6:00 PM Update: Cold Air Arriving

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

426 Responses to 6:00 PM Update: Cold Air Arriving

  1. Derek Hodges says:

    Via my family on the portland/gresham border.

    30.6 with snow on everything including the roads.

  2. W7ENK says:

    There it is! 32.0F in Milwaukie… MARK IT! 9:47p

  3. W7ENK says:

    WOW, it’s blizzarding! 33.3F, snowing moderately, and just had a random wind gust 23.7 from the NNW! Snowflakes and leaves swirling all over the neighborhood. 😀

  4. ne’er mind, make that a snow covered deck. Getting a nice dusting finally from this shower. 32.5

  5. Longview - 400 ft says:

    This is what I posted just under an hour ago:
    November 22, 2010 at 8:33 pm
    Currently 29.1
    Clearing skies.

    Now the temp is 24.4
    Baby it is cold outside!!!!!!!!

  6. Danny in Troutdale says:

    New post guys

  7. Matthew says:

    Northwest winds in southeastern Portland. Also a trace of snow is on all surfaces…

  8. front is reaching into vancouver now

  9. 32.9 now. Light snow drifting down, deck is getting sparkly.

  10. Robert in Hazel Dell says:

    SNOWING IN HAZEL DELL! Wow, in a matter of minutes, the wind shifted from SW to NW, the mercury dropped from 36 to now 30.3 and the snow is blowing hard (wind NW at 10 gusting to 15). In less than 5 mintues, the streets were covered with snow and it is continuing to come down! Hopefully the moisure stays around for awhile. I’m at 300′ elevation near Gaiser Middle School off NE 99th Street.

  11. now down to 29 with a NNW wind at 6-10

  12. Tyler in Hazel Dell says:

    No…where are the kudos? My first text mentioning snow for TODAY was last Wednesday.

    Several area mets called this trace-1″…

  13. wendy-silverlake,WA says:

    Temp 23.4
    DP: 21

    Dropping an average of 2-3 degrees an hour and still snowing.

  14. Over-running snow behind the low:

    Showing up on radar now north of Kelso. Don’t expect it to move any further tho as the low weakens.

  15. t - Battle Ground, 216ft. says:

    Hey, where’s Bob?


  16. W7ENK says:

    For you Silverton folks, a friend of mime that has a small farm along Kauffman Road just reported “Feathery floaty flakes falling… FINALLY!!”

  17. Joshua in Lake Oswego says:

    Snowing very lightly here and sticking too! It looks like maybe another 1/2 or so and then it is all done. Good enough for me.

  18. goducks09 says:

    Seems to appear that there could be wrap-around bands of moisture if the Low passes to our SW.

  19. Snow-Zone/Monmouth-Elv200' says:

    Amazed how much snow is falling. Radar shows practically nothing over me. An explanation?

  20. Danny in Troutdale says:

    Well I left to get gas at 7:45 and go to walmart to get food. There was no snow. I leave walmart and its snowing and 3 min later i get home and everything is white! that was at 8:10. all the stuff pon the roads has gone.

  21. Chuck on Mt Scott says:

    If anyone is interested in the Wash county and Clack County incident mapping, go to this site.

  22. Snow-Zone/Monmouth-Elv200' says:

    coming down at a pretty good clip again. 33.3F. I hope I get stuck under band of showers.

  23. kcteach-Gresham-500' says:

    Front porch is white. More like graupel though. Small bits of styrofoam. Still love it

  24. Looks like the arctic front has hit woodland now

  25. stevied (North Portland) says:

    Man, look at the 00z text output for Spokane and Portland. Seems a bit historic, those numbers (for this time of year, anyway). -20c in Spokane and -15c in PDX


    • Andrew Johnson says:

      -14 850 mb in Salem. To bad it looks like we get clouds tomorrow night and don’t get peak radiational cooling 😦

  26. J-Kelso says:

    27.8, breezy.

  27. stevied (North Portland) says:

    that low is looking a little better defined as it approaches Astoria now. Hmmmm.

    • t - Battle Ground, 216ft. says:

      It does look more defined. Would love to get some bonus coverage on the wrap around.

  28. brandy says:

    snowing here 1/2 inch on the ground! 787ft dallas

  29. W7ENK says:

    😆 Women can be so strange… even after seeing the flakes falling from the sky and onto the ground with their own eyes, these two will continue to say “It’s not going to snow.”

    Really?! I mean, REALLY?!?

    No offense to anyone on here, just an observation about the women in my life…

    Down to 34F, winds NNW Light.

  30. In regards to the surface low dropping down the coast

    1) As the low moves away from the Olympics it is weakening quickly and will fall apart.

    2) That cold-core dry pocket approaching PDX now will cause any wrap around action to be mainly orographic from here on out as NNE winds dry the air very quickly in the next 60 minutes.

  31. J-Kelso says:

    Passed Kelso around 8:40

  32. Boydo3 500' North Albany says:

    Outside on my deck facing the north, lite flurry and nearly full moon at the same time. I could almost get religion!

  33. David Mall205 says:

    Any updates on where the front line is now?

    • AdamInAumsville says:

      Based on radar, I would guess the arctic front is about halfway between Kelso and Portland.

  34. AdamInAumsville says:


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