Here is my weekly weather quiz question for the last time. What is a “Warm Occlusion?” Here is the correct answer. A Warm Occlusion is a frontal zone formed when a cold front overtakes a warm front and, finding colder air ahead of the warm front, leaves the ground and rises up and over this denser air. Compare with cold occlusion. 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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An upper level high pressure ridge (Shaded “Arch” shape in blue arrows) has weakened enough to allow a weak frontal system  to slip into the Pacific Northwest. High pressure strengthens again next week increasing  the temperatures and removing the chance of precipitation.

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Air Quality Index:

Eugene-Springfield: The Air Quality Index is 38 in the Good category measuring Ozone.

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

Cottage Grove: The Air Quality Index is 33 in the Good category measuring Ozone.

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

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Advisories:

• A RED FLAG WARNING IS IN EFFECT FOR STRONG GUSTY WINDS AND LOW RELATIVE HUMIDITY UNTIL 9 PM TONIGHT FOR THE WESTERN ROGUE BASIN INCLUDING THE ILLINOIS VALLEY, THE SISKIYOU MOUNTAINS, THE EASTERN ROGUE VALLEY AND THE SOUTHERN OREGON CASCADES.
• A Health Advisory remains in effect for ocean water contact at Neskowin Beach located in Tillamook County due to higher than normal levels of fecal bacteria. Contact with the water can result in diarrhea, stomach cramps, skin rashes, upper respiratory infections and other illnesses.Direct contact with the water should be avoided in this area until the advisory is lifted, especially by children and the elderly who may be more vulnerable to waterborne bacteria. Visitors should avoid wading in nearby creeks, pools of water on the beach, or in discolored water, and stay clear of water runoff flowing into the ocean.
• A Health Advisory remains in effect for ocean water contact at Nye Beach located in Lincoln County due to higher than normal levels of fecal bacteria. Contact with the water can result in diarrhea, stomach cramps, skin rashes, upper respiratory infections and other illnesses.Direct contact with the water should be avoided in this area until the advisory is lifted, especially by children and the elderly who may be more vulnerable to waterborne bacteria. Visitors should avoid wading in nearby creeks, pools of water on the beach, or in discolored water, and stay clear of water runoff flowing into the ocean.
• A Blue-Green Algae Health Advisory remains in effect for Agency Lake. Agency Lake is located just north of Upper Klamath Lake near Klamath Falls along Highway 97 in Klamath County. Water monitoring on the lake has confirmed the presence of high levels of blue-green algae and associated toxins that can be harmful to people and animals. Swallowing water while swimming or inhaling water droplets as a result of high-speed water activities, such as water skiing and power boating, should be avoided in areas where blooms are identified. Although toxins are not absorbed through the skin, contact with cells from a bloom can cause skin irritation and a red, puffy rash in individuals with skin sensitivities, or those who develop rashes easily.
• A Blue-Green Algae Health Advisory remains in effect for Howard Bay (sometimes called Howards Bay or Howard’s Bay) in Upper Klamath Lake ONLY. 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, becoming mostly cloudy late tonight,
• A mix of clouds and sun and cooler Sunday, partly cloudy in the evening, clear and colder late Sunday night,
• Sunny and a bit warmer Monday and Tuesday, clear both nights.
• lows 53-43 warming to 46 Tuesday night highs 75-84.
• Sunny and a bit warmer Tuesday, clear at night,
• Sunny and a bit cooler Wednesday, clear Wednesday night,
• Sunny and a bit warmer Thursday, clear at night,
• Then mostly sunny and a bit warmer Friday and Saturday, mostly clear Friday night.
• highs 80-85 lows 48-50. (seasonal averages high 79 low 48)

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College Football Forecast:

Ducks vs Virginia at Autzen Stadium Kickoff 7:30 PM this evening– Mostly clear near 80 degrees and cooling as the game progresses, increasing clouds toward games end, Wind N 5-15 mph.

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Saturday September 17th– Beavers vs Idaho State at Reser Stadium Kickoff 2 PM – Sunny 80 warming to 85 then cooling as the game progresses

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Forecast for Roseburg:

• Clear this evening, mostly cloudy with a slight (20%) chance of patchy drizzle late tonight and Sunday AM, sunny but just a bit cooler in the afternoon, clear at night,
• Sunny Monday and Tuesday, clear both nights.
• lows 58-49 highs 78-85.
• Sunny and a bit cooler Wednesday, mostly clear Wednesday night,
• Mostly sunny Thursday, clear at night,
• Sunny and a bit warmer Friday, mostly clear Friday night,
• Then sunny Saturday.
• highs 84-94 lows 50-54. (seasonal averages high 80 low 52)

 

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

• Partly cloudy this evening, mostly cloudy late tonight with patchy inland drizzle,
• Mostly cloudy Sunday AM, sunny and a bit cooler in the afternoon, mostly clear in the evening, partly cloudy late Sunday night with patchy coastal fog late,
• Patchy AM coastal fog, sunny and a bit warmer Monday afternoon, clear at night,
• Sunny Tuesday, then mostly clear at night.
• lows near 54-49 highs 64-70.
• Mostly sunny and a bit cooler Wednesday, partly cloudy with patchy fog late at night and Thursday AM, mostly sunny in the afternoon, mostly clear at night,
• Mostly sunny and a bit warmer Friday, mostly clear at night,
• Then sunny Saturday.
• highs 66-68 lows 50-52. (seasonal averages high 65 low 51)

 

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Forecast for the Cascades in Lane County:

• Clear this evening, partly cloudy with periods of drizzle and a slight (20%) of showers late tonight,
• Mostly cloudy with patchy drizzle and a slight (20%) chance of showers Sunday AM, partly cloudy and cooler in the afternoon, mostly clear and colder Sunday night,
• Sunny and a bit cooler Monday, mostly clear at night,
• Mostly sunny and a bit warmer Tuesday, then mostly clear Tuesday night.
• snow level above 8,000 ft. tonight and Sunday, free air freezing level 11,000 ft. falling to 9,000 ft. Sunday night, 9,000 ft. Monday, then 11,000 ft. Monday night through Tuesday night.
• lows 45-36 warming to 40 Tuesday night highs 63-60 warming to 67 Tuesday.
• Sunny and a bit warmer Wednesday, Thursday and Friday, clear each night,
• Then mostly sunny and a bit warmer Saturday.
• free air freezing level 11,000 ft. Wednesday, 12,000 ft. Wednesday night and Thursday,  13,000 ft. Thursday night, 14,000 ft. Friday and Friday night, then 15,000 ft. Saturday.
• highs 70-76 lows 40-45.

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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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