A Historic Hot Day Across Eastern Oregon & Oregon

11pm Sunday…

The heatwave west of the Cascades ended up pretty reasonable, except for the sweaty overnight lows of course.  Here in Portland we just had 3 days at/above 90 degrees.


Of course we were “robbed” of the 100 degree day Saturday by the thick cloud cover, only hitting 92 degrees instead.  That’s okay, except for the weather geeks I’m pretty sure no one else was complaining.

But east of the Cascades the heat has been extreme, even by midsummer standards.  Pendleton the past three days has been 104, 109, & 109 again today!  Here are some other numbers today:


Walla-Walla at 113 was only 1 degree off their all-time high!  Meacham’s 101 is the hottest day in at least the past 15 years.  Many locations recorded their June all-time record of course.

The extreme heat has been caused by an unusually strong upper-level high pressure area that’s been centered just west of the Great Salt Lake.  Keep in mind that a week ago models were putting that high directly over us with easterly wind and a hotter atmosphere.  If that would have occurred, west of the Cascades we would be having all-time June high temps in the 103-107 degree range!  So we dodged the bullet this time around.

We didn’t dodge the warm nights with the cloud cover though.  Portland only dropped to 71 Saturday morning which was the warmest June morning on record.  This morning it was 70, although at 11pm we’ve dropped to 71 already, so even though we set a record, it remains to be seen if we ended up with back to back 70+ lows.  If we do, that’ll be the first time since the heat wave of 2009.  High and low temperatures are calculated based on a calendar day; so if you drop to 70 at 6am, but that evening at 11:50pm west wind comes in and it cools off to 69, then that 69 is the low for the day, not the morning low.  Got it?

The big ridge is being “dented” by a weak low moving around the western periphery of it tonight, thus the cooler temps today, tomorrow, & Tuesday.  But the ridge pops back up again Wednesday-Friday…POSSIBLY through the weekend.  As a result hot weather returns.  At this point we don’t see higher pressure at the surface east of the Cascades to give us a scorching hot east wind.  So it’s unlikely we get up around 100 again unless that pattern develops.  Regardless, a bunch of days 90+ are on the table as heat wave #2 arrives.

Chief Meteorologist Mark Nelsen

33 Responses to A Historic Hot Day Across Eastern Oregon & Oregon

  1. Eugene Dave says:

    Warmest June ever for Portland, Salem, and Eugene. In Eugene, the avg high was 83.5, which is an incredible 11.3 degrees above normal. Yikes!


  2. WEATHERDAN says:

    92 at 3:00 PM. North winds gusting to almost 25 MPH. Really pleasant afternoon out today. Terrible news about old baseball stadium in Eugene burning. Same thing happened to stadium in Salem in November of 1966. That’s why they don’t build wood stadiums anymore. Stay cool. Peace.

    • High Desert Mat says:

      I’m ready for fall and football already. This heat in central Oregon has been brutal. Thankfully I have ac but going around town sucks. Car is hot, seats burn me, and the sun is blistering. I’d say 120-130 out in the direct sun lately. Which reminds me, I just had surgery to remove melanoma on my back and two lymph nodes removed, so I will be out of the sun from now on regardless. But the good news is when they did the biopsy on the nodes they came back negative so thank god it didn’t spread.
      Come on troughiness!!!!!

    • Paul D says:

      This is starting to remind me of when I lived in Phoenix, and I don’t miss it a bit. We need cooler weather ASAP, and unfortunately it ain’t in the 7 day forecast.

  3. WEATHERDAN says:

    87 at 1:00 PM. AM low was 59. On pace to reach 95. Should be close to 100 Wednesday and Thursday. Hot weather to continue for some time to come. should cool down to around 90 next week. As long as this ridge stays in place we will not see any significant cooling. And the ridge is forecasted to remain pretty stationary through July. No surprise, it has been there most of the time since the Spring of 2014. Peace.

  4. Lee Wilson says:

    We had misty conditions this morning. Interesting 6th should.menti warm nights.

    The Cowlitz River must make a difference because we been having cool nights if it were still in the 80’s I would have pitched a tent in the front yard and have a practice camp out.

    But such that it was, we didn’t have the warm nights.

  5. David B. says:

    A nice marine push overnight; it’s been overcast since daybreak.

