The National Weather Service has confirmed tornado touchdowns near Tomah and Mauston, with power knocked out to more than 70,000 customers Wednesday evening.
Damage was done to the Mile Bluff Medical Center in Mauston with trees and powerlines known down near the hospital.
In the middle of the severe storm, a crash on Interstate 90-94 closed eastbound traffic at about 4:30 p.m.
State Highway 21 was also closed to traffic in both directions by a crash.
City officials in Green Bay were asking people to stay away due to extensive damage from storms.
Authorities have provided no injury reports yet.
A tornado watch for seven counties in eastern Wisconsin will be in effect until 10:00 tonight.
