Here is my 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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As predicted upper level high pressure (“Arch” shape in blue arrows) is taking over warming us back up. We’re on our roller coaster again with heating followed by cooling over the weekend as a cold front slides through on Sunday.

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Air Quality Index:

Eugene-Springfield: The Air Quality Index is 30 in the Good category measuring Particulate Matter.

Oakridge: The Air Quality Index is 16 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 24 in the Good category measuring Particulate Matter.

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

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Advisories:

• A RED FLAG WARNING IS IN EFFECT FOR DRY AND SIGNIFICANTLY UNSTABLE CONDITIONS UNTIL 9PM TONIGHT FOR THE NORTH OREGON COAST, THE COAST RANGE OF NORTHWEST OREGON, THE CENTRAL COAST RANGE OF WESTERN OREGON, THE GREATER PORTLAND METRO AREA, THE CENTRAL WILLAMETTE VALLEY, THE SOUTH WILLAMETTE VALLEY, THE WESTERN COLUMBIA RIVER GORGE, THE CENTRAL COLUMBIA RIVER GORGE, THE NORTH OREGON CASCADE FOOTHILLS, THE CASCADE FOOTHILLS IN LANE COUNTY, THE MT. HOOD NATIONAL FOREST, WEST OF CASCADE CREST, THE WILLAMETTE NATIONAL FOREST, THE UPPER HOOD RIVER VALLEY AND THE CENTRAL OREGON COASTAL STRIP. (IN CASE YOU DIDN’T NOTICE THAT INCLUDES ALL OF WESTERN OREGON FROM THE OREGON COAST RANGE TO THE CASCADE FOOTHILLS.)
• A RED FLAG WARNING IS IN EFFECT FOR STRONG GUSTY WINDS AND LOW RELATIVE HUMIDITY THROUGH 11 PM TONIGHT FOR THE UMPQUA BASIN, THE UMPQUA NATIONAL FOREST, THE SOUTHERN OREGON COAST, THE WESTERN ROGUE RIVER, THE SISKIYOU NATIONAL FOREST, THE WESTERN ROGUE BASIN INCLUDING THE ILLINOIS VALLEY, AND THE SOUTHERN OREGON CASCADES.
• A HEAT ADVISORY IS IN EFFECT FROM 2 PM TODAY UNTIL 8 PM FRIDAY FOR THE COAST RANGE OF NORTHWEST OREGON, THE CENTRAL COAST RANGE OF WESTERN OREGON, THE GREATER PORTLAND METRO AREA, THE CENTRAL WILLAMETTE VALLEY, THE SOUTH WILLAMETTE VALLEY, THE WESTERN COLUMBIA RIVER GORGE, THE CENTRAL COLUMBIA RIVER GORGE, THE NORTH OREGON CASCADE FOOTHILLS, THE CASCADE FOOTHILLS IN LANE COUNTY AND THE UPPER HOOD RIVER 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:

• Sunny and hot today and Friday, clear tonight, clear in the evening and partly cloudy late Friday night,
• Cloudy Saturday AM, mostly sunny and cooler in the afternoon, clear in the evening, partly cloudy late Saturday night.
• highs 98-100 cooling to 86 Saturday lows near 56.
• Partly cloudy Sunday AM, mostly sunny and a bit cooler in the afternoon, partly cloudy Sunday night,
• Partly cloudy and a bit cooler Monday through Tuesday AM, mostly sunny and a bit cooler Tuesday afternoon, partly cloudy with a slight (20%) chance of showers Tuesday night and Wednesday AM, then mostly sunny Wednesday afternoon.
• highs 85-79 lows 52-55 (seasonal averages high 82 low 50)

 

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Forecast for Roseburg:

• Sunny and a bit warmer (Hot) today and Friday, clear both nights,
• Sunny and cooler Saturday, mostly clear at night.
• highs 99-101 cooling to 92 Saturday lows 57-55.
• Mostly sunny and a bit cooler Sunday, mostly clear Sunday night,
• Mostly sunny and a bit cooler Monday, mostly clear in the evening, partly cloudy late Monday night and Tuesday AM, mostly sunny with a slight (20%) chance of showers in the afternoon, mostly clear with a slight (20%) chance of showers Tuesday night,
• Then mostly sunny and a bit cooler with a slight (20%) chance of showers Wednesday.
• highs 90-82 lows near 55. (seasonal averages high 84 low 55)

 

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

• Sunny and a bit warmer today, clear tonight,
• Sunny and a bit cooler Friday, partly cloudy in the evening and mostly cloudy with patchy coastal fog late Friday night while clear inland at night,
• Cloudy with patchy AM coastal fog, sunny and a bit cooler Saturday afternoon, clear in the evening, then partly cloudy with patchy fog late Saturday night.
• highs 72-64 lows 52-54.
• Partly cloudy with patchy AM fog, mostly sunny Sunday afternoon, partly cloudy Sunday night through Monday evening, mostly cloudy with patchy fog late at night,
• Patchy AM fog, partly cloudy with a slight (20%) chance of showers and a bit warmer Tuesday afternoon and evening, mostly cloudy with a slight (20%) chance of showers Tuesday night and Wednesday AM, then sunny and a bit cooler Wednesday afternoon.
• highs near 65 lows near 53. (seasonal averages high 66 low 53)

 

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Forecast for the Cascades in Lane County:

• Sunny and a bit warmer today and Friday, clear both nights,
• Sunny and a bit cooler Saturday, then clear Saturday night.
• free air freezing level 14,000 ft. today and tonight, then 15,000 ft. Friday through Saturday night.
• highs 79-82 cooling to 76 Saturday lows 50-47.
• Mostly sunny and just a bit cooler Sunday, mostly clear Sunday night,
• Mostly sunny and a bit cooler Monday and Tuesday, mostly clear Monday night, partly cloudy with a slight (20%) chance of showers late Tuesday night,
• Partly cloudy with a slight (20%) chance of showers Wednesday AM, then mostly sunny Wednesday afternoon.
• free air freezing level 14,000 ft. Sunday through Monday night, 12,000 ft. Tuesday, then snow level above 8,000 ft. Tuesday night and Wednesday AM.
• highs 76-70 lows 46-44 warming back to 46 Tuesday 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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