The good news? Cold air is definitely moving in from the northwest. The bad news? Radar is definitely drying out.
Take a look at some of the “upstream” obs. Snow at Astoria with a strong west wind…down to 34 degrees now. Tidewater RAWS, just inland from Astoria at 2,000′? Dropped from 31 to 27 the last couple of hours, and I assume it’s even colder now at 6pm. That air advects right over us in the next two hours…so a 30 degree temp at the top of the West Hills is likely by 8pm. Note the dramatic drop in dewpoints too. All a good indication that the much advertised sudden cooling in the upper-atmosphere is now coming south out of Washington. And it’s getting even colder up there. I see Hurricane Ridge at 5,000′ is down to +1 degree! That very cold upper-level air is dropping south.
At the surface, all of Puget Sound has gusty northerly wind now at temps well down into the 20s. Arctic front passed Olympia and appears to be somewhere between there and Chehalis.
So will moisture stick around? I still would be surprised if we don’t get a dusting this evening at some point. But that one inch might be a stretch! We’ll see.
Still expect freezing temps by the time we get to 10pm or so. Watch out on roads that are still wet.
Chief Meteorologist Mark Nelsen