Chicago NWS snippet
Forecast soundings have continued to show that a rain and snow would
be the dominant precipitation types with a sharp gradient separating
the two p-types across the area. Recent trends have stared to hint
at the idea that areas north and west of I-55 would be the most
favored for snow and potentially heavy snow as the aforementioned
enhanced forcing interacts with it. Given that surface temperatures
are forecast to be around freezing the snow would likely be a wet
snow with ratios on the order of 8:1 to 9:1. While it is still too
soon to narrow down the exact location of where this heavy snow band
would set up it is looking like areas under this band could see
accumulations in excess of 3 inches which would lead to hazardous
travel conditions during the day on Friday, but especially during
the afternoon hours.