As many as eight tornadoes may have touched down west and south of Chicago, causing severe damage in several communities.
The National Weather Service has confirmed a tornado touch down in Coal City.
A viewer captured on video a funnel cloud near Mendota, Illinois.
The tornadoes created heavy damage across a large area and knocked out power to tens of thousands of people.
A storm chaser recorded the video below of a funnel cloud touch down in Illinois City, near the Illinois-Iowa border.
It was spotted at about 7:20 p.m. Monday.
At least five homes were damaged and no injuries have been reported.