A Nice Summer Lightning Display

June 20, 2018

11:30pm…

Well that was briefly fun.  At least 1/2 of the metro area saw lightning and heard a few rumbles in the distance…a few of you had an excellent show with lots of loud boomers.

From 9:30-11pm thunderstorms fired up in Washington County and then across the south metro down into Clackamas County.  It appears it is most likely over at this point.   This is the radar image from earlier:

KPTV 2017 Default Earth

The movement was interesting as they were stationary at first and then drifted SOUTH or at least propagated that direction.  It wasn’t the south to north we often see in these summer events.  It appears that was due to us being on the backside of the upper-level disturbance as it passes through Oregon.  I see a couple spots in West Linn & Oregon City picked up around .80″ rain, plus viewer Steve Huffman sent in this pic of 3/4″ size hail in the Farmington area south of Hillsboro

photo_stevehuffman

There were also a few strong storms around Stevenson/Carson and the Hood River Valley earlier.  This pic is from Gabor Gardonyi

photo_gaborgardonyi

Unless we get a surprise shower or thick drizzle late tonight or tomorrow morning, it appears this event will leave Portland dry.  It’s back to a major marine push tomorrow, then a thinner marine layer over the weekend.  Summer 2018 rolls on…

Chief Meteorologist Mark Nelsen


9:20pm: A Few Storms Popping Up in Valley/Metro Area

June 20, 2018

It’s been real quiet here in the valleys so far, but in just the last 20 minutes 2-3 thunderstorms have popped up in the West Linn/Oregon City, Molalla, & Scotts Mills area.  First lightning strike of the day in the metro area is around Rosemont Ridge area of West Linn.

KPTV 2017 Default Earth

KPTV 2017 Default Earth2

The upper-level disturbance is doing it’s job.  Keep an eye on the sky the next couple of hours and enjoy any light show we get.

Marine air is pouring inland…check out those chilly valley temps!

Current Temps OrWa Plot 2017

Chief Meteorologist Mark Nelsen


4:15pm: Big Storms Over Cascades, Quiet in Valleys

June 20, 2018

As forecast, big thunderstorms have popped up over the Cascades this afternoon.   The current radar/lightning image:

KPTV 2017 Default Earth

Several have likely produced damaging hail…that possibly only deer, elk, or bears noticed.  Just about all of them have been over forested areas and not in towns.  Although at this moment I see one may be producing large hail very close to Lost Lake
KPTV 2017 Default Earth

These storms have unusually tall tops for our area, at one point I saw one reach 45,000′ as estimated from the radar.

The lack of cloud cover means today is a scorcher in the metro area.  Check out the 94 at PDX this hour!  By far the hottest day of 2018 so far

Current Temps OrWa Plot 2017

The message remains the same for this evening:

  1. Between now and 2am storms may also develop out into the valleys.  Anyone from the Coast Range east could see a thunderstorm, but they will be scattered and not everyone will see one.
  2. Storms will be slow-moving which means some of us could get a huge soaking, while 5 miles away it remains dry.
  3. A strong push of cool marine air arrives west of the Cascades the next few hours (note it’s 20 degrees cooler in Eugene right now!).  Thursday will be mainly cloudy and in the lower 70s

Chief Meteorologist Mark Nelsen