National Weather Service United States Department of Commerce

Multiple rounds of showers and storms are expected through Thursday night, some of which could be severe. The greatest severe threat is on Tuesday. Strong winds gusting 30 to 40 mph are also expected Tuesday. #ilwx
There is a slight (20%) chance isolated thunderstorms will develop this evening along a stationary front. If those develop, they could turn severe and produce large hail and damaging winds.
The threat of severe weather will increase on Tuesday, with a level 3 risk in place over west central Illinois as far east as Havana. Storms in this area are expected by mid to late afternoon. A level 2 risk covers most of the remainder of central and eastern Illinois, especially during the evening. The best chances of any stronger tornadoes or very large hail correspond with the level 3 risk. Keep a close eye on the weather on Thursday, and know where you would go if severe weather approaches your area.