CHICAGO — The Winter Storm Warning for heavy snow over the counties along and north of Interstate-80 in northeast Illinois and northwest Indiana and Snow Advisory over Kankakee, Newton and Jasper Counties continues in effect until midnight tonight. As low pressure develops to our southwest and moves northeast, passing just to our west this evening, snow is expected to reintensify over our area this afternoon, gradually ending from the west later tonight.
Snowfall so far has been in the 2 to 4-inch range and an additional 3 to 6-inches is expected in the warned westernmost counties with as much as 4 to 8-inches additional snow possible in Chicago and easternmost parts of the Chicago area. Heaviest snow looks to be centered just to our east across northern Indiana into Lower Michigan. Those planning to travel today should still anticipate an up-tic in snowfall this afternoon and evening, so figure on a slow-go with snow-covered roads and slick conditions to redevelop/persist this afternoon into the overnight hours.
Taking a look at another source of heavy snow guidance, below is the latest outlook by the National Weather Prediction Center showing the probability of more than 4-inches of additional snow from 6AM CST Sunday until 6AM CST Monday. Note the Chicago-area western and southernmost sections are positioned in the 10 to 40% probability area, while eastern sections are in the 40 to 70% probability area.