Here is my weekly weather quiz question for the last time. What are “Striations?” Here is the correct answer. Striations are Grooves or channels in cloud formations, arranged parallel to the flow of air and therefore depicting the airflow relative to the parent cloud. Striations often reveal the presence of rotation, as in the barber pole or “corkscrew” effect often observed with the rotating updraft of a Low Precipitation (LP) storm. 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. Good luck.

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Upper level high pressure (Shaded “Arch” shape with blue arrows) takes over and strengthens. The pretty “fair” weather for the wrap-up of the Lane County Fair. Weak low pressure will try to cool us down a bit on Monday. It looks like the only frontal system to move toward the Pacific Northwest will be to our North next Saturday.

 

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Air Quality Index:

Eugene-Springfield: The Air Quality Index is 40 in the good category measuring Ozone.

Oakridge: The Air Quality Index is 14 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 39 in the Good category measuring Ozone.

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

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Advisories:

• A Public Health Advisory for higher-than-normal levels of fecal bacteria in ocean waters at D River Beach, located in Lincoln county has been LIFTED. Officials do recommend that people  stay away from pools of water on the beach and runoff from those pools that are frequented by birds.
• A Blue-Green Algae health advisory remains 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.

 

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

• Clear this evening, partly cloudy tonight,
• Mostly cloudy early Monday morning, sunny in the afternoon, clear Monday night,
• A mix of clouds and sun early Tuesday AM, sunny and a bit cooler in the afternoon, clear at night,
• Mostly sunny and a bit warmer Wednesday, then clear at night.
• lows 55-58 cooling to 54 Tuesday night warming to 57 Wednesday night highs 87-85 warming to 89 Wednesday.
• Sunny Thursday, Friday and Saturday, clear Thursday night and Friday night, clear in the evening and mostly cloudy late Saturday night,
• A mix of clouds and sun early Sunday AM, then sunny and a bit cooler in the afternoon.
• highs 93-96 cooling to 82 Sunday lows 60-54. (seasonal averages high 84 low 52)

 

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Eugene-Springfield Pollen Count:

Grass………. Low (2)

Trees………. Low (0)

Last Counted: 7/18/16

Data Courtesy of Oregon Allergy Associates.

The Grass and Tree Pollen season is officially over now.

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Forecast for Roseburg:

• Clear tonight,
• Mostly cloudy in the AM, sunny in the afternoon, clear at night Monday through Wednesday night.
• lows near 60 highs 86-93.
• Partly cloudy and a bit warmer Thursday through Saturday night,
• Mostly cloudy Sunday AM, then sunny and cooler Sunday afternoon.
• highs 94-96 cooling to 82 Sunday lows 62-64 cooling back to 62 Saturday night. (seasonal averages high 86 low 57)

 

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

• Clear this evening, partly cloudy tonight with a slight (20%) chance of patchy coastal drizzle late,
• Mostly cloudy Monday AM with a slight (20%) chance of coastal drizzle, just mostly cloudy in the afternoon, clear in the evening, partly cloudy Monday night with a slight (20%) chance of patchy coastal drizzle late,
• Mostly cloudy Tuesday with a slight (20%) chance of AM coastal drizzle, sunny Tuesday afternoon, clear in the evening,  partly cloudy late at night,
• Mostly cloudy Wednesday, clear in the evening, then partly cloudy late Wednesday night.
• lows 58-56 highs 65-68 cooling to 66 Wednesday.
• Partly cloudy Thursday through Friday night,
• Mostly cloudy Saturday through Sunday AM, then becoming sunny Sunday afternoon.
• highs 68-65 lows 59-62. (seasonal averages high 65 low 53)

 

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Forecast for the Cascades in Lane County:

• Clear tonight,
• Partly cloudy early Monday morning, sunny and a bit cooler in the afternoon, clear Monday night,
• Mostly sunny and a bit cooler Tuesday, clear at night,
• Sunny and a bit warmer Wednesday, then clear at night.
• free air freezing level 15,000 ft. tonight through Tuesday, 16,000 ft. Tuesday night, 15,000 ft. Wednesday, then 16,000 ft. Wednesday night.
• lows 52-46 warming to 50 Wednesday night highs 78-76 warming to 80 Wednesday.
• Sunny and a bit warmer Thursday and Friday, clear both nights,
• Sunny Saturday AM, partly cloudy and a bit cooler in the afternoon, mostly clear Saturday night,
• Then sunny and a bit cooler Sunday.
• free air freezing level 16,000 ft. Thursday through Saturday, then 15,000 ft. Saturday night and Sunday.
• highs 83-86 cooling to 72 Sunday lows 52-55.

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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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