Here is my new 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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A weakening area of High Pressure (Shaded “Arch” shape with blue arrows) will keep us dry and in sunshine today and  Wednesday.  Upper level Low Pressure (Shaded “U” shape with blue arrows) gives us the impetus for a change in our weather pattern. A frontal system is shown approaching the coast on Friday. There’s another cause for increased rain chances. Take a look at the frontal system that will be moving through the Pacific Northwest a week from today. The 2016 Olympic Team Trials that run through next Sunday July 10th at Hayward Field will encounter at least a chance of showers, as you can see in the forecast, from Thursday through the rest of the trials.

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Air Quality Index:

Eugene-Springfield: The Air Quality Index is 38 in the good category measuring Particulate Matter.

Oakridge: The Air Quality Index is 13 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 32 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:

• A mix of clouds and sun this afternoon, partly cloudy tonight through Thursday AM, increasing clouds to mostly cloudy with a slight (20%) chance of showers Thursday afternoon, cloudy with a good (50%) chance of rain late Thursday night.
• highs 80-82 cooling back to 80 Thursday lows 50-55.
• Cloudy and cooler with a good (50%) chance of rain Friday and in the evening, rain likely (70%) late Friday night and Saturday AM, showers likely (70%) with a slight (20%) chance of thunderstorms in the afternoon and evening, a good (50%) chance of showers late Saturday night,
• Mostly cloudy with a good (50%) chance of showers Sunday, a good (50%) chance of showers decreasing to a (30%) chance of showers at night,
• Then a mix of clouds and sun and a bit warmer with a slight (20%) chance of showers Monday.
• highs 70-75 lows 53-50. (seasonal averages high 80 low 51)

 

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Eugene-Springfield Pollen Count:

Grass………. High (103)

Trees………. Low (0)

Last Counted: 7/1/16

Data Courtesy of Oregon Allergy Associates.

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Forecast for Roseburg:

• Sunny and a bit cooler this afternoon, mostly clear this evening, partly cloudy late tonight and Wednesday AM, sunny in the afternoon, mostly clear in the evening, partly cloudy late Wednesday night,
• Mostly cloudy Thursday AM, partly cloudy in the evening, then mostly cloudy with a (30%) chance of showers late Thursday night.
• highs near 82 lows 54-58.
• Cloudy with a (40%) chance of showers and a bit cooler Friday through Saturday, mostly cloudy with a (30%) chance of showers Saturday night through Sunday night,
• Then mostly cloudy with a slight (20%) chance of showers Monday.
• highs 69-76 lows 54-52. (seasonal averages high 82 low 55)

 

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

• Sunny this afternoon, partly cloudy this evening, mostly cloudy with patchy coastal fog late tonight and Wednesday AM, sunny in the afternoon, mostly clear in the evening,  mostly cloudy late at night,
• Mostly cloudy inland Thursday AM and sunny in the afternoon while cloudy at the shore in the AM and partly cloudy with a slight (20%) chance of showers in the afternoon, partly cloudy with a (30%) chance of showers in the evening, then mostly cloudy with a (40%) chance of showers Thursday night.
• highs near 65 lows near 52-56.
• Cloudy with a good (50%) chance of showers Friday through Saturday, mostly cloudy with a good (50%) chance of showers Saturday night through Sunday night,
• Mostly cloudy with a slight (20%) chance of showers Monday.
• highs 62-65 lows near 54. (seasonal averages high 64 low 52)

 

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Forecast for the Cascades in Lane County:

• A mix of clouds and sun this afternoon, mostly clear tonight,
• Mostly sunny and a bit warmer Wednesday, partly cloudy at night,
• Mostly sunny Thursday AM, partly cloudy and a bit warmer in the afternoon, then increasing clouds to mostly cloudy with a (40%) chance of rain late Thursday night.
• free air freezing level 11,000 ft. today, 12,000 ft. tonight, 11,000 ft. Wednesday, 14,000 ft. Wednesday night, 14,000 ft. falling to 13,000 ft. Thursday afternoon, then snow level above 8,000 ft. Thursday night.
• highs 66-72 lows 39-45.
• Cloudy with a good (50%) chance of AM showers, cooler with showers likely (60%) Friday afternoon through Saturday AM, showers likely (70%) and a bit cooler in the afternoon through Sunday AM, a good (50%) chance of showers and a bit warmer Sunday afternoon, mostly cloudy with a good (50%) in the evening, partly cloudy with a good (50%) chance showers late Sunday night,
• Partly cloudy with a (40%) chance of showers Monday AM,  then a bit warmer with a slight (20%) chance of showers Monday afternoon.
• snow level above 8,000 ft. Friday, 8,000 ft. Friday night, 7,000 ft. Saturday, 6,500 ft. Saturday night, 6,500 ft. rising to above 8,000 ft. Sunday night, then above 8,000 ft. Monday.
• highs 69-52 warming to 62 Monday lows 42-38.

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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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