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) gives us the impetus for the change in our weather pattern. A frontal system moved through the Pacific Northwest keeping us in showers. Take a look at the frontal system that will be moving in Tuesday. High Pressure at the surface (“H” shown offshore) and aloft will take over bringing back the sunshine and warmer temperatures. The 2016 Olympic Team Trials that continue through Sunday at Hayward Field will encounter the chance of showers through the rest of the competition, as you can see in the forecast.

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Air Quality Index:

Eugene-Springfield: The Air Quality Index is 23 in the good category measuring Ozone.

Oakridge: The Air Quality Index is 6 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 22 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:

• Mostly cloudy with showers this AM, showers likely (70%) with a slight (20%) chance of thunderstorms and a bit cooler this afternoon (0.50 in. of rain possible, more in storms), partly cloudy with a good (50%) chance of evening showers, cloudy with a slight (20%) chance of showers late tonight (under 0.10 in. of rain possible, more in storms),
• AM clouds, a mix of clouds and sun and a bit warmer Monday afternoon, partly cloudy at night,
• A mix of clouds and sun with a slight (20%) chance of showers and a bit cooler Tuesday afternoon, then just partly cloudy Tuesday night.
• highs 69-77 cooling to 75 Tuesday lows 52-50.
• Partly cloudy Wednesday AM, mostly sunny and a bit warmer in the afternoon and Thursday, mostly clear both nights,
• AM sun, then partly cloudy Friday afternoon through Saturday.
• highs 82-79 lows near 52. (seasonal averages high 81 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:

• Showers and a slight (20%) chance of thunderstorms this AM, showers and a bit cooler this afternoon (0.25 in. of rain possible), mostly cloudy with a slight (20%) chance of showers tonight (under 0.10 in. of rain possible),
• Mostly cloudy in the AM, sunny and a bit warmer Monday afternoon, partly cloudy Monday night and Tuesday, then mostly clear Tuesday night.
• highs 67-79 lows 55-53.
• Mostly sunny and a bit warmer Wednesday, clear at night,
• Sunny and a bit warmer Thursday and Friday, clear both nights,
• Then mostly sunny and a bit cooler Saturday.
• highs 82-84 cooling back to 82 Friday and Saturday lows near 55. (seasonal averages high 83 low 56)

 

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

• Mostly cloudy with AM showers and a slight (20%) chance of thunderstorms, showers this afternoon (0.25 in. of rain possible), a slight (20%) chance of showers tonight,
• Mostly cloudy and a bit warmer Monday, partly cloudy in the evening, then mostly cloudy late Monday night.
• highs near 65 lows 55-53.
• Partly cloudy Tuesday through Wednesday, mostly clear Wednesday night,
• Sunny Thursday, mostly clear at night,
• Then mostly sunny Friday and Saturday, mostly clear Friday night.
• 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 showers this AM, showers and a slight (20%) chance of thunderstorms and a bit cooler this afternoon (0.50 in. of rain possible, more in storms), evening showers likely (60%) with a slight (20%) chance of thunderstorms, a slight (20%) chance of showers late tonight (0.10 in. of rain possible, more in storms),
• Partly cloudy and a bit warmer Monday and Monday night,
• Then partly cloudy Tuesday and Tuesday night.
• snow level 7,000 ft. today, 8,000 ft. tonight, free air freezing level 10,000 ft. Monday, 11,000 ft. Monday night and Tuesday, then 12,000 ft. rising to 13,000 ft. late Tuesday night.
• highs 50-64 lows 40-43.
• Partly cloudy Wednesday AM, mostly sunny and a bit warmer in the afternoon, just clear Wednesday night,
• Sunny and a bit warmer Thursday and Friday, mostly clear both nights,
• Then mostly sunny and a bit cooler Saturday.
• free air freezing level 13,000 ft. Wednesday,13,000 ft. rising to 14,000 ft. Wednesday night, 14,000 ft. Thursday and Thursday night, 14,000 ft. falling to 13,000 ft. Friday, 13,000 ft. falling to 12,000 ft. Friday night, then 12,000 ft. rising to 13,000 ft. Saturday afternoon.
• 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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