National Weather Service United States Department of Commerce

A couple rounds of showers and thunderstorms are expected on Sunday. The severe threat will mainly be with the afternoon round of storms with damaging winds being the main threat, but some localized gusty winds could occur with some of the morning activity.
Outside of the showers and storms, strong wind gusts are expected southeast of I-55 Sunday afternoon. Peak gusts of 45 to 55 mph are expected. Use caution if driving large profile vehicles.
A cold front will transition rain to snow Sunday night into Monday and generate strong northwest winds around 45-50 mph. These conditions will lead to blowing snow on Monday and cause hazardous travel conditions. Be prepared for morning commute impacts on Monday!
Here is a timeline on when rain will transition to snow across northern IL and northwest IN.