You found the side of the Whites that probably rained and then frozen with an inch of glop in between. The interesting thing with anafrontal or frontal waves like that is the entire event is NW wind in the lowest 8,000ft in this one. Backside of the cold front and had strong inversion/veering around 6-8k feet.
Here’s the VAD from BTV yesterday during synoptic snow showing the flow behind the cold front.
That flow is kind of blocked which is why the west slopes locally and I bet Alex did a little better daytime yesterday than your hood… but last night it unblocked itself when upper winds also went NW and CAA took place. Froude numbers were 1.0-1.5 which is crest and Lee side favored… and your snowfall went off (similar thing happened at the ski area here). Basically the upslope could drift more eastward.
Couple that with -15C to -18C at 850mb with those perfect snow growth temps situated right in the sweet spot for orographic snow from 3,000-8,000ft elevation and it just dumped dendrites. When the snow growth is that good, even in high winds it doesn’t seem to shatter the flakes. They make it to the surface as great fluff. Can turn an extra 0.25” QPF into 6-10” fast.
Fun event!