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.

The National Weather Service confirmed six tornadoes touched down in Wisconsin during severe storms that swept through Monday night and early Tuesday. In Eau Claire County, four EF-1 tornadoes were confirmed, causing structural damage and leaving a path of destruction that stretched east of Augusta.

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.