Derecho

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  • Publicado : 27 de febrero de 2011
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A derecho (from Spanish: "derecho" meaning "straight") is a widespread and long-lived, violent convectively induced straight-line windstorm that is associated with a fast-moving band of severethunderstorms in the form of a squall line usually taking the form of a bow echo. Derechos blow in the direction of movement of their associated storms, similar to a gust front, except that the wind issustained and generally increases in strength behind the "gust" front. A warm weather phenomenon, derechos occur mostly in summer, especially June and July in the Northern Hemisphere. They can occur atany time of the year and occur as frequently at night as in the daylight hours.

Derechos come from a band of thunderstorms that are bow- or spearhead-shaped on radar, and hence are also called a bowecho or spearhead radar echo. The size of the bow may vary, and the storms associated with the bow may die and redevelop. Winds in a derecho can be enhanced by downburst clusters embedded inside thestorm. These straight-line winds can exceed 100 mi/h (160 km/h) (in some cases, sustained wind) in these clusters and straight-line wind gusts of up to 200 mi/h (320 km/h) are possible in the mostextreme cases.[citation needed] Tornadoes sometimes form within derecho events, although such events are often difficult to confirm due to the additional damage caused by straight-line winds in theimmediate area.

On the other hand, with the average tornado in the United States and Canada rating in the low end of the F/EF1 classification at 85 to 100 mi/h peak winds and most or all of the rest ofthe world even lower, derechoes tend to deliver the vast majority of extreme wind over much of the territory in which they occur.[citation needed] Data compiled by the United States' National WeatherService and other organizations shows that a large swath of the north-central United States and presumably at least the adjacent sections of Canada and much of the surface of the Great Lakes can...
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