Record Rain In Portland Saturday Evening

11pm Saturday…

Just a quick post to let you know we set a rain record in Portland today.  Between 4:30-6:00pm a line of heavy showers formed right over a line from Sauvie Island down to Parkrose.  Portland Airport, the official observation location for Portland, happened to be right under the downpour.  And it REALLY rained hard!  0.67″ in one hour from 5pm-6pm.  Just by chance, that number also happens to be the 30-year average August monthly rainfall.  So yes, we saw our typical August rainfall in just one hour…at PDX

Rain Record PDX_AC

Now that was at PDX.  At the same time, little to no rain fell just a couple miles south in Alameda and the Lloyd District!

Rain Metro Plot MANUAL

That’s how heavy summer “convective” showers operate.  Little areas of big downpours milling about, dumping big loads of rain on some neighborhoods but leaving others dry.  There were two Portland HYDRA sites (Portland Bureau of Environmental Services) that recorded over 1.50″ of rain at the same time.  You see the Portland Airport Post Office location recorded over 2″ of rain.  I’m a little skeptical of that one only because we didn’t hear of any flooding issues at the airport itself.  When we had 1″ rain in one hour about 10 years ago I remember there was water all over the place around the terminal.  Regardless, the graphic above shows the wide variety of totals, sometimes even just a couple miles apart (Newberg).

Showers are FINALLY dying down this evening and Sunday should be dry…unless we somehow get a morning sprinkle out of the low clouds.

By the way, today is one of three times we’ve hit our all-time high in Portland.  107 on this date in 1981.  But no heat waves in sight the next 7+ days.

Mark PDX Record Hottest Days Ever 100

Enjoy your Sunday!

Chief Meteorologist Mark Nelsen

12 Responses to Record Rain In Portland Saturday Evening

  1. W7ENK says:

    Friday night we had a couple faint flashes in the clouds followed by a couple distant rumbles around 10-10:30. Mostly just some light rain, not even enough to push us inside from the firepit. We sat out under the trees and listened to it rain until almost 2am. Only amounted to 0.06″, 0.05″ of which fell before midnight.

    Saturday was dry all day, except for the 0.01″ that fell before the rain ended a little after midnight. We completely missed out on those torrential downpours all afternoon and through the evening. We watched on radar as big heavy showers were skirting around us, in some cases literally only a handful of blocks away. One big cell missed us in the yellow/red by just a handful of blocks, all the while it was completely dry while I worked out in the yard. Radar showed green overhead, but it was dry as a bone. Didn’t hear any thunder.

    Quite obnoxious.

    Saturday night it began raining lightly right after midnight. It was so relaxing to fall asleep to the sound of the rain out my window. Woke up to 0.15″ in the gauge by morning. Despite thickening dark clouds all afternoon, didn’t get a single drop of rain all day long.

    Weekend rainfall total at my place in Milwaukie
    (6pm Friday to 6am Monday): 0.21″

  2. Tanis Leach says:

    A little off topic but the headline is so outrageous I have to post it.

    https://nypost.com/2019/08/12/us-could-be-hit-with-9-major-hurricanes-this-year-experts-say/amp/

    9 major hurricanes? The record landfalling is 3 and the record hurricane record is 7 in the entire Atlantic basin.

  3. Joshua Lake Oswego says:

    Believe it or not, August is running more than 2 degrees above normal so far. All low temps have been above 60. It’s hard to imagine even a single below average summer month these days.

  4. Jason Hougak says:

    The thunderstorms Friday night were spectacular and were grateful they brought much needed heavy rain. This summer has been perfect.

  5. Roland Derksen says:

    Just some drizzle here this afternoon. We’re still below normal for the month.

  6. Mike says:

    Are we now past the time, or late enough in summer that a heat wave is less likely to happen ?

    • JERAT416 says:

      It’s definitely still possible! By the time we get into late August though, it takes a stronger east wind though. Once we get into September though, heat waves are hard to maintain with longer nights.

    • oldwxwatcher says:

      Less likely, but it can happen. September 2, 1988 had an official high of 104° in Portland. I’ll never forget it – spent a few hours crawling under the dashboard of a sports car putting in a radio for a friend while the car was parked in a driveway. Hot, indeed.

    • PAUL D says:

      Are we going make it through summer without an “official” (per Mark’s definition) heat wave?!?

  7. JERAT416 says:

    Tigard got jack squat too.

  8. 0.84″ here in east Vancouver

  9. PAUL D says:

    Hillsboro got left out again. What a bummer!

    No heat waves in sight – music to my ears!

    (first!)

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