Severe weather is possible in the Tri-State on Wednesday, but it's far from a sure thing. Here's what the National Weather Service is saying about the forecast. The most likely timeframe for severe weather in Evansville and Henderson is between 2 p.m. and 5 p.m.

The area at risk for tornadoes on Wednesday includes Chicago, but the threat is most likely away from the city and east of Lake Michigan, Mr. Lyons said. St. Louis, which experienced a deadly tornado outbreak last month, is also under some risk, but the conditions are expected to be different and far less severe than what they were then, he said.

Severe weather moved through much of Maryland Wednesday evening, prompting Flood and Thunderstorm Watches. Stormy weather is expected to return Thursday evening.