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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An upper level low (Shaded “U” shape in blue arrows) is cooling us down away from the record high 90s. 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 chance of showers our way.

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Air Quality Index:

Eugene-Springfield: The Air Quality Index is 48 in the Good category measuring Ozone.

Oakridge: The Air Quality Index is 14 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 50 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 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 RED FLAG WARNING IS IN EFFECT FOR GUSTY WILDS AND LOW RELATIVE HUMIDITY FROM 1 PM UNTIL 9 PM SATURDAY FOR THE EAST SLOPES OF THE NORTHERN OREGON CASCADES AND THE LOWER COLUMBIA BASIN OF OREGON
• A FIRE WEATHER WATCH IS IN EFFECT FROM SATURDAY AFTERNOON THROUGH SATURDAY EVENING FOR GUSTY WINDS AND AND LOW RELATIVE HUMIDITY FOR THE EAST SLOPES OF THE NORTHERN OREGON CASCADES AND THE LOWER COLUMBIA BASIN OF OREGON.
• A HEAT ADVISORY IS IN EFFECT UNTIL 8 PM THIS EVENING 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:

• Clear tonight,
• Partly cloudy Saturday AM, mostly sunny and cooler in the afternoon, clear in the evening, partly cloudy late Saturday night,
• 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.
• lows 57-53 highs 86-80.
• A mix of clouds and sun and a bit cooler Tuesday, mostly cloudy with a slight (20%) chance of showers Tuesday night and Wednesday AM, just mostly cloudy and a bit cooler in the afternoon, mostly cloudy with a slight (20%) chance of showers late 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 late Thursday night,
• Then mostly cloudy and a bit cooler with a (40%) chance of showers Friday.
• highs 77-67 lows 56-52. (seasonal averages high 82 low 50)

 

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Forecast for Roseburg:

• Clear tonight,
• Sunny and cooler Saturday, mostly clear Saturday night,
• Mostly sunny and a bit cooler Sunday, mostly clear at night,
• Then partly cloudy and a bit cooler Monday and Monday night.
• lows 56-54 highs 90-84.
• Mostly cloudy Tuesday AM, sunny and a bit cooler in the afternoon, partly cloudy in the evening, mostly cloudy with a slight (20%) chance of showers late Tuesday night and Wednesday AM, partly cloudy in the afternoon and evening, mostly cloudy with a slight (20%) chance of showers late Wednesday night,
• Then mostly cloudy and a bit cooler with a (40%) chance of showers Thursday through Frday.
• highs 82-74 lows 54-52. (seasonal averages high 83 low 55)

 

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

• Mostly cloudy with patchy coastal fog while clear inland tonight,
• Cloudy with patchy fog at the shore in the AM and sunny in the afternoon while sunny and  a bit cooler  inland Saturday afternoon, mostly clear in the evening and mostly cloudy with patchy fog late tonight at the shore while clear in the evening inland and partly cloudy late Saturday night,
• Mostly cloudy with patchy AM coastal fog and partly cloudy Sunday afternoon while sunny and a bit warmer inland Sunday, mostly clear 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 a slight (20%) chance of showers Monday night.
• lows 52-54 highs 70-63 warming to 65 Sunday.
• Mostly cloudy with a slight (20%) chance of showers and a bit warmer Tuesday through Wednesday, a slight (20%) chance of showers late Wednesday night,
• Then mostly cloudy and a bit cooler with a (30%) chance of showers Thursday through Friday.
• highs near 65 lows near 54. (seasonal averages high 66 low 53)

 

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Forecast for the Cascades in Lane County:

• Clear tonight,
• Sunny and a bit cooler Saturday, mostly clear Saturday night,
• Mostly sunny Sunday and Monday, mostly clear Sunday night, partly cloudy Monday night.
• free air freezing level 15,000 ft. tonight through Saturday night, 14,000 ft. Sunday through Monday, then 13,000 ft. Monday night.
• lows 50-45 highs 76-73.
• Mostly sunny and a bit cooler with a slight (20%) chance of showers and thunderstorms Tuesday afternoon, partly cloudy with a slight (20%) chance of showers and thunderstorms in the evening, just partly cloudy late Tuesday night,
• Partly cloudy with a slight (20%) chance of showers and a bit cooler Wednesday afternoon and evening, mostly cloudy with a (30%) chance of showers late Wednesday night and Thursday AM, a slight (20%) chance of showers and a bit cooler in the 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.
• snow level above 8,000 ft. Tuesday through Thursday night, then 7,000 ft. Friday.
• highs 67-50 lows 43-45 cooling to 43 Thursday 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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