Here is my weekly weather quiz question for the last time. What is a “Thalweg?” Here is the correct answer. A Thalweg: In hydrologic terms, the line of maximum depth in a stream. The thalweg is the part that has the maximum velocity and causes cutbanks and channel migration. I’ll have a new weekly weather quiz question for you starting Monday. 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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The upper level airflow will increase from the West today cooling us out of the mid 90s. It looks like a frontal system will be heading our way Tuesday with very little or no effect on our weather except to keep us a bit cooler. Another frontal system slides through the Pacific Northwest Thursday. You may just want to check out this year’s Perseid Meteor Shower which peaks through tonight. 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 24 in the Good category measuring Particulate Matter.

Oakridge: The Air Quality Index is 20 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 30 in the Good category measuring Particulate Matter.

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

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Advisories:

• A RED FLAG WARNING FOR GUSTY WINDS AND LOW RELATIVE HUMIDITY IS IN EFFECT UNTIL 10 PM TONIGHT FOR THE EAST SLOPES OF THE NORTHERN OREGON CASCADES AND THE LOWER COLUMBIA BASIN OF OREGON.
• A RED FLAG WARNING FOR ABUNDANT LIGHTNING ON DRY FUELS IS IN EFFECT FROM 2 PM UNTIL 8 PM TODAY FOR THE WESTERN KLAMATH NATIONAL FOREST.
• A FIRE WEATHER WATCH IS IN EFFECT FROM THIS AFTERNOON THROUGH THIS EVENING FOR THE THE SOUTHERN OREGON CASCADES, THE KLAMATH BASIN AND THE FREMONT-WINEMA NATIONAL FOREST.
• A Blue-Green Algae health advisory in effect for Odell Lake in Lane County has been lifted. 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 a bit cooler today, clear this evening, mostly cloudy late tonight and Monday AM, sunny and a bit cooler Monday afternoon, clear at night,
• Partly cloudy in the AM, sunny Tuesday, then clear Tuesday night.
• highs 89-86 warming to 88 Tuesday lows near 54.
• Then sunny and a bit warmer Wednesday, Thursday (a bit warmer), Friday and Saturday, clear each night.
• highs 86-92 cooling to 90 Saturday lows near 55. (seasonal averages high 83 low 51)

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Eugene-Springfield Pollen Count:

Grass………. Low (3)

Trees………. Low (0)

Last Counted: 8/11/16

Data Courtesy of Oregon Allergy Associates.

The Grass and Tree Pollen season is officially over now.

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Forecast for Roseburg:

• Partly cloudy in the AM, sunny but a bit cooler this afternoon, clear tonight,
• Partly cloudy in the AM, sunny and a bit cooler Monday afternoon, clear at night,
• Sunny and a bit cooler Tuesday, then clear Tuesday night.
• highs 93-90 lows near 58.
• Then sunny and a bit warmer Wednesday, Thursday, Friday and Saturday, clear each night.
• highs 90-96 lows 56-60. (seasonal averages high 85 low 56)

 

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

• Cloudy with areas of AM coastal fog and a slight (20%) chance of patchy drizzle, sunny this afternoon, partly cloudy this evening, mostly cloudy patchy coastal fog and a slight (20%) chance of drizzle late tonight and Monday AM, sunny Monday afternoon, mostly clear in the evening and cloudy with patchy coastal fog late Monday night while mostly clear inland in the evening and cloudy late at night,
• Then mostly cloudy Tuesday and Tuesday night.
• highs near 66 lows near 54.
• Mostly cloudy Wednesday through Thursday AM, sunny in the afternoon, mostly clear Thursday night,
• Mostly sunny and a bit warmer Friday, then partly cloudy and a bit warmer Friday night and Saturday.
• highs 65-68 lows 53-55. (seasonal averages high 65 low 53)

 

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Forecast for the Cascades in Lane County:

• Mostly sunny this AM, partly cloudy and a bit cooler this afternoon, mostly clear tonight,
• Sunny and a bit cooler Monday, clear at night,
• Sunny and a bit warmer Tuesday, clear at night.
• free air freezing level 15,000 ft. today through Tuesday night.
• highs 79-77 warming back to 79 Tuesday lows 47-49.
• Then sunny and a bit cooler Wednesday, Thursday (a bit warmer), (a bit cooler) Friday and Saturday, clear each night,
• free air freezing level 15,000 ft. Wednesday, 16,000 ft. Wednesday night through Friday, then 15,000 ft. Friday night and Saturday.
• highs 82-80 warming to 82 Thursday and Friday lows near 50.

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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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