A Very Warm Night, Then A Record High Today

9:00pm Tuesday

Today sure felt like summer didn’t it?  The strong “offshore” easterly wind didn’t let up for many of us last night; some of us in the metro area and most coastal cities didn’t even get down to their typical high temp!

Mark Coast Warm Lows

Here in Portland we dropped to 53 degrees, not quite a record warm low, but close.  Then the easterly wind pushed temperatures above 80 degrees for most of Western Oregon and parts of Southwest Washington this afternoon.

Todays Observed Highs OrWa 2017

The 88 at Roseburg was the highest observed temperature in Oregon today.  Two cities set records for the day: Portland and Astoria.

Record Highs Cities

Obviously the “scorcher” is a bit tongue-in-cheek, but these temps are far above normal for the last week of April.

I expect 3 changes (minor) for Wednesday:

A) Wind turns onshore (southwesterly) along most of the coastline = MUCH cooler.  Likely 60 around Newport to low-mid 70s up at Astoria

B) Warmer atmosphere overhead everywhere east of the Coast Range.  850mb temps at Salem were +14C from the balloon this afternoon.  That’s exactly what models showed.  They all say +16 tomorrow afternoon.  That would give us about 3 degrees warming.

C) East wind backs off.  It’s already happened the past 6 hours, but pressure gradients east to west over the Cascades will be weaker tomorrow.  We still get offshore flow, but with far less mixing, afternoon temperatures should rise a few degrees.

Combining the last two I figure we get about 5 degrees of warming in the metro area tomorrow, specifically the areas that were a little “cool” due to the wind today.

Thursday is real interesting because the east wind comes back a bit stronger, then goes almost calm late in the day as a major marine push begins to push into the central/southern Willamette Valley.  Thursday may be one of those days where we make it to 85 in Portland, Salem is 78, and Eugene only hits 70.

We have a HUGE change coming up Thursday night and Friday as we get a “double whammy”.  A major marine push (solid marine layer 5,000’+ thick west of the Cascades) plus a band of rain moving north through Western Oregon.  It’s likely we stay in the 50s Friday.

So we’ll likely go from summer-like warmth in the 80s Thursday to 50s and wet/gray all day Friday.  Pretty drastic for our climate, but I’ve seen it happen before.  Plan to have all your dry weather projects done by Thursday evening!

Chief Meteorologist Mark Nelsen



17 Responses to A Very Warm Night, Then A Record High Today

  1. K says:

    What is the most impressive thunderstorm any of you guys have seen a video of or actually experienced? I have been browsing thunderstorm videos on Youtube, and found some of a thunderstorm in Helsinki, Finland. It looks terrifying!

    • W7ENK says:

      Central Minnesota, mid-August 1988. 9 severe thunderstorms in 22 hours, the first of which came just after sunset. The lightning was seamlessly continuous, and the thunder didn’t stop, varying in loudness for several hours. The last one happened right before supper, and dropped golf ball sized hail on us at the family farm, and in the next county to our South the hail was softball sized, and a huge tornado tore a swath several miles long right through the North end of St. Cloud.

      I’ve never seen so much lightning in one day in my life, not even in Florida!

      • K says:

        Wow, I would love to see a series of thunderstorms like that, property damage notwithstanding of course.

  2. K says:

    NWS not on the thunder train as of now.

  3. K says:

    Completely unrelated to weather or our area, but police have caught the Golden State Killer who terrorized California for years. Super interesting.

  4. Roland Derksen says:

    74F for a maximum here yesterday. That’s not a record for the date, as I had a higher reading back on April 24th, 1977 (76), but I think today we could set a new record. No night-time thunderstorms wanted here, thank you.

  5. JERAT416 says:

    Bring on some strays!

  6. W7ENK says:

    SPC is on board for thunderstorms tomorrow night.

    • K says:

      Marginal risk?

    • Ken in Wood Village says:

      I wish that darker green would go up North a little further…hehe. I was just looking at the models. The NAM & GFS still has a good chance of thunderstorms. It still looks like it will be nocturnal thunderstorms. Just wish it was closer to 10pm than 3am…lol.

    • W7ENK says:

      Hey, it’s better than a 0% chance, so that’s something…

      • K says:

        Alright. Hoping for a little excitement. We are also apparently receiving a deformation band, but I have no idea what that is, so someone please fill me in.

        • Ken in Wood Village says:

          I know what it means but I wanted to give you the most accurate information so I googled it…hehe.

          “A deformation zone is a region of significant stretching in the atmosphere. … In the winter these systems can produce showers and thunderstorms ahead of the cold front, widespread rain north of the warm front, and a band of heavy snow northwest of the low along and southeast of the deformation zone”

          I think this is very accurate. I’ve seen in the past were one thunderstorm starts and what that one does is it makes the atmosphere around the area very unstable then other thunderstorms blow up. I just hope they don’t train. That would be very bad with having a lot of rain in one area. 😦

        • W7ENK says:

          Maybe not 100% accurate, but this is a pretty good analogy that’s fairly close.

          Imagine a big beach towel, soaking wet, stretched out in the sky overhead, dripping down all the excess water the towel is unable to hold. Imagine that as an analog for just your regular old stratiform rain. Now, what happens when you deform that towel from it’s normal shape by twisting it up really tight? It covers over a much smaller area, but it wrings out a whole lot of that water in a very short amount of time. When this happens in the atmosphere, it usually creates a lot of instability — updrafts and whatnot — which can (but not always) produce lightning.

  7. Paul D says:

    Go away August! Wait your turn!

    • Ken in Wood Village says:

      I know what you mean. I was thinking of putting the A/C in the window but I know we still have cooler and wetter days ahead. I’m also dreading having to take the A/C out of storage and lugging it upstairs…hehe.

  8. K says:

    Weather whiplash! How exciting. Still hoping for some thunderstorms, but won’t hold my breath. Also, first!

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