CHICAGO (CBS)-- Snow is on the way. 

A Winter Weather Advisory is in effect through Wednesday at 6 p.m. The advisory will cover areas south of the city and Northwest Indiana. That advisory could be expanded northward, depending on the track of the storm. 

Two to 5 inches of snow are possible, with highest snow totals in southern areas. Central Illinois and Indiana can expect the bulk of the snow, as much as eight inches.  The snow is expected to start to accumulate around the Chicago area sometime between 2 a.m. and 5 a.m. on Wednesday morning.

 The heaviest snowfall is expected to continue until midday, according to the National Weather Service. Lake effect snow is likely to continue into the evening. 

Hazardous conditions will impact Wednesday morning commuters with slick road conditions and low visibility. 

Ahead of the snow, Tuesday's temperatures will be in the 30s with cloudy skies. 

Temperatures drop to the 20s by the weekend.