Across northern Illinois including the Chicago area, the southeast corner of Wisconsin, northern Indiana and much of Lower Michigan a band of heavy wet snow - in general 3 to 5 inches is expected to fall Tuesday. As northeast winds strengthen - gusting well over 40 miles per hour - precipitation in the Chicago area could start out with a sleet/snow mix by midday Tuesday and then change over to a heavy wet snow later in the afternoon. Snow will accumulate along with blowing and drifting during the late afternoon and evening - then taper off somewhat later at night or early Wednesday. Along and inland of the Illinois Lake Michigan shoreline, the strong winds off the lake may enhance snowfall - with additional accumulations possible.
An intensifying center of low pressure was expected to move out of north-central Texas through Arkansas today and then northeast up the Ohio River Valley through southern and central Indiana Tuesday reaching the Lake Erie area early Wednesday. North of this storm track, a mixture of snow and sleet with spots of freezing rain will gradually change over to an accumulating heavy wet snow.
Blizzard and Winter Storm Warnings for 12 to 18 inches of blowing and drifting snow from the Texas panhandle through portions of Kansas and Oklahoma today and early Tuesday. A Winter Storm Warning for 10 to 15 inches of blowing and drifting snow is in effect for portions of eastern Kansas into western Missouri, and a similar warning for 6 to 10 inches in eastern Missouri into west-central Illinois late tonight into Tuesday.
Once the low center moves well east of us over northern Ohio, a strong north to northwest flow on the back side to the low will create additional lake-effect snows in northern Indiana and Lower Michigan later Wednesday.
Below is a map depicting the Blizzard Warning (orange), Winter Storm Warnings/Advisories (light pink and purple), and Winter Storm Watch (greenish-blue) areas.