Storm System Threatening Millions In Midwest Could Spawn Feared Derecho

Source: Sophia Rosenbaum / NBC News

A storm system brewing over the Midwest threatened tens of millions of people Wednesday with heavy rain, hail and perhaps even a derecho — a rare, explosive wind pattern that forecasters compare to the landfall of a hurricane.

Chicago, Detroit and Cleveland were all in the threat zone, with Pittsburgh, Baltimore and Washington at risk of severe storms on Thursday.

“This is a particularly dangerous situation,” the National Weather Service said in an alert.

The weather service issued a tornado watch for parts of Iowa, Illinois, Minnesota and Wisconsin. Besides tornadoes, it warned of 80-mph wind and 3-inch hail.

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