A Winter Weather Advisory goes into effect at midnight and lasts until 6 p.m. Wednesday for Cook, Boone, De Kalb, DuPage, Lake, Kane, McHenry, Kankakee, Kendall, Will, LaSalle, and Livingston counties in Illinois and Jasper, Lake, Newton and Porter counties in northwest Indiana.
The advisory has been extended to midnight for several counties in northwest Indiana, due to the possibility of lake effect snow.
Areas under the advisory could see 2-5 inches of snow, but ABC7 Meteorologist Greg Dutra said warming temperatures during the day could cause there to be periods of rain/snow mix.
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Chicago itself is expected to get about 2 to 3 inches of snow, possibly 4, Dutra said.
Areas not under the advisory could see 1-2 inches of snow, with isolated spots seeing 3 inches of snow.
Snow is expected to begin in the southern suburbs between 2-4 a.m. and move toward the city starting around 5 a.m.
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The most challenging travel conditions are expected between 6-11 a.m. Wednesday, with snow diminishing through the later part of the afternoon and evening.