A nice flow of cool polar maritime air is headed out of the Gulf of Alaska…into the Pacific Northwest. A cold front is getting organized (slightly) around 130W right now. It's actually more of a solid line of showers than a large area of solid precipitation. This arrives over us mid-morning tomorrow. The combination of the showers, cloud cover, and colder atmosphere arriving overhead should give us a very chilly day Thursday. This is a "one-shot" deal for rainfall; the rain is gone by tomorrow evening, replaced by a much drier northerly low-level flow. This means more sunshine for Friday, and of course a chilly start Friday morning as well.
It still looks good for a frost most areas Friday night, at least for most areas that don't get frost tomorrow night. Okay, I'll make a few predictions for lowest either Friday or Saturday morning: HIO=27, PDX=34, VUO=30, TTD=32. Anyone else want to take a stab at it?
We should get a pretty quick rebound of temps Saturday PM through Monday as 850mb temps rise and we get a little offshore flow. Dry weather until at least Tuesday when westerly flow sags back down over the Pacific Northwest. Right now next week's systems are looking pretty weak and nothing to write home about, although the Mark Nelsen Vacation Rule applies for next week. Maybe a surprise storm? Mark