Duh-what-choo? Find out more about the possible derecho threatening millions of Americans.
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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iStock / Terraxplorer
Antenne Réunion/linfo.re via CNN
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