Here is my weekly weather quiz question for the last time. What is a “Stilling Basin?” Here is the correct answer. A Stilling Basin, in hydrologic terms, is a basin constructed to dissipate the energy of fast-flowing water (e.g., from a spillway or bottom outlet), and to protect the streambed from erosion. 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. The answer has to be a comment to win. An email answer will not count. Good luck.

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Upper level Low Pressure (Shaded “U” shape with blue arrows) will move away from us but another upper level low (Shaded “U” shape with blue arrows) will take over by late Monday. A frontal system will slide inland North of us bringing a slight chance of showers Friday.

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Air Quality Index:

Eugene-Springfield: The Air Quality Index is 18 in the good category measuring Ozone.

Oakridge: The Air Quality Index is 5 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 17 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 Howard Bay (sometimes called Howards Bay or Howard’s Bay) in Upper Klamath Lake. It now includes all of Agency and Upper Klamath Lakes. 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 has been issued for the Metolius Arm of Lake Billy Chinook from Perry South Campground to and including the area around Three Rivers Marina, located about 12 miles Southwest of Madras in Jefferson County. It now includes the Crooked River Arms. 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:

• Partly cloudy with a good (50%) chance of evening showers, mostly cloudy with a slight (20%) chance of showers late tonight (under 0.10 in. of rain possible, more in storms),
• Mostly cloudy and a bit warmer Monday, partly cloudy at night,
• A mix of clouds and sun with a slight (20%) chance of showers and a bit cooler Tuesday afternoon, just partly cloudy Tuesday night and Wednesday AM, mostly sunny and a bit warmer in the afternoon, then mostly clear Wednesday night.
• lows 50-53 cooling to 50 Wednesday night highs 77-82.
• Mostly sunny Thursday, mostly clear Thursday night,
• Partly cloudy Friday, partly cloudy with a slight (20%) chance of showers late Friday night,
• A slight (20%) chance of AM showers, a mix of clouds and sun Saturday afternoon, partly cloudy in the evening, mostly cloudy late Saturday night,
• Then a mix of clouds and sun Sunday.
• highs 82-78 lows 50-52. (seasonal averages high 82 low 51)

 

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Eugene-Springfield Pollen Count:

Grass………. Moderate (6)

Trees………. Low (0)

Last Counted: 7/8/16

Data Courtesy of Oregon Allergy Associates.

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Forecast for Roseburg:

• Mostly cloudy with a (30%) chance of showers tonight (under 0.10 in. of rain possible),
• Mostly cloudy in the AM, partly cloudy and a bit warmer Monday afternoon and at night,
• Partly cloudy with a slight (20%) chance of showers Tuesday afternoon, partly cloudy in the evening, mostly clear late Tuesday night,
• Sunny and a bit warmer Wednesday, then clear at night.
• lows 55-53 highs 67-79.
• Sunny and a bit warmer Thursday and Friday, clear Thursday night, then partly cloudy Friday  night through Sunday.
• highs 82-84 cooling back to 82 Friday and Saturday lows near 55. (seasonal averages high 84 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 inland evening showers while a slight (20%) chance of coastal showers tonight (under 0.10 in. of rain possible),
• Mostly cloudy Monday with a slight (20%) chance of AM coastal showers, partly cloudy in the evening, mostly cloudy late Monday night,
• Mostly cloudy Tuesday with a slight (20%) chance of coastal showers while a slight (20%) chance of inland showers in the afternoon, mostly clear Tuesday night,
• Partly cloudy Wednesday AM, sunny in the afternoon, then mostly clear at night.
• lows 55-53 highs near 65.
• Sunny Thursday, mostly clear at night,
• Mostly sunny Friday, then partly cloudy Friday night through Sunday.
• highs near 65 lows 55-53. (seasonal averages high 64 low 53)

 

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Forecast for the Cascades in Lane County:

• Mostly cloudy with evening showers likely (60%), a (30%) chance of showers through late evening, just mostly cloudy late tonight (0.10 in. of rain possible, more in storms),
• Partly cloudy and a bit warmer Monday and Monday night,
• Partly cloudy with a slight (20%) chance of showers Tuesday afternoon, partly cloudy Tuesday night,
• Mostly sunny and a bit warmer Wednesday, then just clear Wednesday night.
• snow level 8,000 ft. tonight, free air freezing level 10,000 ft. Monday, 11,000 ft. Monday night, snow level above 8,000 ft. Tuesday, free air freezing level 12,000 ft. Tuesday night, 12,000 ft. rising to 13,000 ft. Wednesday afternoon, then 13,000 ft. Wednesday night.
• lows 40-43 highs 64-70.
• Sunny and a bit warmer Thursday, clear in the evening, partly cloudy at night,
• Mostly sunny Friday AM, then partly cloudy Friday afternoon through Sunday.
• free air freezing level 13,000 ft. rising to 14,000 ft. Thursday, 14,000 ft. falling to 13,000 ft. late Thursday night, 13,000 ft. Friday, 13,000 ft. falling to 12,000 ft. Friday night, then 12,000 ft. Saturday through Sunday.
• highs 72-65 lows near 44.

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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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