Severe thunderstorms rolled across the central U.S. on Monday, producing damaging winds, large hailstones and at least one tornado. And the system is forecast to bring the same threats to more than 50 million Americans from Texas to New York on Tuesday.

Monday is probably the peak, but a storm risk shifts eastward Tuesday. Cities in the highest risk for tornadoes include Minneapolis and Rochester in Minnesota.

Millions in the Upper Midwest face the possibility of a severe thunderstorm outbreak Monday—the start of several days of extreme weather threats across the country this week.