But that is not all. A week ago we had a normal snowpack, with substantial snow at lower elevations east of the Cascade crest. But then the atmospheric circulation shifted so that warmer air flooded the region from the southwest. As an illustration, the observed and typical temperatures for Spokane Airport are shown below. Several recent days surged well above normal.
And it is not over yet. Here is the NWS GFS model total precipitation forecast for the next 7 days. Lots of rain over the Northwest (5-10 inches in the mountains).
There are going to be a lot of very happy ducks.