Here is my weekly weather quiz question for the last time. What are “Stoplogs?” Here is the correct answer. Stoplogs: In hydrologic terms they are large logs, timbers or steel beams placed on top of each other with their ends held in guides on each side of a channel or conduit providing a temporary closure versus a permanent bulkhead gate. 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) is moving up returning the northwest airflow and at least a slight chance of showers to the Pacific Northwest.

 

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Air Quality Index:

Eugene-Springfield: The Air Quality Index is 25 in the good category measuring Ozone.

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

Cottage Grove: The Air Quality Index is 24 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 LIFTED 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 also includes the Crooked River Arms. Tests prove that the toxin levels have dropped to a safe level for humans, but pets still should be kept away from the water at this time.

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Forecast for the Southern and lower Mid Willamette Valley including Eugene-Springfield and Albany-Corvallis:

• Partly cloudy this evening, mostly cloudy late tonight,
• Cloudy in the AM, a mix of clouds and sun and a bit cooler with a slight (20%) chance of showers Sunday afternoon, mostly cloudy with a slight (20%) chance of showers Sunday night through 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 evening showers, then just partly cloudy late Tuesday night.
• lows 54-56 cooling to 53 Tuesday night highs 77-73 warming to 78 Tuesday.
• A mix of clouds and sun Wednesday AM, mostly sunny and a bit warmer in the afternoon, partly cloudy Wednesday night and Thursday AM, mostly sunny and a bit warmer in the afternoon, mostly clear at night,
• Then mostly sunny Friday and Saturday, mostly clear Friday night.
• highs 82-85 lows near 54. (seasonal averages high 83 low 52)

 

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Eugene-Springfield Pollen Count:

Grass………. Moderate (16)

Trees………. Low (2)

Last Counted: 7/12/16

Data Courtesy of Oregon Allergy Associates.

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Forecast for Roseburg:

• Partly cloudy this evening, mostly cloudy late tonight,
• Mostly cloudy with a slight (20%) chance of drizzle Sunday AM, a slight (20%) chance of showers in the afternoon and late Sunday night,
• Mostly cloudy with a slight (20%) chance of AM thunderstorms, a bit cooler with a slight (20%) chance of showers Monday afternoon through Tuesday, then just partly cloudy Tuesday night.
• lows 59-56 highs 78-76 warming to 79 Tuesday.
• Partly cloudy and a bit warmer Wednesday through Thursday, mostly clear Thursday night,
• Then mostly sunny and a bit warmer Friday and Saturday, mostly clear Friday night.
• highs 82-89 lows near 56. (seasonal averages high 85 low 57)

 

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

• Mostly cloudy with a slight (20%) chance of drizzle late tonight and Sunday AM, a slight (20%) chance of showers in the afternoon and late Sunday night,
• Mostly cloudy with a (30%) chance of showers Monday, a slight (20%) chance of showers at night and Tuesday, mostly cloudy in the evening, partly cloudy late Tuesday night.
• lows 57-54 highs near 66.
• Then partly cloudy Wednesday through Saturday.
• highs near 65 lows near 55. (seasonal averages high 65 low 53)

 

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Forecast for the Cascades in Lane County:

• Partly cloudy this evening, mostly cloudy with a slight (20%) chance of showers late tonight,
• Cloudy with a slight (20%) chance of AM showers, a mix of clouds and sun and a bit cooler with a good (50%) chance of showers and thunderstorms Sunday afternoon (under 0.10 in. of rain possible, more in storms), mostly cloudy with a good (50%) chance of showers and thunderstorms Sunday night (0.10 in. of rain possible, more in storms),
• Mostly cloudy with a good (50%) chance of AM showers, a bit cooler with a good (50%) chance of showers and a slight (20%) chance of thunderstorms and a bit cooler Monday afternoon, a (30%) chance of showers and a slight (20%) chance of thunderstorms in the evening, partly cloudy with a slight (20%) chance of showers late Monday night,
• Partly cloudy and a bit warmer with a slight (20%) chance of showers Tuesday afternoon and evening, then just partly cloudy late Tuesday night.
• snow level above 8,000 ft. tonight through Monday night, free air freezing level 11,000 ft. Tuesday AM, snow level above 8,000 ft. Tuesday afternoon and at night.
• lows 45-42 highs 66-62 warming to 68 Tuesday.
• Mostly sunny Wednesday, mostly clear Wednesday night,
• Partly cloudy Thursday AM, mostly sunny in the afternoon, mostly clear at night,
• Then mostly sunny and a bit warmer Friday and Saturday, clear Friday night.
• free air freezing level 12,000 ft. rising to 13,000 ft. Wednesday, 13,000 ft. rising to 14,000 ft. Wednesday night, 14,000 ft. Thursday through Friday night, then 14,000 ft. rising to 15,000 ft. Saturday.
• highs 69-72 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.