Here is my weekly weather quiz question. What is a “Stilling Basin?”  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 is moving through the Pacific Northwest keeping us in showers. Take a look at the frontal system that will be moving in Tuesday. The 2016 Olympic Team Trials that run 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 11 in the good category measuring Particulate Matter.

Oakridge: The Air Quality Index is 9 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 12 in the Good category measuring Particulate Matter.

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

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Advisories:

• A Blue-Green Algae health advisory is in effect issued for Howard Bay (sometimes called Howards Bay or Howard’s Bay) in Upper Klamath Lake. 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.   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 and cooler with rain today (0.25 in. of rain possible), evening showers, a good (50%) chance of showers late tonight (0.25 in. of rain possible),
• Mostly cloudy and a bit warmer with a (40%) chance of showers Saturday (under 0.10 in. of rain possible), cloudy with a good (50%) chance of evening showers, showers likely (70%) late Saturday night (0.25 in. of rain possible),
• Windy with AM showers likely (70%) Sunday, a mix of clouds and sun and a bit cooler with a good (50%) chance of showers and a slight (20%) chance of thunderstorms and a bit warmer Sunday afternoon, mostly cloudy with a (30%) chance of showers and a slight (20%) chance of thunderstorms in the evening, then just partly cloudy late Sunday night.
• highs 67-70 cooling back to 67 Sunday lows 52-50.
• Partly cloudy and warmer with a slight (20%) chance of showers Monday, partly cloudy with a slight (20%) chance of evening showers, mostly cloudy with a slight (20%) chance of showers late Monday night,
• A mix of clouds and sun and a bit warmer with a slight (20%) chance of showers Tuesday, partly cloudy with a slight (20%) chance of showers in the evening, just partly cloudy late Tuesday night and Wednesday AM, mostly sunny and a bit warmer in the afternoon, mostly clear Wednesday night,
• Mostly sunny Thursday AM, then partly cloudy and a bit warmer in the afternoon.
• highs 75-82 lows near 50. (seasonal averages high 81 low 51)

 

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Eugene-Springfield Pollen Count:

Grass………. Moderate (16)

Trees………. Low (0)

Last Counted: 7/7/16

Data Courtesy of Oregon Allergy Associates.

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Forecast for Roseburg:

• Rain likely (70%) this AM, showers this afternoon (0.25 in. of rain possible), cloudy with evening showers, a good (50%) chance of showers late tonight (0.25 in. of rain possible),
• Mostly cloudy with a (30%) chance of showers and a bit warmer Saturday (under 0.10 in. of rain possible), cloudy with a (40%) chance of evening showers, showers likely (70%) at night (0.25 in. of rain possible) and Sunday AM, a good (50%) chance of showers and a bit cooler in the afternoon, then mostly cloudy with a slight (20%) chance of showers Sunday night.
• highs 82-68 lows near 54.
• Mostly cloudy with a slight (20%) chance of showers and a bit warmer Monday through Tuesday, mostly clear at night,
• Then mostly sunny and a bit warmer Wednesday and Thursday mostly clear at night.
• highs 72-80 lows 52-54. (seasonal averages high 83 low 56)

 

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

• Cloudy with rain likely (70%) this AM, showers this afternoon (0.25 in. of rain possible), mostly cloudy with evening showers, a slight (20%) chance of showers late tonight (0.25 in. of rain possible),
• Mostly cloudy with a slight (20%) chance of showers Saturday (under 0.10 in. of rain possible), coastal showers likely (70%) in the evening and showers late at night while a good (50%) chance of evening inland showers and inland showers likely (70%) late Saturday night (0.25 in. of rain possible),
• Cloudy with AM showers likely (60%), a slight (20%) chance of showers Sunday afternoon, then just mostly cloudy late Sunday night.
• highs 63-60 lows near 54.
• Mostly cloudy and a bit warmer Monday, mostly cloudy with a slight (20%) chance of showers Monday night and Tuesday, just partly cloudy Tuesday night,
• Mostly cloudy Wednesday, mostly clear at night,
• Then partly cloudy Thursday.
• highs 60-62 lows 54-52 warming to 58 Wednesday night. (seasonal averages high 64 low 53)

 

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Forecast for the Cascades in Lane County:

• Cloudy with rain today (0.50 in. of rain possible), showers tonight (0.50 in. of rain possible),
• Mostly cloudy and a bit cooler with a good (50%) chance of showers Saturday, showers likely (70%) at night and Sunday AM, a good (50%) chance of showers and a slight (20%) chance of thunderstorms and a bit cooler in the afternoon and evening, then partly cloudy with a slight (20%) chance of showers late Sunday night.
• snow level above 8,000 ft. today and tonight, 7,500 ft. Saturday, 7,000 ft. Saturday night and Sunday, then 7,500 ft. Sunday night.
• highs 57-48 lows 42-37.
• Partly cloudy with a slight (20%) chance of showers Monday AM, just partly cloudy and a bit warmer in the afternoon, partly cloudy with a slight (20%) chance of showers late Monday night and Tuesday AM, just partly cloudy in the afternoon through Wednesday AM, mostly sunny and a bit warmer in the afternoon and Thursday, just mostly clear Wednesday night.
• snow level above 8,000 ft. Monday AM, free air freezing level 10,000 ft. Monday afternoon, snow level above 8,000 ft. Monday night and 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 and Thursday.
• highs 62-72 lows near 40.

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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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