I learned of Pinkham Window while snowboarding at Wildcat many years ago, when I commented on the phenomenon to a patroller who identified it. It's a hole in thick cloud cover that just hangs over the notch. Both Wildcat Ridge and the Presidentials are socked in, but the hole remains. In the afternoon, the sun shines through and directly hits the slopes while snow lightly falls. I've experienced this several times over the years.
So, in meteorological speak, what's going on?