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. Some pretty “fair” weather for the Lane County Fair that continues through Sunday. 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 36 in the good category measuring Ozone.

Oakridge: The Air Quality Index is 10 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 37 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:

• Mostly clear tonight,
• Partly cloudy in the AM, sunny and a bit warmer Sunday afternoon, mostly clear at night,
• AM clouds and sun, sunny and a bit cooler Monday afternoon, clear in the evening, then mostly cloudy Monday night,
• AM clouds, sunny and a bit warmer Tuesday afternoon, then clear at night.
• lows 54-58 cooling to 55 Tuesday night highs 88-83 warming to 86 Tuesday.
• Then sunny and a bit warmer Wednesday, Thursday, Friday and (a bit cooler) Saturday, clear each night.
• highs 88-96 cooling back to 88 Saturday lows 56-60. (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,
• AM clouds, sunny in the afternoon, clear at night Sunday, Monday and Tuesday.
• lows 56-60 highs 87-89.
• Mostly cloudy Wednesday AM, sunny and a bit warmer in the afternoon, mostly clear at night,
• Mostly sunny and a bit warmer Thursday, mostly clear at night,
• Mostly sunny and a bit warmer Friday, mostly clear at night,
• Partly cloudy Saturday AM, then mostly sunny and a bit cooler with a slight (20%) chance of afternoon thunderstorms.
• highs 93-96 cooling back to 93 Saturday lows 60-64. (seasonal averages high 86 low 57)

 

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

• Clear tonight,
• Partly cloudy Sunday AM, sunny in the afternoon, clear in the evening, increasing clouds to mostly cloudy Sunday night with a slight (20%) chance of coastal drizzle late at night and Monday AM, sunny Monday afternoon,  clear in the evening, then mostly cloudy Monday night with a slight (20%) chance of coastal drizzle late,
• Mostly cloudy with a slight (20%) chance of AM coastal drizzle, sunny Tuesday afternoon, then partly cloudy at night.
• lows 56-58 cooling back to 56 Tuesday night highs near 66.
• Partly cloudy Wednesday through Friday night,
• Mostly cloudy in the AM, then sunny Saturday afternoon.
• highs 66-68 lows 55-58. (seasonal averages high 65 low 53)

 

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Forecast for the Cascades in Lane County:

• Clear tonight,
• Sunny and a bit warmer Sunday, clear at night,
• Mostly sunny and a bit cooler Monday, clear in the evening, partly cloudy at night and Tuesday AM, sunny in the afternoon, then clear Tuesday night.
• free air freezing level 14,000 ft. tonight, 14,000 ft. rising to 15,000 ft. Sunday, 15,000 ft. Sunday night through Monday night, then 16,000 ft. Tuesday and Tuesday night.
• lows 45-50 cooling to 47 Tuesday night highs 79-76.
• Sunny and a bit warmer Wednesday, (warmer) Thursday and Friday, clear each night,
• Sunny Saturday AM, then partly cloudy and a bit cooler in the afternoon.
• free air freezing level 15,000 ft. Wednesday, then 16,000 ft. Wednesday night through Saturday.
• highs 76-84 cooling to 78 Saturday 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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