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Derecho windstorms could sweep the midwest: Who is in its path?

Derecho windstorms can blow 75 mph winds for hours, across vast distances. This derecho could affect Milwaukee, Chicago, Detroit, Cleveland, Pittsburgh, and maybe Washington, D.C.

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This infographic from the National Weather Service shows how often different regions can expect to experience a derecho windstorm. The term 'derecho' comes from the Spanish for 'straight ahead,' as the storms can produce tornado-like damage from essentially straight-line winds.

Courtesy of the National Weather Service / NOAA

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The National Weather Service was tracking a so-called derecho weather pattern in the Midwest on Tuesday that could spawn severe windstorms in major metropolitan areas with gusts as strong as 100 mph.

Derecho windstorms occur once every year or two across the central and northeastern U.S. in a band from Texas to New England. They pack hazardous winds of at least 75 mph or more and maintain their intensity for hours as they sweep across vast distances.

In some cases a derecho will spawn tornados and accompany storms that produce hail the size of golf balls.

The current pattern could affect larger metropolitan areas in Milwaukee, Chicago, Detroit, Cleveland and Pittsburgh in the next two days, said Bill Bunting, a meteorologist in the agency's storm prediction center in Norman, Okla.

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