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) has cooled us down with increasing onshore airflow. The cool-down should last most of the week but the computer  models are conflicted over the chance of any precipitation. A frontal system will be on its way to us Monday bringing the slight chance of drizzle at night. By Thursday a frontal system will have passed through the Pacific Northwest continuing the slight chance of showers. As much as we need some rain I’m sure most of us are hoping that it is dry and warm for the long Labor day weekend September 3rd through 5th.

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Air Quality Index:

Eugene-Springfield: The Air Quality Index is 19 in the Good category measuring Ozone.

Oakridge: The Air Quality Index is 13 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 19 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 A COMBINATION OF STRONG WINDS AND LOW RELATIVE HUMIDITY FROM NOON UNTIL 9 PM MONDAY FOR THE KLAMATH BASIN, THE FREMONT-WINEMA NATIONAL FOREST, AND THE SOUTH CENTRAL OREGON DESERT INCLUDING THE THE BLM LAND IN EASTERN LAKE COUNTY AND WESTERN HARNEY COUNTY.
• A RED FLAG WARNING IS IN EFFECT FOR A COMBINATION OF STRONG WINDS AND LOW RELATIVE HUMIDITY FROM NOON UNTIL 8 PM MONDAY FOR THE BLM LAND IN BURNS, VALE AND THE BAKER VALLEY.
• 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:

• Clear this evening, becoming mostly cloudy late tonight,
• Partly cloudy Monday AM, mostly sunny and a bit cooler in the afternoon, partly cloudy with a slight (20%) chance of patchy drizzle late Monday night and Tuesday AM, a mix of clouds and sun and a bit cooler with a slight (20%) chance of showers in the afternoon, partly cloudy with a slight (20%) chance of showers in the evening, cloudy with a (40%) chance of showers late Tuesday night,
• Mostly cloudy and a bit cooler Wednesday with a good (50%) chance of showers, a (30%) chance of showers in the evening, then mostly cloudy with a slight (20%) chance of showers late Wednesday night,
• lows 53-57 cooling to 52 Wednesday night highs 80-72.
• A  mix of clouds and sun and a bit cooler with a (30%) chance of showers Thursday, mostly cloudy with a slight (20%) chance of evening showers, partly cloudy with a slight (20%) chance of showers late Thursday night,
• A mix of clouds and sun and a bit cooler with a slight (20%) chance of showers Friday, mostly cloudy with a slight (20%) chance of evening showers, just partly cloudy late Friday night,
• A mix of clouds and sun and a bit cooler Saturday, mostly cloudy in the evening, partly cloudy late Saturday night,
• Then partly cloudy with a slight (20%) chance of showers Sunday afternoon.
• highs 72-78 lows 55-50. (seasonal averages high 81 low 50)

 

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Forecast for Roseburg:

• Mostly clear this evening, partly cloudy late tonight,
• Mostly cloudy in the AM, sunny and a bit cooler Monday afternoon, mostly clear in the evening, mostly cloudy late Monday night and Tuesday AM, partly cloudy and a bit cooler in the afternoon, partly cloudy with a (30%) chance of showers late Tuesday night,
• Mostly cloudy with a slight (20%) chance of AM showers, partly cloudy and a bit cooler with a slight (20%) chance of showers Wednesday afternoon and evening, then mostly cloudy with a slight (20%) chance of showers late Wednesday night.
• lows 56-54 highs 84-74.
• Mostly cloudy with a slight (20%) chance of showers Thursday AM, partly cloudy and a bit warmer with a slight (20%) chance of showers in the afternoon through Friday, mostly cloudy with a slight (20%) chance of showers Friday night,
• Then partly cloudy with a slight (20%) chance of showers Saturday through Sunday (a bit warmer Sunday).
• highs 78-80 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 and a slight (20%) chance of drizzle late tonight and Monday AM, otherwise mostly cloudy and a bit warmer Monday afternoon, partly cloudy to mostly cloudy in the evening, mostly cloudy Monday night with a slight (20%) chance of  coastal showers late at night,
• Mostly cloudy and a bit warmer with a slight (20%) chance of coastal showers Tuesday while mostly cloudy inland in the AM and partly cloudy and a bit warmer inland in the afternoon, mostly cloudy with a (30%) chance of coastal showers at night while partly cloudy in the evening inland and mostly cloudy with a (30%) chance of showers inland late Tuesday night,
• Mostly cloudy and a bit warmer with a (40%) chance of showers Wednesday, partly cloudy with a slight (20%) chance of evening showers, then mostly cloudy with a slight (20%) chance of showers Wednesday night.
• lows 52-54 highs 64-67 cooling back to 64 Wednesday.
• Mostly cloudy with a slight (20%) chance of showers Thursday AM, partly cloudy and a bit warmer with a slight (20%) chance of showers in the afternoon and Thursday night,
• Mostly cloudy with a slight (20%) chance of showers Friday and Friday night ,
• Then partly cloudy with a slight (20%) chance of showers Saturday through Sunday..
• highs near 66 lows near 53. (seasonal averages high 66 low 52)

 

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Forecast for the Cascades in Lane County:

• Clear tonight,
• 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, mostly cloudy with a slight (20%) chance of showers late Tuesday night,
• Cloudy Wednesday AM with a (40%) chance of showers, partly cloudy and a bit cooler Wednesday afternoon with a (40%) chance of showers, partly cloudy with a (30%) chance of evening showers, then just a slight (20%) chance of showers late Wednesday night.
• free air freezing level 14,000 ft. tonight, 13,000 ft. Monday and Monday night, snow level above 8,000 ft. Tuesday through Wednesday night.
• lows 48-42 highs 69-62.
• Partly cloudy with a slight (20%) chance of showers Thursday afternoon and at night,
• A mix of clouds and sun and a bit cooler with a slight (20%) chance of showers Friday, mostly cloudy with a slight (20%) chance of evening showers, partly cloudy with a slight (20%) chance of showers and a bit cooler Friday night through Saturday evening, just partly cloudy late Saturday night,
• Mostly sunny Sunday AM, then partly cloudy and a bit warmer Sunday afternoon.
• snow level above 8,000 ft. Thursday through Saturday night, then free air freezing level 10,000 ft Sunday.
• highs 62-58 warming to 64 Sunday lows 42-37 warming to 40 Saturday night.

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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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