May Heat For Mother’s Day

9pm Sunday

What a scorcher for Mother’s Day!  We not only saw our warmest day of the year so far but our first real “hot day” in the metro area.  PDX hit 90, the first of the season:

Mark PDX Record High Hot

Note it wasn’t a record, most of those are into the 90s this time of year.  As of today, this is the 4th warmest May “so far”…the first 13 days of the month.  I suppose saying it’s the 4th warmest start to May makes a bit more sense.  Tomorrow will be our 2nd hot day since we’ll have weak offshore flow in the morning (except in the south Willamette Valley) changing to an onshore surge of marine air by evening.  In between we should end up somewhere between 87-90 once again.

It’s also amazing how the “faucet” has shut off for almost a month now.  We’ve only seen 0.25″ in Portland in the past 4 weeks!  The last real rainfall here was one month ago…around the 15th/16th of April.  So it’s time to begin watering…much earlier than normal since I don’t see a typical cool/wet pattern setting up over us in the next 7-10 days.  That said, the ECMWF implies we may see widespread showers at some point NEXT week.  You see the green bars start adding up around the 21st or so.


I did see something interesting while on vacation…Hawaiian version of the “weather rock”.  This time it’s a coconut…


By the way, VOG (volcanic+fog) is the haze, not real fog, produced by Kilauea volcano on the Big Island of Hawaii and sometimes farther west into the other islands.  It looks/feels similar to our forest fire smoke days, but there’s no smell.  No, I didn’t see any real lava.  I stayed on the west side of the island, a good 2-2.5 hours away from Madame Pele’s fireworks.  I didn’t see any reason to drive that far just to sit at a roadblock and see steam in the distance.  I missed the big quakes too, didn’t feel a thing.

I have to say, it sure is nice to be home.  An 80 degree day blue-sky day in May in the Pacific Northwest beats any tropical location!

Chief Meteorologist Mark Nelsen


30 Responses to May Heat For Mother’s Day

  1. Roland Derksen says:

    Noticeable cool down here today with a high of 76F after an 87F yesterday. Tomorrow under forecasted clouds, it may struggle to reach 70F.

  2. Andy says:

    Thunderstorm activity really picking up in southern Oregon. maybe something will swing over the cascades north later.

  3. W7ENK says:

    It’s a finicky thing around here, thunderstorms. We have to have all the ingredients come together just right in order to get them to fire off — not just some of them, but ALL of them. Elevated CAPE values mean absolutely nothing if LI remains positive, especially if the cap never breaks. I specifically remember an instance back in July or August 2012 (or so) where Portland metro had CAPE values up around 3,500 J/kg overhead, but LI was still positive and the cap didn’t break, which is what I suspect happened last night.

    All too often, this is what kills our chances of getting thunderstorms in the Valley. It’s always such a waste of good potential!

  4. Lee Wilson says:

    The Hawaiian Volcanoes are made of 5 shield type volcanoes.
    And they been known to have :Slides: and some of them are whoppers for creating “Mega Tsunami”. safe to say, if Hilina Slump plunges in to the sea, there may be no residence on any of those islands, or if so a major decline in said population.

    I would not wish that night mare on any person.
    Not to mention of our coasts.

  5. Lee Wilson says:

    I don’t about you all, but we sure been making a killing on solar power production.

    But, i welcome this morning’s cooler weather…

  6. Lee Wilson says:

    You forgot one, coconut smoming, Lava..

  7. Paul D says:

    Last three days above 80 in Hillsboro. I declare it a May heat wave 🙂

  8. Troy Haliwell says:

    Well, while my weather station indicates “change to rain” I also note that humidity here in East Vancouver is a little on the high side at 60%. That made our 89F temp a heat index of 97F.

    Certainly felt that way running water lines and installing sprinklers for my lawn. I was sweating through my t-shirt most of the day, and drank at least a gallon of unsweetened iced tea.

    Made me grateful for a heat pump conditioned house which was 70F. Sure not as ecological as is called for, but damn it was needed today.

  9. K says:

    Maybe some t/storms?
    You never know!

    • K says:

      nvm, CAPE values now close to zero lol. Back to boring weather….

    • Ken in Wood Village says:

      Yea, not really seeing anything good for thunderstorms. It’s not the best setup for thunderstorms right now. ;( It’s only May so we have a few more months to get some good chances for thunderstorms 😉

  10. JohnD says:

    Didn’t get anywhere close to 90′ yesterday (or today) here in inner SWPDX @ 210′ . But unlike in winter when I typically curse the NWS stats–I’m glad that we had our “official” first 90′ at PDX! WooHoo!

  11. Tanis Leach says:

    It hit 91 today at my house in Sherwood at about 4 pm. Don’t know how that compares to other metro area sites though.

  12. W7ENK says:

    Outside chance of a rogue thunderstorm overnight tonight and tomorrow, another lesser chance tomorrow night and into Wednesday.

  13. alohabb says:

    Sitting here in Oahu and the VOG hasn’t really creaped in except for one VOGGY day. It is interesting to note that the lava being seen all over the news is lava from the 1950’s eruption and not the lava lake that has now disappeared. We haven’t even begun to see what madame pele has in store for the island.

  14. W7ENK says:

    Gorgeous weekend! Finally finished up my garden, perhaps a bit late, but it should be fine.

  15. boydo3 says:

    Westerlies have already kicked in here. So tomorrow should be a very nice, comfortable day thank you very much!

  16. Ken in Wood Village says:

    First 🙂

    • K says:

      Second, then. Tomorrow may just be hotter than today.

      • K says:

        Also Ken, I didn’t respond to your previous comment, apologies. I haven’t commented in a couple days because League of Legends (lol) has taken up a large amount of my spare time. But in terms of interesting weather, two weeks from today on the last run the GFS showed a 954 MB low careening towards New York. Will it happen? Nah. Is it interesting? Absolutely!

        • Ken in Wood Village says:

          LOL, it’s ok. I play Hearthstone and Star Trek Online…lol. I didn’t know about the 954mb low heading to New York, very interesting. Have you looked at the EURO CAPE? There is over 1000 j/kg close to the Portland area for tonight but no forecast for thunderstorms tonight…hmmm. 😉

        • Ken in Wood Village says:

          If you look on, if you look south of Africa, at the end of the EURO (Wed. 23th) it shows a low that’s down to 945mb….lol.

        • K says:

          Surprise thunderstorms? Hopefully?

        • Ken in Wood Village says:

          I don’t know, it just surprises me the CAPE is so high in our area. If it happens then we have a gift but if it doesn’t, oh well….lol

        • says:

          NWS just mentioned it.

        • Lee Wilson says:

          I play SkyForge …it has its moments. But dang, they need to stop pushing Veigns Invasion on every task…

      • K says:

        NWS has now mentioned thunderstorms. Crossing my fingers- can you keep me updated?

        • Ken in Wood Village says:

          I’ll keep a watch full eye out. I’m guessing the thunderstorms (if there are any) will be probably on the eastside of Portland. Which is good for me since I’m on the eastside. But I will tell you, I really don’t see anything happening tonight but I’m still hopeful.

          I did look at the severe weather outlook, tonight doesn’t look good but tomorrow looks better. We’ll see 🙂

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