There's a huge band of snow between Normal and Carbondale, and it's rain south of Carbondale to Memphis. Looking out the window, we've got a dusting that doesn't cover the grass. It other words, Bloomington-Normal is right at the northern edge of the snow with a few stray flurries falling-- at least as of now. I'll update midday Saturday. Having driven back and forth between Chicago and Normal once or twice a week for several years, I know that they're very good about keeping I-55 clear. But since the storm is south of Bloomington-Normal, it should't be a problem.
When I was making a drive, I used this site (
https://www.travelmidwest.com/lmiga/home.jsp )for extremely accurate road conditions and travel times down through just past I-80. Check it before you leave, and you can click on the camera icons to get a video of traffic and conditions.
Here is a valuable but slightly less accurate map for road conditions on the rest of the Interstates in Illinois:
http://wrc.gettingaroundillinois.com/pages/wrc.htmAs of this writing, the bad weather begins just south of Bloomington-Normal.