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 massive line of fierce storms forecast to wallop the Midwest and Mid-Atlantic on Wednesday and Thursday has meteorologists warning about the possibility of a derecho.

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