Tuesday Recap: Near 100 in Metro Area & Smoke Moving In

August 1, 2017

11pm Tuesday

Today was a scorcher as expected, although temperatures were a notch or two below the forecast high here in Portland

Other parts of the state were incredibly hot

That Medford high and forecast for tomorrow is just amazing.  114???  Wow.

So how will we end up 5-8 degrees warmer tomorrow here in the Willamette Valley?  It’s all about the wind direction.  Today we had weak onshore flow and light westerly flow through the Gorge.  Overnight and tomorrow the hot thermal trough of low pressure shifts west of the Cascades.  That produces light easterly flow through the Gorge and over the Cascades.  Add that to a slightly warmer airmass and it’s going to be a blazing hot day Wednesday…the hottest in 8 years for many of us.  We’re forecasting 105 in Portland, although there is one thing that could drop that temp a few degrees…smoke.

Take a look at the GOES-16 image of smoke surging south from British Columbia wildfires this evening

Soon after 7pm, air quality took a huge tumble in the metro area.  As of 11pm it’s considered UNHEALTHY in Portland.  IF that smoke thickens much more, that will cut down on energy coming from the sun and our temperatures won’t rise as much as expected tomorrow…we could end up at 101 or 102 instead of that 105.  Regardless, it’s going to be a hazy and hot day around here.

Chief Meteorologist Mark Nelsen


Forecast On Track; Warmest Night of Summer Ahead

August 1, 2017

3:30pm Tuesday

It’s a scorcher this afternoon, well into the 90s in the metro area at 3pm:

2017 Current Temps PDX Metro Area Earth Scene

At least the relative humidity is low, so it’s our usual “dry heat”.

We are on track to top out around 98-99 officially in Portland, and several spots in the metro area will likely make it to the century mark (Hillsboro, McMinnville, Aurora).

I expect a warmer night with temperatures remaining in the 80s, then 70s all the way through about 3am.  Eventually we’ll all get down into the 60s so that’s good news

2017 Forecast Tonight Metro

The warmest night so far this summer was 63 during the first heatwave in late June.  By Thursday & Friday mornings we’ll struggle to get below 70 in the urban areas…too warm!

It’s hard to believe, but we expect 6-8 degrees WARMING tomorrow.  Of course that gets us up close to or tying the all-time high of 107 degrees here in Portland.  It’ll be all about the big numbers the next two days as skies stay sunny.

One change tomorrow is the wind…it’ll be lighter and won’t help cool us off as much.  This might help…it’s a cool afternoon at Newport and you’d probably need a jacket out there!  Only 64 with a gusty north wind.

Live Cam Beaches

Tomorrow is the ONE day with hot temperatures on the north coast and the one day that will hit 80 along the central coastline.  A wind reversal (cool southwest wind) arrives early Thursday and that’s nature’s air conditioning.

Stay cool!

Chief Meteorologist Mark Nelsen