No injuries have been reported.
There were also reports of tornadoes downstate Monday.
About 3,300 Ameren customers remain without power after Monday night's storms.
The National Weather Service says it received three reports of tornadoes in St. Clair County and a fourth report from Calhoun County.
But officials say they won't know for sure until the surveys are completed.
Meteorologists say winds up to 65 mph and hail also hit Perry, Franklin and Williamson counties near the Kentucky border, uprooting trees, damaging buildings and toppling power lines.
The Associated Press contributed to this report.