First, this is showtime for NW Washington as a band of precipitation overuns the cold air coming out of the Fraser. It is now snowing at Bellingham and Orcas Island. NE winds have strengthened...to 30 mph at Bellingham Airport.
The latest computer forecasts (initialized at 10 AM this morning) are more threatening for Monday...but lets view tonight's runs before we jump to conclusions. We will have cold enough air...the question is precipitation. The classic situation is to have a significant upper trough move southward in northerly flow...the new runs are suggesting this....but lets take some time to analyze the situation...and also look at the ensemble forecasts, which are becoming available for the time of potential lowland snow.