$11 billion in damage from last summer’s derecho: ‘Historically it produced the most damage in the least amount of time.’

Starting on Aug. 10, a speedy line of storms with remarkable endurance covered 770 miles in 14 hours. Beginning in southern South Dakota and hitting gusts higher than 90 mph, the derecho flattened millions of acres of crops, tipped over semitrucks and snapped trees apart on its path toward Ohio.

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