Frosty Night, then May “Hot” Weather On the Way

Tonight should be a perfect setup for a very cold May night.  Clearing sky, wind goes calm after midnight all areas, and an unusually dry air mass.  These all give us a perfect cooling opportunity.  Protect any plants that are considered “warm weather veggies”.  That would be beans, tomatoes, eggplants, cucumbers etc…  I don’t expect it to be cold enough to damage blooming fruit trees.  Usually it needs to be below 30 for that to happen.

Tomorrow morning’s record low in Portland is 37 and we’ll be quite close…we’re forecasting 38-40 right here in the city.  But outlying areas will be a bit colder tomorrow morning than today.  Places like western Washington county and central/northern Clark county could drop to 30 or even a notch colder.

Then it’s on to lots of sunshine the next 6-7 days.  An upper-level ridge builds over the West Coast; it’ll be directly overhead Friday through Monday.  So most of that time we’ll either have a thermal trough (lower pressure) west of the Cascades or at least no onshore flow (Monday).  Combine that with a much warmer atmosphere overhead and it’s going to get real warm.  The GFS would imply we stay below 90 degrees Sunday and Monday, but the ECMWF was a scorcher, showing possible lower 90s both days.  It’s a bit too early to tell, but to be safe we raised both high temps to 88 on our current 7 Day forecast.  Might be a little hot for Mom, but a great afternoon/evening for barbecuing in the shade.

Chief Meteorologist Mark Nelsen

39 Responses to Frosty Night, then May “Hot” Weather On the Way

  1. Jbpdx says:

    Very annoying parade of pesky clouds keeping away the sun this afternoon. Definitely not sunny.

    • W7ENK says:

      Clouds? What clouds?? Where clouds???

      A quick scan of the sky, and I don’t see any clouds, anywhere…

      Is something on fire near your location??? o_O

    • shawnpippin says:

      Lol this JBpdx guy… He tries soooo hard to troll.

    • Jbpdx says:

      I don’t know where you were but this is what the NWS was reporting for Hillsboro when I posted:

      10 14:53 Vrbl 3 10.00 Mostly Cloudy BKN065 58 33 39% NA NA 30.35 1028.0

  2. WEATHERDAN says:

    Down to 32 degrees here in Salem this morning. Up to 56 at 1 PM. Looks like sunny and warm up until just before Memorial day weekend, then cooler with a little precip. Much better than last two years. I hope this is a prelude to our upcoming summer. But as always we will find out in November how it all came out. In the meantime I hope you all have a nice weekend.

  3. Garron near Washigton Square says:

    Got down to 33, currently almost 20 degrees warmer in less than 6 hours at 52.

  4. W7ENK says:

    Oh wow… just… WOW! 😯

    • pdxgeologist says:

      I wonder what that does to the fish…

    • boydo3 N Albany says:

      Is that for real?!

    • W7ENK says:

      What really gets me is the lunar eclipse and star field above, this whole thing makes an awesome composition!

      Lightning Eclipse from the Planet of the Goats
      : Chris Kotsiopoulos (GreekSky)

      Explanation: Thunderstorms almost spoiled this view of the spectacular June 15 total lunar eclipse. Instead, storm clouds parted for 10 minutes during the total eclipse phase and lightning bolts contributed to the dramatic sky. Captured with a 30 second exposure the scene also inspired what, in the 16 year history of Astronomy Picture of the Day, the editor considers may be the best title yet for a picture (title credit to Chris K.). Of course, the lightning reference clearly makes sense, and the shadow play of the dark lunar eclipse was widely viewed across planet Earth in Europe, Africa, Asia, and Australia. The picture itself, however, was shot from the Greek island of Ikaria at Pezi. That area is known as “the planet of the goats” because of the rough terrain and strange looking rocks.

      Or, then there’s this one…

    • runrain says:

      Instant fish and chips!

  5. JJ97222 says:

    Lets hope this is the last 30 something temp till the fall hopefully we can say hello to a toasty late spring & summer, its starting out great! This weekend is going to be a 10+!

