Both Minnesota and Wisconsin were hit by tornadoes during Monday night's severe storms, the National Weather Service confirmed.The first hit Kenyon, Minnesota, in Rice County around 5:55 p.m., according to a storm report.

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.