Well, it certainly is interesting... The one thing I notice the most is the very dry air in the low levels, with dewpoints down to nearly -20F in southern Ontario, to around -6F or so in lower MI. Usually, this tends to stop significant snows in it's tracks. On the other hand, the latest 18Z ETA and GFS have bumped up QPF across this region to nearly 0.50 inches, and with a nice ratio of 1 to 20 or 1 to 25 would mean nearly a foot of snow for quite a few places. Supporting that would be the weak stability in the lower mid levels, as well as a very strong TROWAL that lingers around between 700-500mb in the >80% humidity layer and good vertical velocity through tomorrow afternoon which to me would point to mesoscale banding of snows. Again though, it's highly dependant on whether or not the dry low level air can be over come, so certainly not an easy forecast. I would tend to go middle of the road and call for around 6 inches, but if it appears that the low level dry air won't be too much of a problem, I would say 8-12 inches.