  6. gidrons says:

    I didn’t check the temperature but had to scrape ice off the car this morning. Hope the pears, apples, cherries, peaches and plums survive.

  7. W7ENK says:

    Yep, glad I waited before planting my garden…

    33.1F this morning with light frost on roofs and grass.

  8. weathercrazy82 says:

    Low of 29.9 here…glad I covered the tomato. Things are white this morning.

  9. bgb41 says:

    5/9/2012 Oregon (All) Temperature Summary

    High:85 at Rome(4049 ft)
    Low: 52 at Rye Valley(I-84(2230 ft) & Wyeth(97 ft)

    High:36 at Timberline Lodge(6001 ft)
    Low: 19 at Timberline Lodge (7001 ft )

    Largest Diurnal Change: 41 degrees
    Lakeview, Lake C (75/34 ) (4734 ft )
    BALTZOR RANCH NE (75/34) (4620 ft)
    Rome (85/44) (4049 ft)

    Heaviest Rainfall:
    0.06″ at SIGNAL TREE(3294ft)
    0.06″ at TIDEWATER(2035ft)

  10. weathercrazy82 says:

    49 now, but peak wind of 23 mph in the last 15 minutes.

    I should mention my dewpoint is also 9 degrees cooler than last night.

  11. weathercrazy82 says:

    Windier this evening that it was last night! I just went and staked one of my trees that I planted last year. It had no issues all of last summer, but the leaves are out earlier and the wind was really making the little guy lean! Peak gust of 25 mph in the last 15 minutes.

    • Mr Data says:

      I was about to mention it but Mark beat me to the punch.
      Western Weather forums have been talking about brushes with a canadian airmass then a trip to the 90s followed by another polar air mass next week with this roller-coaster Tycoon pattern continuing for the foreseable future.

    • boydo3 N Albany says:


    • Mr Data says:

      I was making sort of a joke about our May weather being like a roller coaster so I decided to throw in that game but obviously nobody got it. ;(

      It’s a popular video game. On YouTube people have *modded the game to make very accurate Disneyland recreations however I do not know if the actual game play is any good in terms of freedom in what kinds of rides your allowed to build.

  12. weathercrazy82 says:

    I’m loving the high clouds streaming over today. Looks like a nice little jet streak directly overhead.

  13. philinforestgrove says:

    Best streak of amazing weekend spring weather I can remember here in Portland.

  14. John says:

    Hi all … was wondering if someone could clue me in on what the streaking clouds over Oregon & Washington (SW to NE direction) is in this visible satellite view?

    0Z image was the one I saw…

  15. Garron near Washington Square says:

    All I can say about this weather is F-A-N-T-A-S-T-I-C!!!!!!!!!!!!!!!!
    Best May since 2008! May it continue……

  16. karlbonner1982 says:

    So basically we go from 30 to 90 in just two or three days? Now THAT’S something to brag about!!!

  17. bgb41 says:

    My favorite high temperature is 86-92 degrees. I wish it was that high temperature 365 days a year.

    • Mark Nelsen says:

      Oh man, if Jesse sees you write that you’re a dead man. Clearly a warm bias. Quite similar to Panama City, Panama?

    • karlbonner1982 says:

      “If Jesse sees this” bwahaha!

    • Mr Data says:

      So you want us to have a Sacramento Climate where it’s between 95-100F for most of the season until early-sometimes late October?

    • bgb41 says:

      Funny you mention that Kyle. Sacramento is where I would like to live someday soon.

    • gidrons says:

      I agree Brian. Those temps are warm off enough that the girls don’t wear much but not so hot that it keeps them inside.

  18. muttville1 says:

    Good God Hallelujah!!

  19. pdxgeologist says:

    I’ve only got lettuce, arugula and peas in. Almost put the cucumbers in last weekend – glad I waited. Hops are already 15 feet high – don’t think they’ll be a problem though.

  20. W7ENK says:

    Glad I haven’t planted yet, that’s on the agenda for this weekend. 😕

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