Kind of an interesting image here. If you look closely you can see sort of a U-shaped boundary between heavier snowpack and lower snowpack. I remember seeing a feature move south on radar yesterday, almost looked like an outflow boundary moving south against the northward moving precip at the time. It was the transition from rain to snow, where sort of a cold pool had made it down and had changed the precip over to all snow at the surface. Looks like it made it down to about where those arrows are.