A line of powerful thunderstorms hammered the Midwest Monday afternoon into Monday night, leading to at least one fatality as winds howled over 100 mph.

What is a derecho?

A derecho is a long-lived complex of thunderstorms that produces widespread wind gusts over 58 mph over an area at least 400 miles long. The Midwest is one of the areas of the United States where derechos occur most frequently, although they can occur in other parts of the country as well.

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