CHICAGO — Showers and thunderstorms that dumped heavy rainfall across the Chicago area, leading to flooding that swamped streets, also produced two possible tornadoes, the National Weather Service said.
Weather spotters reported that one tornado touched down Sunday evening south of Sandwich in far northeast LaSalle County, and a second struck near Braidwood, along the Grundy County and Will County line, the weather service in Chicago said. Forecasters said no damage was reported from either storm.
The weather service in Lincoln said another tornado briefly touched down Sunday afternoon in central Illinois, and was intermittently on the ground as it moved through the Macon area, damaging some trees.
Floodwaters from Sunday’s storms swamped roadways overnight across the Chicago area, including Lower Wacker Drive, which officials temporarily closed. High waters there forced the Chicago Fire Department to send in boats to remove homeless people and motorists who had become trapped.
That flooding also sent water coursing into the Willis Tower’s basement, affecting a ComEd substation. ComEd was working with the city and Willis Tower officials to assess the situation.
A flood warning issued by the weather service remains in effect across the Chicago area and much of northeastern Illinois and parts of northwestern Indiana until early Monday afternoon.