Cool Nights Return

A chilly night ahead tonight!  At 10pm the entire metro area (except right in the city) is in the 40s, some of the outlying areas already down in the lower 40s.  We’ll definitely have more 30s in the morning and in more places that haven’t seen 30s yet.  At my home I haven’t been below 42 yet this season and I’m already down to 42 right now.  There are some scattered high clouds moving through from a warm front well to our northwest, but there isn’t much else to inhibit the strong radiational cooling.  

Some spotty fog is definitely likely in the low spots overnight.  Offshore flow is gradually developing, but gradient is just now beginning to turn to easterly, so that won’t help too much.  We get some easterly wind through the Columbia River Gorge and out into the Metro area tomorrow, so it’ll be warmer and dry once the fog gets mixed out.  Then it’s on to our strongest east wind of the season so far on Wednesday morning.  Somewhere around 5-6 millibars easterly gradient through the Gorge.  That should give us gusts in the 30-35 mph range east metro and 40-45 mph in the western Gorge.  Thursday the offshore flow dies down as a very weak front approaches. 

We get some clouds and maybe a few showers late Thursday night or Friday morning, otherwise I don’t see a good chance for rain in the next 7 days.  Definitely no imminent start to the rainy season (many consecutive days of rain).  Actually it looks real boring the next 7-10 days.  Enjoy the sunshine!

By the way, tomorrow is the 48 year anniversary of the Columbus Day Storm…Wolf Read’s site is the best at taking an “exhaustive” look at the storm:

Chief Meteorologist Mark Nelsen

106 Responses to Cool Nights Return

  1. Ryan (Walnut Grove) says:

    12Z = Fire hose in the extended run… Possible shift in overall regime on the horizon? Me thinks so.

  2. Jesse-Orchards says:

    Amazing the difference a week can make this time of year WRT how high temps will peak out during a warm event.

    A week ago today PDX hit 80 with offshore flow and a similar 850 temp profile to what we’re seeing now. Today, almost ten degrees cooler, at 71. The long nights/lowering sun angle/cooling landmass really starts to catch up with us around this time. It takes a truly extreme event to get PDX to 80 at this point. Eight days from now 80 will become climatologically “impossible” there until mid-March.

    73/36 here today

    • Rob "Wrath" S.E. Portland says:


    • Mark Nelsen says:

      I sure noticed that. Those record highs are probably more a mix of offshore flow and/or southerly wind ahead of an approaching cold front?

      One other thing…today is the first time I see Redmond and Bend were warmer than The Dalles. Temps were warmer at the higher elevations over there. The inversion season is just about here.

  3. Yevpolo1990 says:
    Look at the wind speeds in the gorge! ranging from 30-35 mph sustained.

  4. W7ENK says:

    So, I’ve been waiting for these East winds all day… I pushed all the (few) fallen leaves in my yard to the Western edge of my property so they’ll all blow into my neighbor’s yard, but they’re all still sitting there, and my neighbors will be home in less than an hour. 😆 j/k

    Seriously though, it’s been calm all day, but it’s warm. All in all, it’s been a BEAUTIFUL day! Dare I call it perfect? 🙂

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