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What is a derecho?

POSTED: 08:27 AM PDT Jun 13, 2013 

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

severe weather, lighting, storm file photo
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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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