Multiple Chicago-area counties were under a winter weather advisory early Wednesday as freezing rain could potentially impact the morning commute.
The advisories were issued for Cook, DeKalb, DuPage, LaSalle, McHenry, Kane and Kendall counties. In DeKalb and LaSalle, the alert takes effect at 4 a.m., while McHenry, Kendall and Kane counties began at 6 a.m. The advisories begin in Cook and DuPage counties at 8 a.m. and all continue through 12 p.m.
A dense fog advisory was also issued for Kankakee County in Illinois, as well as several counties in northwest Indiana: LaPorte, Newton, Lake and Jasper. That advisory lasts through 9 a.m. EST, warning of visibility of less than a quarter mile in dense fog, making for hazardous driving conditions.
Light freezing rain during the morning rush hour will ice roads, the National Weather Service said, before transitioning to all rain during the day.
The areas most likely to see icing are along and north of Interstate 80, according to the National Weather Service.
Total ice accumulations of a few hundredths of an inch are expected. The conditions could make sidewalks, roads and bridges "very slippery." Officials urged caution while traveling, particularly on untreated surfaces.
Temperatures Wednesday are expected to rise into the upper-30s for far northern locations and into the mid-40s south of I-80, Storm Team 5 meteorologists report.
Scattered rain showers are possible in the afternoon and may end as a light mix Wednesday evening.
Thursday looks to be much colder with temperatures only reaching into the mid- to upper-20s.