I think it's blocked and the trajectory of the precip moving almost due north. Probably helps to have a strong thermal gradient in there too as the cold can come into the Champlain Valley and west slopes unmitigated (it's already cooling down near freezing in the Champlain Valley). It takes a bit more for that low level cold to cross the barrier, so likely more mixed or non-snow precip to start.
ECMWF and ICON are definitely a bit further east with the precipitation, but I think synoptically it would make sense for the western slopes or even Champlain Valley to wring out the moisture better. A lot of low level fog and mist around right now, feels like the low levels are juiced.
Seeder feeder with mid-level lift and then low level orographic juice too.
I will say it is inverted at the ski area right now.
36F at 3,600ft
38F at 2,600ft
32F at 1,500ft