Ski-mountaineering in the Pacific Northwest I am frustrated that the snow pack isn't refreezing at night.
There is about a 20F difference between the day and night temperatures in Seattle. Looking at forecasts for Mt. Rainier and Mt. Baker, the night temperature looks to be the same or sometimes even warmer. I think I have seen these kinds of forecasts even when the sky is clear, when I would expect the snow pack to release a lot of longwave radiation.
What is going on here?