This guy gives lots of charts and background for current situation, and warns tomorrow will be worse (at least around Seattle), but better on Tuesday.
https://cliffmass.blogspot.com/
"Even More Extreme: Extraordinary Record Highs Followed by Perhaps the Most Rapid Cooling in Northwest History
If you are living west of the Cascade crest of Oregon and Washington, tomorrow will be a day you will never forget.
The latest model runs, all at very high resolution, show even more profound extremes than previously predicted. And the end of the event will be extraordinary, with temperatures falling by as much as 50F within a few hours."
https://cliffmass.blogspot.com/
"Even More Extreme: Extraordinary Record Highs Followed by Perhaps the Most Rapid Cooling in Northwest History
If you are living west of the Cascade crest of Oregon and Washington, tomorrow will be a day you will never forget.
The latest model runs, all at very high resolution, show even more profound extremes than previously predicted. And the end of the event will be extraordinary, with temperatures falling by as much as 50F within a few hours."