Here is my weekly weather quiz question for the last time. What is “Undertow?” Here is the correct answer.Undertow is a relatively small-scale surf-zone current moving away from the beach. Rip currents form as waves disperse along the beach causing water to become trapped between the beach and a sandbar or other underwater feature. The water converges into a narrow, river-like channel moving away from the shore at high speed. I will 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 low (Shaded “U” shape in blue arrows) is cooling us down away from the record high 90s with increasing onshore airflow. The cool-down should last all week but the computer  models are conflicted over the chance of any precipitation. A frontal system gets stuck just to our north on Monday. Between Wednesday and Thursday the frontal system finally moves through the Pacific Northwest to bring a possible chance of showers our way.

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Air Quality Index:

Eugene-Springfield: The Air Quality Index is 22 in the Good category measuring Ozone.

Oakridge: The Air Quality Index is 15 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 27 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 GUSTY WILDS AND LOW RELATIVE HUMIDITY UNTIL 9 PM TONIGHT FOR THE EAST SLOPES OF THE NORTHERN OREGON CASCADES AND THE LOWER COLUMBIA BASIN OF OREGON
• A health advisory remains in effect for the Ross Island Lagoon and the mouth of the lagoon as it connects to the Holgate Channel. Ross Island Lagoon is located about one river mile south of downtown Portland in Multnomah County. The advisory is being issued due to visual confirmation of a blue-green algae bloom in the lagoon. Oregon Public Health officials advise people to avoid swallowing or inhaling water droplets as a result of swimming or high-speed water activities, such as water skiing and power boating in areas where blooms are identified.
• A 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:

• Partly cloudy this evening, mostly cloudy late tonight,
• Partly cloudy Sunday AM, mostly sunny and a bit cooler in the afternoon, partly cloudy Sunday night through Monday evening, mostly cloudy late Monday night,
• Mostly cloudy and a bit cooler Tuesday, mostly cloudy with a slight (20%) chance of showers in the evening, then a (40%) chance of showers Tuesday night.
• lows 53-56 highs 82-77.
•  A mix of clouds and sun and a bit cooler Wednesday with a (40%) chance of AM showers, a slight (20%) chance of showers in the afternoon, partly cloudy with a slight (20%) chance of showers Wednesday night,
• A  mix of clouds and sun and a bit cooler with a slight (20%) chance of showers Thursday, partly cloudy with a slight (20%) chance of evening showers, mostly cloudy with a (30%) chance of showers late Thursday night,
• Mostly cloudy and a bit cooler with a (30%) chance of showers Friday and Friday night,
• Then a mix of clouds and sun and a bit cooler with a (40%) chance of showers Saturday.
• highs 76-72 lows 52-55 cooling to 50 Saturday. (seasonal averages high 81 low 50)

 

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Forecast for Roseburg:

• Mostly clear tonight,
• Sunny and a bit cooler Sunday, mostly clear in the evening, partly cloudy late Sunday night,
• Mostly cloudy in the AM, sunny and a bit cooler Monday afternoon, partly cloudy at night,
• Mostly cloudy in the AM, sunny and a bit cooler Tuesday afternoon, mostly clear in the evening, mostly cloudy with a slight (20%) chance of showers late Tuesday night.
• lows near 55 highs 92-80.
•  Mostly cloudy and a bit cooler with a slight (20%) chance of showers Wednesday through Thursday, partly cloudy with a slight (20%) chance of evening showers, then mostly cloudy with a slight (20%) chance of showers Thursday night through Saturday.
• highs 78-76 warming back to 78 Saturday lows near 54. (seasonal averages high 83 low 54)

 

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

• Partly cloudy this evening, mostly cloudy with patchy coastal fog late tonight and Sunday AM, sunny in the afternoon, partly cloudy in the evening, mostly cloudy late Sunday night,
• Mostly cloudy with patchy coastal AM fog and drizzle, otherwise partly cloudy and a bit cooler Monday afternoon, mostly cloudy with patchy coastal fog late Monday night.
• Mostly cloudy with patchy AM fog, sunny with a slight (20%) chance of showers and a bit warmer Tuesday afternoon, then mostly cloudy with a (40%) chance of showers Tuesday night.
• lows 52-54 highs 65-62 warming back to 65 Tuesday.
• Mostly cloudy and a bit warmer with a (30%) chance of showers Wednesday, a slight (20%) chance of showers at night and Thursday AM, partly cloudy and a bit warmer with a slight (20%) chance of showers in the afternoon, then mostly cloudy with a slight (20%) chance of showers Thursday night through Saturday.
• highs 67-65 lows near 53. (seasonal averages high 66 low 52)

 

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Forecast for the Cascades in Lane County:

• Mostly clear tonight,
• Sunny and a bit cooler Sunday, clear at night,
• Mostly sunny and a bit cooler Monday, partly cloudy Monday night,
• Partly cloudy and a bit cooler with a slight (20%) chance of showers and thunderstorms Tuesday afternoon and evening, then mostly cloudy with a (30%) chance of showers late Tuesday night.
• free air freezing level 14,000 ft. tonight through Monday night, 13,000 ft. Tuesday AM, snow level above 8,000 ft. Tuesday afternoon and at night.
• lows 47-43 highs 77-67.
• Partly cloudy and a bit cooler Wednesday with a (30%) chance of AM showers, just partly cloudy in the afternoon and Wednesday night,
• A mix of clouds and sun with a slight (20%) chance of showers and a bit cooler Thursday afternoon, partly cloudy with a slight (20%) chance of evening showers, mostly cloudy with a (40%) chance of showers late Thursday night,
• Then a mix of clouds and sun and a bit cooler with a (30%) chance of showers Friday and Saturday, mostly cloudy with a (30%) chance of showers Friday night.
• snow level above 8,000 ft. Wednesday, free air freezing level 11,000 ft. Wednesday night, then snow level above 8,000 ft. Thursday and through Saturday.
• highs 65-55 lows 43-37.

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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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