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Thunderstorms rumble across southern Minn.

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A massive line of powerful thunderstorms will rumble from Iowa to Maryland on Wednesday, packing hail, lightning and tree-toppling winds, the Associated Press reports.

Meteorologists warn that the continuous line of storms may even spawn an unusual weather event called a derecho, a massive storm of strong straight-line winds spanning at least 240 miles, the AP reports. Wednesday's storms are also likely to generate tornadoes, followed by hot weather, the AP reports.

In Minnesota, a cluster of showers and thunderstorms will move east across the southern part of the state Wednesday morning, MPR's Updraft blog says.

Strong winds are possible, especially south of the Minnesota River, KARE 11 reported. The action likely will be heaviest in the morning before storms become more scattered this afternoon, KARE says.

The National Weather Service forecast for Minneapolis on Wednesday: Showers and thunderstorms, mainly before noon. High near 78. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.

Thursday: Mostly sunny, with a high near 78. WCCO says Thursday will be the nicest day of the week. Thunderstorms are possible this weekend.

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