Steamy air from the south mixed with cooler air further north, producing another round of severe storms, Accuweather.com reported.
On Tuesday, a strong storm across parts of central Indiana flooded streets, knocked out power and dropped baseball-sized hail on Indianapolis.
There were no reports of serious injuries but several major streets in downtown Indianapolis were temporarily flooded. Indiana Power and Light reported more than 8,300 customers were without electricity Tuesday evening, the Indianapolis Star said.
In Clayton, Mo. Anne Craver returned home Tuesday afternoon to find a 100-year-old oak tree on top of her house with two of its branches sticking through the ceiling of her family room.
"I wanted to bring nature inside, but this is ridiculous," Craver told the St. Louis Post-Dispatch.
Damage and power outages were reported throughout the St. Louis metropolitan area.