What is a derecho?

Published On: Jun 13 2013 10:27:06 AM CDT   Updated On: Jun 30 2013 07:14:45 PM CDT

Duh-what-choo? Find out more about the possible derecho threatening millions of Americans.

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A derecho is a widespread, long-lived wind storm associated with a band or shelf of rapidly moving thunderstorms. They arise when huge downbursts of cold air hit the ground, spawning winds that spread out in straight lines from the point of impact.

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