Winter Weather Advisory Issued for Select Chicago Area Counties – NBC Chicago

A winter weather advisory has been issued for several Chicago-area counties ahead of a winter system that will bring “dangerous” snow accumulation and travel conditions to parts of the region.

The advisory was issued for LaSalle, Kendall, Grundy, Kankakee, southern Cook and Will counties in Illinois, along with Lake and Porter counties in northwestern Indiana.

It begins at midnight CST and continues through 6 p.m. Wednesday, warning of 2- to 4-inch snow accumulations and “slippery” road conditions that could make Wednesday morning travel hazardous.

Another advisory for Newton and Jasper counties in Indiana will be in effect for the same amount of time, warning of 3 to 5 inches of accumulation.

Forecast models show the system traveling upward from the south, bringing with it intermittent accumulated snowfall overnight Wednesday.

According to the National Weather Service, “deteriorating travel conditions are expected during the Wednesday morning drive,” with peak snowfall rates in the morning hours.

However, by lunchtime, forecast models show that snowfall rates are declining. In addition, temperatures are expected to rise, reaching 30 degrees.

The system marks a return to typical January weather for the Chicago area, as the NBC 5 Storm Team notes that the region is experiencing a snow deficit, at nearly a foot below average.

While the Chicago area is likely to see area-wide snow, the highest totals are expected in areas south and east of the city.

According to the NBC 5 Storm Team, northern counties are expected to see less than two inches, while southern and southeastern suburbs could see up to four inches, with up to five inches in northwestern Indiana.

By Wednesday night, the system is expected to begin moving out of the Chicago area. However, due to the warm waters of Lake Michigan and winds moving from the north, a round of lake-effect snow could impact areas south of the lake in northwestern Indiana.

As a result, parts of Indiana could see locally higher snowfall totals by the time it’s all said and done Thursday morning, according to forecast models.

Another round of winter weather could arrive Friday in the form of a fast-moving mower system, which could bring light snow or some mixed precipitation to the area. Accumulations will most likely be lighter with that disturbance, based on forecast models.

Late on Saturday and into Sunday, more snow showers are expected to fall as two air masses collide with each other, according to forecast models. Light snow is likely to result from those air masses as they pass over the Midwest, bringing some additional accumulations to areas that will have seen snow over the course of several days.