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Here come the 90s: Time for our first heat spell of the summer

Seattle on a sunny day (KOMO Photo)

SEATTLE -- Summer isn't wasting a whole lot of time asserting its reign on Western Washington, with the season's first hot spell looming for the weekend.

High pressure will continue to build along the West Coast during the rest of this week tapping into some of the intense heat that is baking the Desert Southwest. It's bringing the first thermal trough of summer, which will have the added warming bonus of bringing in a hot, east wind.

It looks like it'll be hot enough for the first 90 degree day of the year, especially on Sunday.

Temperatures will remain comfortable on Thursday with highs in the mid 70s, then we could crack the low 80s on Friday.

The heat is then on for Saturday as the thermal trough moves in from Oregon. Highs in the interior should reach the upper 80s to low 90s, with even 80s likely along the coast and North Interior -- that east wind negating any cooling powers of the Pacific Ocean and nearby waters, so not much respite to be found around the region.

The hottest day for most of our area appears to be Sunday as the thermal trough sits parked right over the I-5 corridor. That should push highs into the low 90s in the Puget Sound region, with mid-upper 90s possible south of Olympia and in the foothills. Those should be good to set some new daily temperature records around Western Washington:

The heat is affecting the big MLS soccer match in Portland between arch-rivals Seattle Sounders and Portland Timbers with the kickoff being moved from 1:00 p.m. to 7:30 p.m., the Sounders said. Afternoon highs are expected to reach 95 degrees in the Rose City and the turf will make temperatures even hotter on the playing field.

The coast will begin to see some late day cooling and should have a toasty morning but a cooler afternoon in the 70s as the wind shifts to the west there.

Monday will be the transition day as the thermal trough begins to move east and we begin to flip on our natural air conditioning. For the coast, it'll be a radically cooler day in the 60s with fog, but it'll take until the late evening or early night for that marine push to reach the interior -- too late to prevent another hot day around Seattle with highs in the upper 80s to near 90 again.

The cool rush of the ocean breezes will finally push though the region Monday night, making for a much more comfortable Tuesday with some morning clouds giving way to afternoon sunshine and highs in the low 70s.

Be careful on the water!!!

With the hot weather comes the temptation to head out to the local rivers to cool off, especially as the heat comes on a weekend. Emergency managers are stressing that while it might be 90s outside, river water temperatures are still in the 40s or 50s from mountain snow melt. Time and time again during hot spells the local news is filled with tragic stories of drownings as people go on the water with no life jackets and succumb to the shock of very cold water if they fall or are knocked in.

Wearing a life jacket drastically improves your odds of survival and rescue. Let's keep the heat wave among the lead stories on our web page, not any water emergencies.

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