What is a derecho?

Published On: Jun 13 2013 10:27:06 AM CDT

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

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To be classified as a derecho, the swath of wind damage must extend more than 240 miles, and winds must be greater than 57 mph. Derecho winds can range well beyond 100 mph.

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