Breezy, Sunny, And First Frost of Fall

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Justin’s Tuesday Night Forecast Discussion:

While it has been particularly dry for most of September (officially only 0.02″), we should start to see the return of the Fall storms bringing the rain. Not so much this week as we’re stuck in a very dry pattern with sunshine, high pressure aloft, and a very dry offshore wind most of the week.

In fact, the only hint of Fall for this week will be a huge Canadian high dropping into the Rockies bringing a much cooler airmass overhead for the next few days. Additionally, a tightening pressure gradient across the state tomorrow will make for a breezy afternoon areawide. Inland sustained winds may reach 20-25 mph with higher wind gusts, the coast will see 30-40mph winds. Red Flag Warnings have been issued for basically all of Western Oregon from the coast to the Cascades through 6pm Thursday as humidity levels will drop below 30% for midweek.

Highs will stay in the low 70s through the end of the week but its the overnight lows that will make it feel a little more Fall-like. With offshore flow, clear skies and winds settling down at night, most areas should be able to drop into the mid to low 30s. Around the cities, I don’t expect a lot of frost but rural areas and those with some elevation will likely see the first frosty mornings of the season.

By the weekend, an upper level low will slowly slide up the Northern California coastline and may bring some high clouds and maybe a stray shower to the Southern Cascades, but that’s about the only rain chances we’ll see on the horizon.

Have a great Wednesday!

Chief Meteorologist Justin Stapleton

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