Brief Heat Wave Ends, But Summer Continues

July 2, 2013

6pm Tuesday…

We failed to hit 90 here in Portland today as we saw just enough cooling working in off the Pacific Ocean to keep the temps down a few degrees.


Anywhere within 10-20 miles of the Columbia River from Kelso to Troutdale was a bit cooler today as well.  Now down in the Willamette Valley the cooling didn’t penetrate very far.  Salem and Eugene hit 93 and 96 respectively, still plenty hot!  Take at look at the highs eastside…a real scorcher:



By the way, today was the 3rd day in a row with a record warm overnight temp, that’s assuming we don’t drop below 63 before midnight…very unlikely:


Slightly increased onshore flow tomorrow means slightly cooler temps again, probably just 85 at best here in the metro area.  Then much cooler temps Thursday-Saturday as a decent upper-level trough passes by to the north.  The 500mb heights go from around 592dm right now to 575dm Friday morning.  This setup usually produces a big onshore push, but most likely not deep enough for morning drizzle inland.  Then some ridging (though not strong) rebounds Sunday into the middle of next week.

Very good model agreement (surprise!) on these pattern changes the next 7 days.  Look at the 12z GFS and 12z ECMWF ensemble charts:



Both show the big dip to below average Thursday night and Friday then warming afterwards.

So no rain in sight and summer weather is here…enjoy!

Chief Meteorologist Mark Nelsen