Chicago is supposed to get 1-2 inches. Normally we are the ones getting a foot. Chicago is also way better conditioned with dealing with it. There are so many cars moving here that roads don’t pile up with snow like other places. And, the road crews are used to dealing with it.
St. Louis has a much harder time for the opposite reasons. I remember driving down to St. Louis during the last big storm and forgot how bad it can get there. Total white out condition. But, for people north of STL in Illinois, it gets even worse. Fewer plows and vehicles. It can be downright treacherous out there.
Anyway, be safe! Enjoy the snow if you can. I always like walking around in it when it is fresh and still coming down. That atmosphere is so unique.