Here is my new weekly weather quiz question. What is “Undertow?” 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 with blue arrows) has taken over returning westerly airflow which is cooling us off. Don’t expect the cooler weather to last because upper level high pressure (“Arch” shape in blue arrows) will take over by midweek warming us back up. We’re back on our roller coaster again with cooling followed by heating then followed by cooling over the weekend.

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Air Quality Index:

Eugene-Springfield: The Air Quality Index is 35 in the Good category measuring Ozone.

Oakridge: The Air Quality Index is 12 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 34 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 UNTIL 9 PM TONIGHT FOR STRONG WINDS AND LOW RELATIVE HUMIDITY CAUSING HIGH FIRE DANGER FOR THE KLAMATH BASIN, THE FREMONT-WINEMA NATIONAL FOREST AND THE SOUTH CENTRAL OREGON DESERT INCLUDING THE BLM LAND IN EASTERN LAKE COUNTY AND WESTERN HARNEY COUNTY.
• A health advisory has been issued 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 has been issued 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 tonight,
• Mostly sunny and a bit warmer Tuesday, clear at night,
• Sunny and warmer (getting hot again) Wednesday and Thursday, clear both nights.
• lows 50-56 highs 85-98.
• Sunny and just a bit cooler but still hot Friday, mostly clear at night,
• Mostly sunny and cooler Saturday, partly cloudy at night and Sunday AM, mostly sunny in the afternoon and Monday, mostly clear Sunday night.
• highs 95-82 lows 55-53. (seasonal averages high 82 low 51)

 

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Forecast for Roseburg:

• Clear tonight,
• Sunny and a bit warmer Tuesday, Wednesday and Thursday, clear each night.
• lows 52-57 highs 89-100.
• Then sunny Friday through Monday, clear each night.
• highs 94-86 lows 57-55 warming back to 57 Sunday night. (seasonal averages high 84 low 55)

 

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

• Clear tonight,
• Then sunny and a bit warmer Tuesday, Wednesday and Thursday, clear each night.
• lows near 52 highs 65-68.
• Sunny and cooler Friday, mostly clear at night,
• Mostly sunny Saturday, Sunday and Monday, mostly clear each night.
• highs 74-65 lows 55-50. (seasonal averages high 66 low 53)

 

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Forecast for the Cascades in Lane County:

• Clear tonight,
• Then sunny and a bit warmer Tuesday, Wednesday and Thursday, clear each night.
• free air freezing level 14,000 ft. tonight and Tuesday, 15,000 ft. Tuesday night, then 14,000 ft. Wednesday through Thursday night.
• lows 42-52 highs 75-80.
• Sunny and a bit warmer Friday, clear Friday night,
• Mostly sunny and a bit cooler Saturday and Sunday, mostly clear Saturday night, clear Sunday night,
• Then sunny and just a bit warmer Monday.
• free air freezing level 14,000 ft. Friday through Saturday, then 13,000 ft. Saturday night through Monday.
• highs 82-70 warming to 73 Monday lows 48-46.

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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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