5:15pm Sunday

The numbers are in…and as expected it was hotter today in the metro area with hot easterly wind holding off the cooling breezes until AFTER the 5pm high temperature.  Here are the numbers, which are unlikely to change in the next 2 hours:

Check out the 5pm temperature map…

Portland sticks out like a (hot) sore thumb as they say.  100 here, but 10 degrees cooler in Salem and 20 cooler in Kelso & Eugene.  The heat wave has ended all areas west of the Cascades except right in the immediate metro area.  Gusty southwest and northwest wind will be converging in the middle of the city in the next 2 hours as we are getting a major marine push…that’s cooler ocean air pouring inland.  This will end our heat wave by sunset.  So let’s look at the numbers:

In the middle/latter part of this past workweek we forecast 92-100-102, so we were within 2 degrees with each forecast.  See what I mean about forecasting heat waves compared to other “extreme” events west of the Cascades?  Models handle these sunny periods pretty well, at least here in the metro area.    They nailed the idea of easterly wind holding on in the western Gorge through the mid-late afternoon, allowing PDX to max out its high temperature around 100.

What about tomorrow?  It looks REFRESHING.  High temperatures under partly cloudy skies (just a slight chance for a sprinkle) around 78 degrees…very nice.

Chief Meteorologist Mark Nelsen



  1. W7ENK says:

    I can also corroborate this.

    At about 4:30 on Sunday afternoon, I stepped out front and immediately thought to myself: “Good Lord, this is probably about the hottest temperature I’ve ever felt outside here in this neighborhood!” I stepped back into my 65 degree air conditioned house to go check the reading on my weather station and was blown away to see 110.3°F

    Ordinarily, one might think my sensor was in direct sun, but it had been in the shade of my neighbors’ tall trees for about 2-1/2 hours at that point. Besides, it’s in a naturally aspirated housing to begin with, so it shouldn’t be getting a bad reading. Still though, thinking that had to be erroneous, I looked online at the official reporting station that’s only ~3,400′ away, straight line to my NW.

    It would seem that mine wasn’t all that far off, then. Roughly a 3 degree difference, certainly within the realm of possibility. At any rate, it was un-freakin’-believably hot on Sunday!

  2. JohnD says:

    Kind of old news now; but driving home at the peak temp hour from inner NE to inner SW, our Jetta car thermo read at one point 112′. Clearly it is prone to inflated max temps but I am pretty certain that it may have been at least 106′. Corroborating this, I see that the reading at Lake Oswego was 108′ yesterday, for example. Definitely a hot day all across the metro.

  3. Jason Hougak says:

    The CPC and 16 day GFS look pretty comfortable temperature wise.

  4. Jason Hougak says:

    What a difference 80 degrees feels after the weekend.

  5. WEATHERDAN says:

    Another warm and dry month just about done. Looking forward to another nice Summer this year. Last Winter was nice but am looking forward to a warmer and drier one. Peace.

  6. Anonymous says:

    I don’t recall RAIN being in today’s forecast?

    • Mark Nelsen says:

      Neither do I! The WRF-GFS model hinted at a few showers or a thunderstorm this morning, but I went with the other dry models. Duly noted for report card.

    • Paul D says:

      Don’t beat yourself up over it, Mark 🙂 Sometimes it’s fun to get a little surprise.

  7. Please watch in HD!

    A short video from today’s storm. Mostly thunder, a couple of bolts of lightning if you look closely, with the best bolt around 1:18.

    My 10th day with thunder this year.

  8. Anonymous says:

    Please watch in HD!

    A short video from today’s storm. Mostly thunder, a couple of bolts of lightning if you look closely, with the best bolt around 1:18.

    My 10th day with thunder this year.

  9. Jesse-SW Portland Suburbs says:

    This is the copy of a comment made by “wx_statman” on the Weather Forums, in regards to Mark’s comments about the record heat in Astoria yesterday. Some interesting stuff here. It would be good to see you address the data “scrubbing” issue at some point in a blog post. Mark! I don’t know if you are aware of it.

    Looks like Mark Nelsen is going with the newly scrubbed numbers for Astoria (I don’t know whether he realizes it or not). The record books at Astoria and numerous other stations have been destroyed by the QC’ing process that NCEI implemented last year to U.S. weather data. NCEI is the official repository for U.S. weather data, and places like the NCDC, WRCC, Threadex and the Utah Climate Center draw from NCEI’s database of daily observations for official U.S. weather stations. As far as I know, in an effort to scrub erroneous readings, NCEI simply applied blanket statistical correlation formulas to the weather data. This process knocked out many of the “outliers” which in fact represented legitimate extreme events.

    For AST, the all-time record high of 100 on 7/11/1961 was scrubbed from the record books along with many other extreme maximum readings from the past (96 on 8/9/1981, 95 on 8/13/2002, 93 on 5/16/2008, 93 on 6/8/1955, etc).

    So this has led Mark Nelsen to say:

    The 93 at Astoria was the 4th warmest temperature on record out there. The all-time high at Astoria Airport is 98, set just last August. The 1st, 2nd, & 4th highest temperatures ever observed at AST have been set in the past 15 years. I think a coastal heat wave blog post is in order at some point…”Is Heat Becoming A More Regular Visitor to the Oregon Coast?”


    As it turns out, nothing in that paragraph is accurate. It’s really unfortunate.

    • Registered Nerd says:

      I agree…I’d like to know whether these are legit temperatures that were scrubbed for what reason? How do they know if they were legitimate or not? Seems iffy. Let’s hear a post on this Mark! Inquiring minds want to know…

    • Jesse-East Vancouver says:

      Those records are legitimate. They were scrubbed erroneously.

    • muxpux (Longview) says:

      In layman terms, it’s like looking at the wundermap and seeing a home station at 109 and disregarding it, as opposed to trying to verify it.

      But being a computer program, it probably doesn’t take into account a places geographic location, and local microclimate variations that can cause extreme events. Like brookings hitting 80 in the winter, lol.

  10. Hal in Aims says:

    so the marine surge lasted about 15 minutes here……..the temp did drop about 10 degrees then stopped…….so did the wind……currently 84 outside…..and 85 inside…dead calm and very muggy….nice sky and the sound of fans running….

  11. Jason Hougak says:

    All I have to say was pulling a 420′ deep well pump today was miserable. I cannot wait for snow and cold!

  12. 87 here today, tomorrow’s forecast high is 70. Was hotter where I was camping (Olympic Mountains, further away from marine influence), low-mid 90s at least. I do not miss Portland’s triple-digit heat waves.

  13. Dave in SW PDX (235') says:

    102.5° for my high temp this afternoon, one of the highest I’ve ever recorded at my home station. A real scorcher. Good thing they moved the start time to 7:30 tonight – Go Timbers!

  14. Ann says:

    I don’t think I’ve ever noticed such a fast change. In the last 20 minutes, the weather station I’m watching online has dropped 5 degrees. (Thank goodness!)

  15. Paul D says:

    78 tomorrow?!? YIPPEE!

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