Just woke up to more model mayhem, lol.
I'll repeat what John Homenuk/earthlight said a few days ago and keeps repeating: this is an extraordinarily explosive, yet fragile setup with a very high ceiling and a very low floor (meaning, for example, anything from 1-12" or maybe even a wider range for 95 still being on the table). Anyway, the 6Z runs showed more snow from the RDPS/NAM and the GFS shifted west substantially (but it was an outlier to the east and still only gave 2-4" coast and an inch or so for 95), while the Euro, which had been rock solid for days on at least 6" for the 95 corridor (and sometimes more), shifted east a decent amount producing only 3-5" for 95 (5-8" coast/1-3" NW). With that as preamble, let's see what happens with 12Z today.
And we're off, with the 12Z NAM shifting east a bit with the surface low, but having a more expansive precip shield so its snowfall was about identical to the 6Z/0Z NAMs with about 4-8" for 95 (~6" on 95), 7-11" for the coast and 2-4" 20+ miles NW of 95. Should be another interesting day of tracking.
Next up is the RGEM/RDPS, a mesoscale short-term model (basically the Canadian version of the NAM), which is about the same pretty snowy solution as it was at 0Z and 6Z, showing 5-8" for 95, 7-10" for the coast and 3-5" NW.
First global model of the 12Z suite is the GFS, as usual, and it's a slight tick NW with the low and the snow, relative to 6Z, with the 1" line right along a line from Philly to NYC, with the 95 corridor being about 0.5-2", and with about 2-4" towards the coast and not much NW of 95. Still the least snowy model, but not a giant outlier anymore, as it wouldn't take huge changes for the other models to move to a GFS solution and it wouldn't take a huge shift for the GFS to go much snowier either - that's the "fragility" of this volatile setup.
The 12Z CMC shifted a bit east (seems like the trend so far at 12Z), but is still a significant snowstorm (5-8") for 95 and major for the coast (7-10"), but moderate for NW (3-5"). And the UK, after one run that was snowy last night, is back to a GFS like east solution, with only 1-3" for most of 95, 3-4" for the coast and an inch or so NW (and it has been really bad this winter).
And finally the 12Z Euro which is almost a carbon copy of 0Z last night and much snowier than 6Z, with 4-7" for 95, 7-10" for the coast and 2-4" for NW, so the mayhem continues.