    Nice for those of us on the West side, that is. It’s just going to cause headaches for those fighting the fire near Wenatchee; the cooler air West of the mountains in conjunction with the still-hot air east of them should really whoop up the gap winds through the passes today.

  6. schmit44 says:

    6/29/2015 Oregon (All) Temperature Summary

    High:107 at Weatherby Rest A(2390 ft) & ALKALI FLAT(2495 ft)
    Low: 84 at JUNIPR(359 ft)

    High:58 at YACHTS Yachats(82 ft)
    Low: 43 at Sand Creek (US 9 (4525 ft ) & KIRK (4519 ft )

    Largest Diurnal Change: 48 degrees
    KLAMATH BASIN NW (95/47 ) (4200 ft )

    Heaviest Rainfall:
    0.30″ at HOOD RIVER(510ft)
    0.28″ at DW3693 Hood Rive(699ft)
    0.27″ at EW7038 Hood Rive(570ft)
    0.22″ at PINEGROVE(620ft)

  7. schmit44 says:

    Lewiston, Idaho low temperature was 85 this morning

  8. Boring Oregon says:

    Mark, do you still grade yourself based on forecast prediction? And if so, what’d you get last week?

  9. Jason Hougak says:

    Mark what was the big missing ingredient to trigger thunderstorm development? Seemed like several times it was prime and then poof and it was gone. Was the atmosphere too stable? We need a big push of monsoonal moisture to give this tinder matchbox some relief and some weather action. Summer weather in the PNW is boring. Some are so happy just to state their high temps for the day… yawn. Gonna be a record for dry wells too.

  10. David B. says:

    86 for a high today. Warmer than Seattle, which is unusual.

  11. Steven says:

    What exactly trigger a thunderstorm here? Even if all the other ingredients are in place (moisture, heat, instability), what would it take to trigger a storm? Basically, why were thunderstorms not widespread over the weekend?

  12. Nothing happened overnight in my area- I thought I saw a major band of moisture heading closer, but it didn’t reach us. There was some wind though, strong enough for some power outages in Greater Vancouver.(BC). Well, now it’s on the next round of heat.

  13. WEATHERDAN says:

    81 at 1:00 PM. Should hit around 90 this afternoon. Start of a new heatwave. 100 on Friday first time over 100 in June since 2006. Might be 100 again on Thursday. Few Altocumulus Castellanus off to the West and South earlier but mostly sunny in Sle. No cool weather in sight over the next two weeks. Highs should range from upper 80,s to around 100. Lows remain from upper 50,s to mid 60,s. Tremendous fire danger out there. I have never seen it this dry so early. Peace.

  14. Boring Oregon says:

    There was a great light show to the east of us last night if you were up for it.

  15. W7ENK says:

    What a muggy weekend!! Other than the ridiculous humidity though, it was fantastic.

    I knew on Friday afternoon, once I saw how much high cloud cover was moving in overhead that Saturday’s high temperature was going to bust by roughly 10 degrees. I have no idea why all the professional mets kept with their 100+ forecasts, even up until the Noon hour on Saturday… what were you guys thinking?!?

    Thunderstorms were a major bust, though with how hot and dry things are right now, I don’t mind so much. This doesn’t come as much of a surprise, I think we’re all used to it by now, but it’s still disappointing…

    Looking forward to the upcoming 3-day weekend, going to spend it with family at the beach house in West Oly. Probably our last opportunity for that, unless of course I win the lottery or can fundraise about $800,000 before the end of this summer. :-/

    • Boydo3 N. Albany says:

      Crowdsource it! Oh, but then you’d have to share it with the crowd..

    • Mark Nelsen says:

      The Saturday forecast was a bust, but no models were showing (neither did I forecast) any sort of good thunderstorm event. No good trigger.

    • Paul D says:

      When such a big deviation like this past Saturday happens, is it normal to not revise the forecast for that day? Why not update the 7-day graphic part way through the day?

  16. pappoose in scappoose says:

    Got it!

  17. David B. says:

    Thunder and more sprinkles overnight for me.

  18. jimbo says:


    • Paul D says:

      The clouds have been a very welcome relief! Hopefully more roll in this coming week and put a stop to the 90+ temperatures! It’s time for a normal summer!

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