
A winter weather advisory will start to go into effect around midnight tonight for Green, Rock, Walworth, McHenry, Boone, Stephenson, Jo-Daviess, Carroll, and Ogle counties. Those will continue into the morning hours on Sunday as slick driving conditions are possible with the threat for freezing rain early on. Up north where temperatures are a few degrees cooler, you may see sleet or snow mixing in. Regardless, expect slick conditions tomorrow morning.
Taking a look at futurecast. We stop the clock at 7:00 AM and all of that pick shading is freezing rain. Freezing rain easily freezes on contact with any surface so roads will be slick early on in the morning. As temperatures slowly rise into the upper 30's-low 40's tomorrow, it will transition to mostly rain and a few rumbles of thunder are possible.
After the first wave passes through early tomorrow morning, we have a small break heading into the afternoon before more steady rain moves in after 4:00 PM. Overall, much of the area should see about a half an inch of rain from this system.

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