The National Weather Service confirms that at least one tornado barreled Friday night through portions of the St. Louis area as part of a storm that damaged dozens of homes but caused no serious injuries.
The weather service's Jayson Gosselin says the twister that hit portions of St. Charles County was an EF-3, which has winds between 136 and 165 mph. A tornado of that magnitude also has been confirmed to have affected the Roxana area in Illinois' Madison County, northeast of St. Louis.
Gosselin says crews are trying to determine if damage in St. Louis County was also from a tornado.
Missouri Gov. Jay Nixon has declared a state of emergency.
Ameren says 83,000 homes and businesses it serves around St. Louis were without power as of midday Saturday.