Strong storms swept through the Pittsburgh area on Tuesday evening, prompting tornado and severe thunderstorm warnings. The storms left behind a trail of damage, knocking out power to tens of thousands of people.

Forecasters are warning that damaging winds, large hail, and even tornadoes could hammer the upper Midwest on Monday.

Tornado warnings have been issued for parts of Minnesota as multiple rounds of severe thunderstorms are expected across the central U.S. on Monday, some capable of producing damaging winds, large hailstones and strong tornadoes,