That's day 7, by the way.
Two questions...
1. How cold will it get?
That depends on how long it takes to move the trough along the BC/WA/OR coasts (associated with the SSW digging vort-maxes) down south and east of the region. If it moves out quick enough, the brunt of the cold air will come straight down over Seattle and Portland. I'm banking on a slower solution, allowing the modified remains of the cold air to punch their way in. Seattle will probably have at least a day or two with highs below 35°F, and lows in the lower-to-mid 20s. Portland... not sure yet. I'd guess next Sunday or Monday will have a high in the lower to mid 30s, with lows in the mid 20s.
2. Snow?
Definitely, probably, and maybe. Definitely in Bellingham. Probably in Seattle. Maybe in Portland.
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