Here is my weekly weather quiz question. What is a “Thalweg?” Please remember to post your answer as a comment by clicking on “no comments /comments” in the upper right hand portion of this page under the caption, then add your comment. The first person to post the correct answer will win a week of free personalized weather forecasts tailored to your needs. Good luck.

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An upper level high pressure ridge (“Arch” shape in blue arrows) is setting itself up off the Pacific Coast to bring us sunshine and much warmer temperatures. A frontal system will be pushing through Oregon by next Sunday. It looks like another frontal system will be heading our way next Tuesday. You may just want to check out this year’s Perseid Meteor Shower which peaks from today through Sunday August 13th. It is predicted that you could see up to 200 “shooting stars” per hour from debris from the comet Swift-Tuttle. Best viewing is late at night to before sunrise. Make sure you are out far enough away from the city lights so the sky looks darker and the meteorites will be more easily seen.

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Air Quality Index:

Eugene-Springfield: The Air Quality Index is 44 in the Good category measuring Particulate Matter.

Oakridge: The Air Quality Index is 13 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 21 in the Good category measuring Particulate Matter.

Data courtesy of Lane Regional Air Protection Agency (LRAPA).

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Advisories:

• A HEAT ADVISORY IS IN EFECT FROM NOON FRIDAY UNTIL 6 PM SATURDAY FOR THE GREATER PORTLAND METRO AREA, THE CENTRAL WILLAMETTE VALLEY, THE SOUTH WILLAMETTE VALLEY, THE WESTERN COLUMBIA RIVER GORGE AND THE CENTRAL COLUMBIA RIVER GORGE.
• A Blue-Green Algae health advisory is in effect for Odell Lake in Lane County. Water testing has confirmed the presence of blue-green algae and the toxins they produce. People should avoid swallowing water while swimming or inhaling water droplets as a result of high-speed water activities, such as water skiing or power boating, in areas where blooms are identified. Although toxins are not absorbed through the skin, people who have skin sensitivities may experience a puffy, red rash at the affected area.
• A Blue-Green Algae health advisory remains in effect for Howard Bay (sometimes called Howards Bay or Howard’s Bay) in Upper Klamath Lake ONLY. People should avoid swallowing water while swimming or inhaling water droplets as a result of high-speed water activities, such as water skiing or power boating, in areas where blooms are identified. Although toxins are not absorbed through the skin, people who have skin sensitivities may experience a puffy, red rash at the affected area.

 

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Forecast for the Southern and lower Mid Willamette Valley including Eugene-Springfield and Albany-Corvallis:

• Mostly sunny and warmer today, clear tonight,
• Sunny and hot Friday, clear at night,
• Sunny and a bit cooler Saturday, then mostly clear Saturday night.
• highs 92-96 cooling to 94 Saturday lows 55-57.
• Mostly sunny and a bit cooler Sunday, clear in the evening, partly cloudy late at night and Monday AM, mostly and a bit warmer sunny Monday afternoon and Tuesday, mostly clear both nights,
• Then mostly sunny and a bit cooler Wednesday.
• highs 84-87  lows near 55. (seasonal averages high 84 low 52)

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Eugene-Springfield Pollen Count:

Grass………. Low (2)

Trees………. Low (0)

Last Counted: 8/6/16

Data Courtesy of Oregon Allergy Associates.

The Grass and Tree Pollen season is officially over now.

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Forecast for Roseburg:

• Sunny and a bit warmer today, Friday and Saturday (a bit cooler), clear each night,
• highs 93-100 cooling to 97 Saturday lows 62-59.
• Mostly sunny but a bit cooler Sunday, mostly clear at night,
• Mostly sunny and a bit warmer Monday, mostly clear Monday night,
• Then sunny Tuesday and Wednesday (a bit warmer), clear Tuesday night.
• highs 86-90 cooling to 87 Wednesday lows near 58. (seasonal averages high 86 low 56)

 

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Forecast for The South Oregon Coast Including Coos Bay and North Bend:

• Partly cloudy this AM at the shore, sunny this afternoon, mostly clear tonight,
• Sunny Friday, mostly clear Friday night,
• AM coastal clouds otherwise mostly sunny Saturday, then partly cloudy at night.
• highs 67-70 cooling to 66 Saturday lows near 55.
• Partly cloudy Sunday and Sunday night,
• AM clouds, sunny Monday afternoon, mostly clear at night,
• Mostly sunny Tuesday, clear at night,
• Then sunny Wednesday.
• highs near 66 lows near 55. (seasonal averages high 65 low 53)

 

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Forecast for the Cascades in Lane County:

• Sunny and a bit warmer today, Friday and Saturday (a bit cooler), clear each night.
• free air freezing level 15,000 ft. today through Saturday, then 14,000 ft. Saturday night.
• highs 82-85 lows 49-53.
• Sunny and a bit cooler Sunday, clear Sunday night,
• Then sunny and a bit warmer Monday, Tuesday and Wednesday (a bit cooler), clear each night.
• free air freezing level 14,000 ft. Sunday and Sunday night, 15,000 ft. Monday through Tuesday, then 16,000 ft. Tuesday night and  Wednesday.
• highs 74-79 lows 46-48.

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**Because weather forecasting is a combination of science, intuition, and timing there can be no absolute guarantees that individual forecasts will be 100% accurate. Nature is in a constant state of flux and sudden unexpected weather events can happen.

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Get your local Eugene-Springfield and Lane County news on-line at eugenedailynews.com.

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