Here is my new 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 low (Shaded “circular” shape with blue arrows) moves in cooling us a bit more, then brings the slight chance for showers for tonight and Tuesday. A frontal system will be pushing through the Pacific Northwest by next Sunday. You may just want to check out this year’s Perseid Meteor Shower which peaks from Thursday August 10th 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 a and the meteorites will be more easily seen.

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Air Quality Index:

Eugene-Springfield: The Air Quality Index is 22 in the Good category measuring Ozone.

Oakridge: The Air Quality Index is 10 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 26 in the Good category measuring Ozone.

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

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Advisories:

• 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 cloudy with a slight (20%) chance of showers late tonight,
• Mostly cloudy with a (30%) chance of morning showers, possible sun breaks with a slight (20%) chance of showers Tuesday afternoon (under 0.10 in. of rain possible), just partly cloudy Tuesday night and Wednesday AM, mostly sunny and a bit warmer Wednesday afternoon,  mostly clear at night,
• Sunny and a bit warmer Thursday, then clear at night.
• lows 57-52 warming to 55 Thursday night highs 75-90.
• Mostly sunny Friday and Saturday, mostly clear Friday night, partly cloudy Saturday night,
• Then partly cloudy and a bit cooler Sunday through Monday.
• highs 95-82 lows near 56. (seasonal averages high 84 low 52)

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Eugene-Springfield Pollen Count:

Grass………. Low (0)

Trees………. Low (0)

Last Counted: 8/5/16

Data Courtesy of Oregon Allergy Associates.

The Grass and Tree Pollen season is officially over now.

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Forecast for Roseburg:

• Mostly cloudy with a slight (20%) chance of showers this evening, a slight (20%) chance of rain late tonight,
• Cloudy with a (30%) chance of AM rain, partly cloudy and a bit cooler Tuesday afternoon through Wednesday AM, sunny and a bit warmer Wednesday afternoon, mostly clear at night,
• Sunny and a bit warmer Thursday, then clear Thursday night.
• lows 60-56 warming back to 60 Thursday night highs 78-94.
• Sunny and a bit warmer Friday, mostly clear Friday night,
• Mostly sunny but a bit cooler Saturday and Sunday, mostly clear Saturday night, then partly cloudy Sunday night and Monday (a bit warmer).
• highs 98-83 warming to 87 Monday lows 62-57. (seasonal averages high 86 low 56)

 

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

• Mostly cloudy with a slight (20%) chance of showers this evening, a slight (20%) chance of rain late tonight and Tuesday AM, mostly cloudy in the afternoon, partly cloudy Tuesday night,
• Partly cloudy Wednesday AM, sunny in the afternoon, mostly clear Wednesday night,
• Mostly sunny Thursday, then mostly clear at night.
• lows near 55 highs near 66.
• Mostly sunny Friday, partly cloudy Friday night,
• Then partly cloudy Saturday through Monday.
• highs near 66 lows near 55. (seasonal averages high 65 low 53)

 

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Forecast for the Cascades in Lane County:

• Mostly cloudy with a slight (20%) chance of showers late tonight and Tuesday AM, partly cloudy with a slight (20%) chance of showers in the afternoon and Tuesday night,
• Partly cloudy Wednesday AM, mostly sunny and a bit warmer in the afternoon, mostly clear Wednesday night,
• Sunny and a bit warmer Thursday, then clear Thursday night.
• snow level above 8,000 ft. tonight and Tuesday, free air freezing level 12,000 ft. Tuesday night and Wednesday, 14,000 ft. Wednesday night, then 15,000 ft. Thursday and Thursday night.
• lows 44-42 warming to 50 Thursday night highs 60-80.
• Sunny and a bit warmer Friday, mostly clear at night,
• Mostly sunny and a bit cooler Saturday and Sunday, mostly clear both night,
• Partly cloudy Monday AM, then mostly sunny in the afternoon.
• free air freezing level 15,000 ft. Friday, 16,000 ft. Friday night and Saturday, 15,000 ft. Saturday night, 14,000 ft. Sunday, 15,000 ft. Sunday night, then 14,000 ft. Monday.
• highs 84-74 lows 52-45.

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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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