Overall, its going to be a soggy, windy, and potentially wintry day. Rain has been lifting north this morning as dynamic low pressure moves out of the plains and closer to Illinois. With the Stateline remaining on the north side of the low, there is potential for a bit of wintry weather. If the system can cool itself, there would be the potential for the rain to mix with or transition over to all snow late this morning, but also late this evening. Any accumulations should be minor, and the best chance of slushy accumulation would be east of Rockford. Roads could turn a bit slushy, and visibility will be reduced at times. You'll want to watch for reduced visibility and some ponding with the rain as well, because will will turn moderate to heavy at times. It will be a good idea to keep rain boots, a coat, and an umbrella handy today. Rain totals have the potential to add up to around 1-2" by tomorrow morning.
Along with wet and potentially wintry conditions, it will be windy and raw feeling. Temperatures will be stuck on either side of 40° and northeast winds will be on the stronger side. Winds this afternoon will be sustained between 15-25mph and will gust up to 35mph. But, tonight they will strengthen as the low strengthens, and peak wind gusts for the Stateline will reach near 40mph. If you are headed into the Chicago area, you'll want to watch for potential lake shore flooding along with high waves off the lake, and some peak wind gusts near 55mph through Thursday.
The rain/wintry mix will be east of Rockford by commute time tomorrow morning and clouds will slowly break up from west to east. High pressure arrives Friday which helps to clear the clouds, and provides a lot of sunshine through the afternoon. Temperatures will warm into the weekend, climbing into the upper 60's to near 70° with breezy southerly winds.