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Triple-digits expected to return Tuesday

Temperatures in the upper 80s and lower 90s are expected this weekend in the Rogue Valley, but don’t get too comfortable. Another streak of triple-digit days could arrive by Tuesday and last all week, according to the National Weather Service in Medford.

A large ridge of high pressure over the Pacific Ocean is expected to push into Nevada and Arizona, which will set up a flow from the south, pushing warmer air back into southwest Oregon, forecasters explained.

“That’ll have two effects,” meteorologist Brian Nieuwenhuis said. “One, it’s going to warm us up significantly. And two ... any smoke from California is going to float up this way more. That’s not to say we’re going to fill in the valleys. It could be overhead, but it’s very reminiscent of what we saw the last heat wave in that respect.”

From Aug. 14-18, Medford saw four days reach triple digits in Medford. Aug. 15 saw a 108-degree high, tying the city’s daily temperature record. Earlier this week, the Oregon Department of Environmental Quality issued an air quality advisory because of smoke.

“It’s already overhead up above us, and (the ridge) is just going to bring more of it in,” Nieuwenhuis said. “If you look at a satellite image, the smoke is from Yellowstone across to Cape Blanco ... all the way down to California down to L.A. You pick the spot, there’s smoke there.”

Temperatures this weekend are expected in the high 80s or low 90s, forecasters said, which is close to where high temperatures should be this time of year. Air quality should also see a few days of improvement due to decreased smoke and shifting winds. The mercury should see a sharp climb Tuesday.

“And we stay there: Tuesday, Wednesday, Thursday, Friday, into Saturday,” Nieuwenhuis said. “It could be by Saturday we’re starting on the downswing. Getting out that far, it’s hard to say.”

One Weather Service model suggests some cooling toward the end of next week, but it stands alone.

Reach web editor Ryan Pfeil at 541-776-4468 or rpfeil@rosebudmedia.com. Follow him on Twitter @RyanPfeil.

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