A Wet September, And More Rain On The Way

11:30pm Sunday…

A busy day with 5 shows this evening, but I’ve been watching lightning offshore from our Seaside and Lincoln City cams.  That’s been fun.

What a soaker today with around one inch of rain in parts of the metro area as a slow moving system moved overhead.  It was one of Portland’s wettest days this year.

In the first half of the month we’ve picked up our typical September rain AND it’s been the wettest first half of September in 23 years!

Rain Record PDX

There were quite a few spots that picked up more than 1″ of rain.

Rain Metro Today Databound.png

Cool and unstable air is moving over the very “warm” ocean water offshore this evening.  Did you know it’s 65-66 degree water just offshore?  That’s much warmer than normal.  These temps in Celsius of course.


The “Blob” covers a huge part of the Eastern Pacific this fall.  Just above all areas are running much warmer than average.  But that’s a story for another day…


So if you live at the coastline, expect thunderstorms at times tonight, but they should die as they move inland.  Then from midday tomorrow through afternoon, the inland heating with sunbreaks should give us thunderstorms with the associated downpours and possibly hail.  That will be for anywhere west of the Cascades including the Portland Metro Area.

Lots more rain to come with an organized frontal system Tuesday.  More on that tomorrow as we plow through a wet September.

Summer seems a long way back now…

Chief Meteorologist Mark Nelsen

13 Responses to A Wet September, And More Rain On The Way

  1. W7ENK says:

    The clouds yesterday afternoon/evening were quite impressive to watch. Huge, towering CU and Cb, really dark and angry bases, very slow and lumbering movement, circulation of about 100 miles in diameter centered directly over the N. Willamette Valley.

    Closed out the day just shy of a half an inch of rain at my place.

  2. Roland Derksen says:

    Quite an intense shower here late last evening, but today’s clearing skies are welcome. I’ve seen about 2.5 inches for the month so far- that’s about normal for a whole September.

    • Roland Derksen says:

      I have to update/correct my rainfall total. Including this morning’s rainfall, I have a month total so far of 3.01 inches.

  3. Jason Hougak says:

    Love this weather excitement.

  4. W7ENK says:

    0.57″ of rain today, all of which fell between 4 and 7pm. Two claps of thunder, one CG detected at 7 miles, the other didn’t detect, so it must have been CC.

    Currently skies have cleared, though everything is still so wet it’s all dripping. 54 degrees with 99% humidity. If it stays clear, it’ll be foggy AF in the morning. However, expecting clouds to move in and rain to start falling before sunrise, which should drown out any fog that forms overnight.

  5. W7ENK says:

    Thunder in Milwaukie!


  6. Andy says:

    -This years Blob I heard affects the surface water. Colder water is just under it. Once the fall storms kick in it will slowly disappear as it did a few years ago. We are definitely in a different pattern this year.
    Cross are fingers for an active Fall and Winter season.

    • W7ENK says:

      The storms in Fall 2014/Winter 2015 didn’t do much to churn the abnormally warm SSTs. Remember that one? I don’t think much will happen to the “new blob” for quite some time. The last one hung around for nearly a year and a half, I don’t think this alone will be much different.

  7. Rich says:

    Sea temperatures of 65-68 degrees Fahrenheit I think is what you meant to say

  8. Bette Sinclair says:

    The lightening over the coastline was terrific tonight. It went on for half an hour. Now thunder and rain. . Sky is cloudy. Puffy and throughout the lightening shards the Little Dipper shown brightly. What interesting weather. Roads End. Lincoln city.

    Sent from my iPhone

  9. Ken in Wood Village says:

    Thank you for the update Mark. Hopefully we will see a very active day tomorrow in the Portland area. Tuesday’s storm looks very exciting, just like a fall storm 🙂
    First 🙂

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