A 100 Degree Day For Some, More Ahead

9:30pm Thursday…

What a scorcher today!  Even without east wind showing up much yet in the western Gorge (at least more than a light breeze) we saw high temperatures poke into the low 100s in parts of the northern Willamette Valley.

Here in Portland we officially made it to 99 at PDX, breaking the record of 96 set just last year on this date…


Check out the 100 Degree Club!


Even Astoria briefly got in on the act…a day early, with an 88 degree high.  That gives you an idea of what is possible tomorrow with a downslope easterly wind out there.  Forks, Washington made it to 96 as the easterlies arrived mid-afternoon.

Tonight rising pressure east of the Cascades means the east wind kicks in through the Gorge and maybe a little over the Cascades as well.  That means we will totally mix down the dry and hot air mass overhead.  I haven’t changed our forecast this evening since everything still appears on track for another record-breaking day tomorrow.  But there are a few minor tweaks…


  • Two more days of record-breaking hot weather ahead.
  • Areas AWAY from the Gorge will likely see another 1-3 degree rise in high temperatures.  That means high temps could be up around 104 degrees in a few spots like Hillsboro, Salem, or Battle Ground.
  • Areas that get the gusty east wind NEAR and IN the Gorge will actually be slightly cooler.  Troutdale likely stays below 100 degrees Friday.
  • The official high temperature forecast at PDX is problematic because too much wind could keep it below 100 again, or if the wind stays light enough it could be 104!  We went in the middle and have a 102 degree forecast.
  • Exact numbers don’t matter because it’s going to be baking hot tomorrow and the heat will begin earlier in the day.  Today it was 81 at noon in Portland. Tomorrow it’ll be 85-90 in those windy locations already at noon.


For the weather geeks out there, the 850mb temperature ended up just as forecast this afternoon over Salem.  It was 24.2 degrees.  The atmosphere overhead will be about the same tomorrow, but offshore flow really kicks in, thus the thoughts above in the highlights.

Looking further ahead, we DO get some quick cooling Sunday with a major marine push.  That should drop us a good 15 degrees, then another 5-10 degrees cooling Monday.  Much better!

That said, it appears there will be one more warmup the 2nd half of NEXT week.  This time temperatures will remain below 95 degrees, hopefully only up around 90.  No rain in sight!

Chief Meteorologist Mark Nelsen





7 Responses to A 100 Degree Day For Some, More Ahead

  1. geo says:

    84 out here in sw gresham and it’s only 9am. gusty east wind blowing.

  2. runrain says:

    Still no east winds at PDX, though the temp is running 9 degrees higher than yesterday. That would translate to 108 deg for a high, an all time record for PDX. Not going to happen, but still fun to ponder.

  3. I definetly notice that dry warm outflow breeze this morning: 69F currently. This should usually be our coolest time of the day, but it was 64F at 4:40 am, which tells me the wind started blowing after that.

  4. runrain says:

    Cascade Locks at 4:00 am: 71 deg. At 4:30 am: 83 deg!!

  5. Tyler Mode in Battle Ground says:

    82 degrees right now on Larch Mountain…


  6. Actually next week’s hot spell looks a lot hotter than 90, according to the 00z GFS. 850mb temps back up near +25c over The Dalles, and almost as hot over Portland. And probably a little bit of east wind at the beginning to heat things up.

  7. Garron 1/3 of a mile from Hillsboro Airport says:

    A late summer benchmark for the record books to be sure. This will be a tool for measuring summer scorchers for a long time to come! Thanks Mark.

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