Eastern Washington will get out of the endless deep freeze.
Portland will finally warm up enough to rid itself of the icy roadways that have has made driving like a segment of Ice Road Truckers.
Western WA will lose the blue skies and bright sunshine that has been so pleasant for suffers of Seasonal Affective Disorder.
And tragically, Cascade skiers, particularly on the lower slopes, will give up powder conditions for the familiar Cascade Concrete.
Will the History Channel film a segment in Portland?
And there is a major threat tomorrow and in the Columbia Gorge: an ice storm from freezing rain.
The origin of our unusual cold has been persistent high pressure east of the Cascades that has brought cool, dry easterly flow over much of the region. A disturbance going south of that high gave Oregon the snow earlier this week.
To show you the changes, here are upper level (500 hPa) maps that illustrate the change. In the first (for 4 AM Monday), an upper-level ridge is right over us, resulting in dry weather over the region.
A HUGE change is going to occur over eastern WA and Oregon, which has been locked in the freezer for weeks. To illustrate, here are the temperatures at Pasco for the past four weeks (yellow lines), with the normal highs and lows indicated by the red and blue lines. For virtually all of 2017, Pasco has been well below normal, with the highs on most days not even reaching the normal minima, and a number of hours below zero F.
Seattle is already in the mid-40s and it feels so mild.
And did I mention precipitation? We are going to be very wet for the next few days, with the latest high-resolution WRF run suggesting that over the next 72 h as much as 5-10 inches of liquid precipitation will fall in the mountains--most of the that will be rain, except for the higher elevations of the Olympics and north Cascades.
Over the next 7 days, the National GFS model forecasts suggest a LOT of precipitation along the West Coast (see below), with 5-10 inches being common over West Coast terrain. As I will describe in a future blog, the West Coast drought is history. Good for veggie prices next year.