Thunderstorms with the potential for heavy rain, high winds, and lightning are speeding toward Illinois from Nebraska and Iowa and are expected to hit the Chicago area around midnight.
The areas most in danger for severe weather are south of Int. Hwy. 80, with wind speeds approaching 60 mph and rainfall exceeding 2 inches, according to the National Weather Service.
But much of the Chicago area will also likely see some thundery downpours as the storm moves southeast.
The storms are expected to linger into Wednesday morning, the weather service said.
Late this afternoon, the National Weather Service warned of dangerous swimming conditions at beaches because of rip currents all day Wednesday.
Severe storms pounded parts of the central United States on Tuesday, producing baseball-sized hail, unconfirmed reports of several tornado touchdowns and a line of intense, dangerous winds known as a derecho, weather forecasters said.
Strong winds and baseball-sized hail caused widespread damage north of Omaha, Nebraska, Washington County officials said.
Storm chasers reported at least eight unconfirmed tornado touch-downs in Nebraska, one in Iowa and another in Wyoming, the National Weather Service said.