A lot to like if you're in and around Chicago on the 12z NAM. Mid/upper level lows all take a nice track for a band of heavy snow. Think I-80 to the border is going to cash quite nicely. I think most times, these systems like to bleed a little further north than forecasted. Read the overnight AFD from LOT, and they have the heaviest a little farther north...I-88 to far north central IL. And mainly rain from I-80 to the south. Again, I think it's more I-80 on north for the heaviest snows...and the changeover to all rain, after a brief start of frozen, looks solid for the southern CWA.