Thursday: Hottest Day In 6 Years

July 30, 2015

What a scorcher today; textbook “extreme heat” here in the lower elevations of southwest Washington and northwest Oregon.  Easterly wind through the Gorge and some over the Cascades gave us the extra heating to pop temperatures into the 100-105 range in the western valleys.

PLOT_Highs_ORWA

PLOT_Highs_Metro

The numbers at Hillsboro, McMinnville, Salem & Eugene were record highs for the day.  Check out those coastal temps too; not hot but nice and warm.

Here in Portland it was the first 100 degree day since August 2012, and the hottest day since the 106 during the heat wave in 2009.

MarkHot_HeatWave_100DegreeDays

Unfortunately, if you don’t have air conditioning, it’s going to be a warm night.  At 10pm it is still 87 in Portland, which is 4 degrees warmer than last night at this time.  We’re going for a low of 66 which would once again tie a record-warm low temperature; we did that last night at 63 degrees.

What changes tomorrow?  The atmosphere overhead doesn’t cool at all, but we lose the offshore flow.  In fact a 10-20 mph westerly wind returns to the Gorge in the afternoon.  The loss of the offshore flow (but no onshore flow) should drop our temperatures 3-4 degrees.  So…probably still a high of 100 degrees once again.  We haven’t seen back to back 100 degree days in 6 years either.

After that, a gradual cooldown over the weekend and then all models put us back into refreshing onshore flow and the hot ridge goes away next week.  Back to normal temps (around 80) or maybe even a bit cooler at times.

Chief Meteorologist Mark Nelsen


Hunker Down in a Cool Spot…100+ Likely Today!

July 30, 2015

9am Thursday…

Today should be our hottest day in 3 years in Portland.  The airmass overhead has warmed a few degrees, we actually have an easterly wind blowing through the Gorge, and it’ll be sunny the entire day.  By 5pm we can expect to see widespread 99-103 degree temperatures through the Willamette Valley and Portland metro area.  The last time we hit 100 was in August 2012.  Regardless of the final temp, it’ll be the warmest of summer so far.  Notice no one in the metro area has moved above 99 so far this season:

MarkHot_HeatWave_HottestSoFar

Tomorrow will be a scorcher as well, but probably not 100 degrees.  Then we slowly cool closer to 90 Saturday and Sunday.

Believe it or not, we won’t have a record high in Portland today since this is one of three days we’ve hit 107 degrees; our all-time high.  It happened on July 30, 1965 and then again TWICE during the great 1981 heat wave.  We were 107, then 105, then 107 again over a three day period.  That was August 8-10th, 1981.

MarkHeatWave_NoRecordHotTemps

Chief Meteorologist Mark Nelsen