If the NAM is wrong here it's not wrong bc of a bias it's wrong bc of how it handles the trough.
Long duration SW flow, no closed mid level lows, unimpeded ML WAA aren't a great recipe to stay all snow.
And that's the fun part. People are just looking at ptype map colors and screaming about it being right or wrong and not even truly analyzing 500mb.
That was the part of my "if it showed snowier, but looked the exact same at 500mb."
At least some have mentioned the 850 low being open/closed in there.