This event is lost on me so far. Still…
Looking for the perceived “wall” in the northeast; I don’t see it—not at the surface, 850 or 500. Certainly not a high enough wall for potent shortwave to overcome, with long wave spacing that has the span of the CONUS to amplify…850 cold anoms are on the back side of this; not out ahead over the northeast US or SE Canada. That’s a red flag arguing against suppression.
There’s also a flip flop in NAO conditions as the storm makes its closest approach, neg state to positive. Less confluence; warmer. It also means faster track. With that, I believe the 12z GFS seems like the best case scenario; snow-wise. I wouldn’t benchmark that as the most likely outcome.