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Summer weather is not over yet

September 26, 2018
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Danielle Stevens of Roseburg, top, pushes her 1 1/2-year-old son, Dominic, Tuesday afternoon at Stewart Park in Roseburg. Weather forecasts in Douglas County are calling for high temperatures in the low 90s, and unseasonably warm temp for late September.

For at least the next couple of days, get ready for an encore performance from summer weather.

Meteorologists at the National Weather Service in Medford predict temperatures in the 90s for today and Thursday, and possibly on Friday before the heat breaks and a cooling pattern returns.

“Normal is mid 70s for highs, so yes it is unusual, we expect it to be in the 90s on Wednesday, peaking Thursday,” said meteorologist Marc Spilde.

Spilde said Roseburg could see 90 degrees on Friday, but that depends on the timing of the onshore flow of colder air arriving that day. After that, he said, the temperatures should drop back to a more normal pattern.

High pressure off the Oregon and Washington coast and a low pressure system off the California coast is forcing the warm air into the northwest.

“That’s inducing a thermal low pressure trough over northern California, and it’s basically warming the ground,” Spilde said.

The weather patterns have also caused some pretty strong winds along with low humidity, Spilde said, fueling some fires in southern Oregon counties to become more active.

The Medford area is expecting some of smoke from the fires that have blanketed the Rogue Valley this summer, to return for a couple of days before the air flow changes and moves it out again.

But the high temperatures are not expected to last very long.

“The marine influence will win out eventually as the low pressure offshore gets closer to the coast, and when we see that move onshore this weekend, we’ll see a dramatic cool down,” Spilde said. “But whether or not that will produce rain is still in question.”

While some rain is forecast for Saturday and Sunday, Spilde said not to expect much. And temperatures should drop to near normal, after the heat wave leaves the area some time Friday.

The slight amount of rain in the forecast means little relief from drought conditions in the Umpqua Valley. Roseburg has recorded just 0.06 inch of rain in September and all of that came on Sept. 12. Only 0.03 inch was recorded in August. No rain recorded in the entire month of July.

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