A Ice Storm Warning applies to Cook and surrounding counties from 6 p.m. Tuesday to 6 a.m. Wednesday.
"During the transition, please pay extra attention and allow more time, as bridges and overpasses may get slick sooner".
Freezing rain possibly mixed with sleet and wet snow early in the process will overspread most of the Chicago area tonight into early Wednesday morning, beginning in the westernmost sections later this afternoon.
A mix of patchy freezing drizzle, light freezing rain and snow is possible Thursday, the National Weather Service said. Winds NE 5-10 miles per hour. Highs will be stuck in the 20s possibly low 30s for highs.
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Periods of drizzle could continue into overnight, when the fog returns. Untreated surfaces across the region will be icy and slippery, and driver are encouraged to drive according to those conditions. The likelihood of precipitation is low but that would be the likely precipitation type IF precipitation were falling. "Likely up to 0.5" with most spots just getting flurries if any snow at all.
Sunny skies arrive Tuesday morning with a few afternoon clouds as high pressure moves into the region.
Tuesday is expected to be quiet with highs near 40 degrees.
TODAY: Mostly Cloudy High: 27 Wind: NE 10 miles per hour TONIGHT: Icy Mix.