Lake enhancement showing up fairly well now across SE WI and NE IL, from about Port Washington down to Waukegan.
It's evident when lighter synoptic returns are in the area, and heavier returns are limited to within a county of the lake.
Just went out for a drive, and conditions were as expected.
Probably the best period of snow I've see since the Nov 25-26th 2018 winter storm, and before that back in 2015.
Obviously has been just about all snow in much of the Chicago metro thus far, but the R/S line is finally crashing south of RFD and west towards Rt 47, for other portions of the LOT CWA.
It's not subsidence. More of the issue with drier air flowing in from the east across NE IL.
Further west across the DVN this issue doesn't exist, due to less dry air at the start.