Slow Weather

All Lightning Strikes Remained in the Cascades Again Today
All Lightning Strikes Remained in the Cascades Again Today

Another relatively slow day in the weather center; especially considering that there was plenty of convection around the region.  The problem was that it was all over and east of the Cascades…even with easterly flow.  All storms died as they headed west of the Cascade crest and ran into the cool marine air in place over us.

We are in a very messy forecasting pattern through the weekend.  An elongated upper-trough is basically straddling Oregon, giving easterly flow in the upper atmosphere overhead and westerly flow across the lower half of the state.  Low level onshore flow continues in Oregon with very light flow up in Washington.  I see western Washington has now had two days of very warm temps, Seattle tied a record high of 76 degrees.  Of course one wonders how the record is only 76 degrees, but it is a cooler climate up there in summertime.
I don’t see any significant changes through Saturday although maybe we’ll have a more organized area of showers move through late Friday or Saturday.  Models seem to be hinting at that.  As of now though I have no great appreciation for the intricacies of mesoscale modeling of our current situation.
Mark Nelsen

76 Responses to Slow Weather

  1. Timmy_Supercell (Hillsboro) says:

    Just woke up to heavy rain about 10 minutes ago. A very tiny yet intense cell above me. I wonder if anyone at the coast is hearing thunder

  2. Rob "Wrath" S.E. Portland says:

    And now it pulsed down a bit……

  3. Rob "Wrath" S.E. Portland says:

    Small, compact, yet intense cell continues to pulse up west of Gaston.

    Zoomed radar

  4. Rob "Wrath" S.E. Portland says:

    Well maybe my forecast of possible elevated convection if holding true…. New storm popped west of Forest Grove/Gaston and another NW of Warm Springs….

  5. just heard some thunder in the Grove – WN-37 spotter

  6. Rob "Wrath" S.E. Portland says:

    Ohhhh so that’s why you vanished in Flab5chat lol Okay.

  7. Rob "Wrath" S.E. Portland says:


    SPC Thermodynamic Fields show there is a reasonable amount of MU CAPE 1000-1200 over PDX/VUO metro areas with LI of 0 to -2… With a now moist air mass thanks to easterly flow aloft there could perhaps be some elevated convection over the next few hours especially near the Foothills and eastward.

    It’s just something I am keeping an eye on.

  8. well…crudola, i think my webhost has server issues, i’ll send an email, Rob….

  9. …it’s kinda pouring here right now..

  10. Hey Rob, lets try this again…can you meet me at the f5 room?

  11. Rob, i’ve been watching that gs-2, and it’s very plain…several have looked like they are bearing down on me, only to fizzle about 20 miles shy…..still raining lightly, but steadily right now….

  12. Keri from Beavercreek says:

    Were having a Bday Party for my daughter tomorrow at 11am. Are we gonna be able to have our treasure hunt outdoors????? Raining here in Beavercreek

  13. Rob "Wrath" S.E. Portland says:

    By the way, did anyone notice how the storms kept firing over the southern Washington and Oregon Cascades then moved westward only reaching the Foothills of Marion, Linn, and Lane Counties but never really into the I-5 corridor?

    No development near the counties along the western Gorge and no storms making it into the foothills of Multnomah or Clackamas Counties until about 1-2 hour ago. Has to be due to lower terrain near the Gorge and the persistent onshore flow into the PDX/VUO metro areas and west winds up the Columbia River which kept things stable.

    Any thoughts?

  14. Rob "Wrath" S.E. Portland says:

    We have some instability out there, but the main thing I’m noticing is a total cease of any onshore breezes and humidity has really jumped up…. Storms are scattered from Brightwood SE to Warm Springs. There was even a t-storm over the Coast Range in west/central Yamhill County… I do like the rising dewpoints with temps around 69-73F still….. Perhaps tomorrow conditions remain favorable….

  15. Lightning detector just went off…

    72.5F Td 60.8 RH 67%

  16. Aleta-West Gresham says:

    Sooo looked at my garden today, saw it was a bit droopy so watered it thinking no rain. Guess that was just a guarantee that it would rain. Just started here, nice big drops.

  17. ….been raining a bit here…..

  18. Gotten quiet since then. The cell is moving to the NW, which will have it pass to the north of me.

  19. stevied (North Portland) says:

    Thunderhead building just to the east of Sandy

  20. Cap - Hood River says:

    Getting lots of rumbles here in HR.

  21. Rumbles of thunder to my east for the past 10 minutes, and a cloud climbing quickly. Put in somewhere between Sunset Falls and Moulton Falls, mostly East and a little north of BG.

  22. podunk says:

    Seeing a touch of purple (65 dBZ) in that storm lying on the Mult/Hood River Co. line.

  23. podunk says:

    More westward development. Storms now in E. Mult. Co./E. Clackamas Co.

  24. podunk says:

    More westward development now as storms seem be developing at the eastern fringes of Clark and Mult.Cos. Still a long shot for storms but I wouldn’t mind seeing some lightning off to the east this evening.

  25. Rob "Wrath" S.E. Portland says:

    This cell sure pulsed up quickly!
    69.5dbz core

    Northeast of Cougar
    Possible quarter sized hail

  26. Rob "Wrath" S.E. Portland says:

    Nice storms popping over the south Washington Cascades

    Zoomed radar

    SPC thermodynamic fields show some marginal instability now. PDX/VUO metro areas are capped though. Perhaps some t-storms get into the Foothills though later.

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