All About Derechos

Posted by on Monday, November 21, 2016

A derecho is a line of intense, widespread, and fast-moving windstorms and sometimes thunderstorms that moves across a great distance and is characterized by damaging winds.

These very damaging wind storms can cause hurricane-force winds, tornadoes, heavy rains, and flash floods.

Derechos occur mostly in summer, especially during June, July, and August in the Northern Hemisphere, within areas of moderately strong instability and moderately strong vertical wind shear.

The derecho that struck Chicago, Illinois on 11 July 2011 left more than 860,000 people without electricity.

The June 2012 North American derecho took out electrical power to more than 3.7 million customers starting in the Midwestern United States, across the central Appalachians, into the Mid-Atlantic States during a heat wave.



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