The Chilly Wind Is Back

Snapshot A few tweaks to the forecast tonight.  First, it looks as if a nice cold pool IS developing east of the Cascades, more than I would have expected considering how little snow is on the ground in the Columbia Basin.  A surface high has strengthened in the Columbia Basin with just about 10 millibars easterly gradient from PDX-DLS.  The depth of the cold air east side is almost 3000' now…for example I noticed Middle Mountain (in the MIDDLE of the Hood River Valley), around 2400' is running 8 degrees colder tonight compared to last night.  Corbett at the west end of the Gorge, which is "well-mixed" due to the strong wind, is running 8 degrees colder compared to 24 hours ago as well.  So…I have a feeling high temps will be cooler in at least the eastern 1/2 of the metro area tomorrow.  I went 48 for PDX, but it may only be 44-46.  For sure it'll be windy and chilly east of I-205.  With no change in the upper-level pattern through Monday, I think we'll cool a few degrees through that time.  So forecasts of 50-55 degrees are sure not going to happen.  And for those of you in the windy areas, it's going to be a long period of annoying east wind.

With 10 millibars gradient, the dry air has sure been slow working it's way across the metro area.  Dewpoints in the 20s in Gresham/East Portland are a good sign that eventually we'll get rid of the fog though.  I think it'll be a non-story by midday tomorrow.

If you want warm weather, head up or west.  The Coast should be in the 60-65 degree range the next few days, and some spots in the Cascades made it into the lower 70s today!

Long range, not much to talk about…either ridging or split flow is the story through the end of next week…Mark Nelsen

110 Responses to The Chilly Wind Is Back

  1. Boring Larry in Cherryville el.918 says:

    …it’s really weird how when standing outside in a very light wind, all of a sudden it gets a bit stronger, and the temp momentarily feels….warm!!!!!!!…then it goes away again…repeat as necessary…..

  2. Atmospheric Wrath aka Gradient Keeper - Elevation 300' -Far S.E. Portland- says:

    Hmmmm well I don’t know for certain, but the mesowest maps I just looked at showed at least 4,000′ deep across north-central, northeastern Oregon, and Columbia Basin.

  3. Atmospheric Wrath aka Gradient Keeper - Elevation 300' -Far S.E. Portland- says:

    Hmmmm well I don’t know for certain, but the mesowest maps I just looked at showed at least 4,000′ deep across north-central, northeastern Oregon, and Columbia Basin.

  4. Silverton500 says:

    Throw in some LaNina (which is now confirmed?) and we should still be in good shape.

  5. Silverton500 says:

    Throw in some LaNina (which is now confirmed?) and we should still be in good shape.

  6. geo says:

    wonder how deep that cold air is on the east side?

  7. Silverton500 says:

    Yep Geo!
    LRC says Feb 02 (I know, it’s a rough guess, not locked).
    Accuwthr says Jan 27 (climate-casting?).
    Does the GFS say Jan 29?
    Yes – I know all this contains some wish-casting, but it’s fun to hazard a guess.

  8. Silverton500 says:

    Yep Geo!
    LRC says Feb 02 (I know, it’s a rough guess, not locked).
    Accuwthr says Jan 27 (climate-casting?).
    Does the GFS say Jan 29?
    Yes – I know all this contains some wish-casting, but it’s fun to hazard a guess.

  9. Atmospheric Wrath aka Gradient Keeper - Elevation 300' -Far S.E. Portland- says:

    [Surface gradients]
    As of 9 PM——–| +/- 1hr Change
    PDX-DLS: -10.0 mb| 0.3mb Increase
    TTD-DLS: -10.6 mb| 0.4mb Increase
    4km cross section model is looking very windy through Sunday night/Monday.

  10. Atmospheric Wrath aka Gradient Keeper - Elevation 300' -Far S.E. Portland- says:

    [Surface gradients]
    As of 9 PM——–| +/- 1hr Change
    PDX-DLS: -10.0 mb| 0.3mb Increase
    TTD-DLS: -10.6 mb| 0.4mb Increase
    4km cross section model is looking very windy through Sunday night/Monday.

  11. geo says:

    superbowl snow!

  12. Silverton500 says:

    How about January 29 for snow?

  13. Silverton500 says:

    Oh, and early February snow (1st – 5th).

  14. Silverton500 says:

    Oh, and early February snow (1st – 5th).

  15. Silverton500 says:

    Oh, and early February snow (1st – 5th).

  16. Silverton500 says:

    Nice ice fog going on right now. 28 degrees and “frosting” out there. Is that as close as we get to snow for the rest of January? I still trust LRC that we get February snow.

  17. Andrew Johnson (Silverton) says:

    The sun came out here yesterday afternoon for a few hours, but not today. Had a high of 36 after a low of 31. 33 now.

  18. “We can also celebrate the fact that Mark thought it would clear out Thursday, Then Friday,Then Saturday and we still haven’t seen the sun except yesterday for 10mins.”
    Guess it all depends on exactly where in the forecast area you are.
    At my house, the sun came out Thursday by noon and shone the rest of the day.
    And it was sunny from sunrise to sunset today (Friday).
    I suspect we will see much sun Saturday, as well.

  19. “We can also celebrate the fact that Mark thought it would clear out Thursday, Then Friday,Then Saturday and we still haven’t seen the sun except yesterday for 10mins.”
    Guess it all depends on exactly where in the forecast area you are.
    At my house, the sun came out Thursday by noon and shone the rest of the day.
    And it was sunny from sunrise to sunset today (Friday).
    I suspect we will see much sun Saturday, as well.

  20. HIO Phil (Punxsutawney) elevation 189' says:

    High of 50.9 today. Low of 23.3 Brrr..
    Maybe a slight E drift to the air here. Temp 33.2 DP 28.

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