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.

________________

 

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.

________________

Air Quality Index:

Eugene-Springfield: The Air Quality Index is 28 in the Good category measuring Particulate Matter.

Oakridge: The Air Quality Index is 23 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 29 in the Good category measuring Particulate Matter.

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

________________

 

Advisories:

• A RED FLAG WARNING IS IN EFFECT FOR GUSTY WILDS AND LOW RELATIVE HUMIDITY FROM 1 PM THIS AFTERNOON 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.

 

________________

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

• Mostly sunny and cooler this afternoon, partly cloudy this evening, mostly cloudy late tonight,
• Partly cloudy Sunday AM, mostly sunny in the afternoon, mostly clear Sunday night,
• Partly cloudy and a bit cooler Monday, mostly clear in the evening, then mostly cloudy late Monday night.
• highs 86-80 lows near 54.
• Mostly cloudy and a bit cooler with a slight (20%) chance of showers Tuesday afternoon through Wednesday night,
• A slight (20%) chance of showers Thursday AM, a mix of clouds and sun and a bit cooler with a (30%) chance of showers in the afternoon and Thursday night,
• Then mostly cloudy and a bit cooler with a (40%) chance of showers Friday.
• highs 77-73 lows 56-52 warming to 55 Friday. (seasonal averages high 82 low 50)

 

________________

 

 

Forecast for Roseburg:

• Sunny and cooler this afternoon and Sunday, mostly clear both nights,
• Partly cloudy in the AM, sunny and a bit cooler Monday afternoon, then partly cloudy Monday night.
• highs 92-86 lows near 55.
• Partly cloudy and a bit cooler Tuesday and in the evening, mostly cloudy with a slight (20%) chance of showers and a bit cooler late Tuesday night through Friday.
• highs 82-74 lows 54-52. (seasonal averages high 83 low 55)

 

________________

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

• Sunny this afternoon and  a bit cooler, partly cloudy this evening, mostly cloudy with patchy fog late tonight at the shore,
• Mostly cloudy with patchy AM coastal fog, sunny Sunday afternoon , partly cloudy in the evening, mostly cloudy late Sunday night,
• Mostly cloudy patchy AM fog, sunny and a bit cooler Monday afternoon, partly cloudy in the evening, then mostly cloudy with patchy fog late Monday night.
• highs 64-62 lows 52-54.
• Mostly cloudy with patchy AM fog, a slight (20%) chance of showers and a bit warmer Tuesday afternoon through Friday (a bit cooler Thursday and Friday).
• highs 66-63 lows 55-52. (seasonal averages high 66 low 53)

 

________________

 

Forecast for the Cascades in Lane County:

• Sunny and a bit cooler today and Sunday, mostly clear at night,
• Mostly sunny and a bit cooler Monday, partly cloudy Monday night.
• free air freezing level 15,000 ft. lowering to 14,000 ft. this afternoon, 14,000 ft. tonight through Sunday night, 14,000 ft. lowering to 13,000 ft. Monday and Monday night.
• highs 76-73 lows 47-45.
• Mostly sunny in the AM, partly cloudy and a bit cooler Tuesday afternoon and Tuesday night,
• A mix of clouds and sun and a bit cooler Wednesday,  partly cloudy in the evening, mostly cloudy late Wednesday night,
• Mostly cloudy with a slight (20%) chance of showers and a bit cooler Thursday afternoon and evening, a (40%) chance of showers late Thursday night,
• Then mostly cloudy and a bit cooler with a good (50%) chance of showers Friday.
• free air freezing level 13,000 ft. falling to 12,000 ft. Tuesday, 12,000 ft. Tuesday night, 11,000 ft. Wednesday, 12,000 ft. Wednesday night, snow level above 8,000 ft. Thursday and Thursday night, then 7,000 ft. Friday.
• highs 67-58 lows 43-40.

________________

**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.

________________

Get your local Eugene-Springfield and Lane County news on-line at eugenedailynews.com.

_______________