plural windstorms a period of bad weather when there is a lot of wind but no rain …   English dictionary

  • windstorm — vėtra statusas T sritis ekologija ir aplinkotyra apibrėžtis Labai stiprus sausumos vėjas, trunkantis nuo kelių minučių iki kelių valandų. Dažniausiai būna su perkūnija ir krituliais (liūtimi ir kruša). atitikmenys: angl. storm; tempest; windstorm …   Ekologijos terminų aiškinamasis žodynas

  • windstorm — A violent storm characterized by the vehemence of the wind and its sudden changes. In order to amount to a windstorm, a movement of air need not have either the cyclonic or the whirling features which usually accompany tornadoes or cyclones, but… …   Ballentine's law dictionary

  • windstorm — noun Date: 14th century a storm marked by high wind with little or no precipitation …   New Collegiate Dictionary

  • windstorm — noun A storm in which there are strong, violent winds but no precipitation …   Wiktionary

  • windstorm — Synonyms and related words: black squall, blizzard, blow, cyclone, dirty weather, equinoctial, foul weather, gale, half a gale, heavy blow, hurricane, ill wind, line squall, line storm, rainstorm, rough weather, snowstorm, squall, squall line,… …   Moby Thesaurus

  • windstorm — wind|storm [ˈwındsto:m US sto:rm] n a period of bad weather with strong winds but not much rain …   Dictionary of contemporary English

  • windstorm — wind|storm [ wınd,stɔrm ] noun count a period of bad weather when there is a lot of wind but no rain …   Usage of the words and phrases in modern English

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