The metro-east is under a tornado watch until 1 a.m. Tuesday, according to the National Weather Service.
St. Clair, Madison, Monroe, Macoupin, Montgomery, Washington, Bond, Clinton and eight other Illinois counties are under the tornado watch.
A tornado watch is issued when conditions are able of producing a tornado. A tornado warning is issued when a tornado has been sighted.
About 2,300 residents of the Dupo and parts of Millstadt areas lost power as a result of storms early Monday morning. The storms caused damage in Belleville, Millstadt, Cahokia and other parts of the metro-east. Ameren crews had the power restored by Monday afternoon.
In Shiloh, high winds overnight blew down a large carnival-type tent on the grounds of St. Clare of Assisi Catholic Church that had been used over the weekend for the church's picnic.
Power was lost in west Belleville earlier when a tree fell across power lines. Outages in Cahokia and Millstadt were also reported around 4 a.m. Monday.
In Millstadt, the fire department and police department secured downed power lines on Jefferson Street. Near Belleville, the eastbound lane of Foley Drive was closed because of a tree falling into the roadway, according to police reports. A tree also stopped traffic on Illinois 140 near Holiday Shores.