Here is my weekly weather quiz question for the last time. What is an “Accessory Cloud?” Here is the correct answer. An Accessory Cloud is a cloud which is dependent on a larger cloud system for development and continuance. Roll clouds, shelf clouds, and wall clouds are examples of accessory clouds. I’ll have a new weekly weather quiz question for you starting Monday. Please remember to post your answer at the bottom of this page. An email will not suffice. 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 Pressure Trough (Shaded “U” shape with blue arrows) has taken over bringing a series of frontal systems. Check out the frontal movement on the Days 1,2 & 3 graphic showing our storm (containing the remnants of Typhoon Songa) marching northward along the coast and sending a frontal system through the Pacific Northwest. You’ll see days 3 through 7 show a frontal system offshore Wednesday and a frontal system moving through by Friday.

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Air Quality Index:

Eugene-Springfield: The Air Quality Index is 8 in the Good category measuring Particulate Matter.

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

Cottage Grove: The Air Quality Index is 8 in the Good category measuringParticulate Matter.

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

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Advisories:

• A WIND ADVISORY IS IN EFFECT FROM 2 PM THIS AFTERNOON UNTIL 11 PM TONIGHT FOR NORTHERN AND EASTERN KLAMATH COUNTY AND WESTERN LAKE COUNTY.
• A WIND ADVISORY IS IN EFFECT UNTIL 11 PM TONIGHT CENTRAL AND EASTERN LAKE COUNTY.
• A Blue-green Algae Health Advisory has been issued for Howard Bay located in Upper Klamath Lake. 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. Cell counts in other parts of the lake were low.
• A Permanent Health Advisory is in effect for the South Umpqua River and Lawson Bar. Pools in the bedrock along the rivers edge are known to develop Blue-green Algae (cyanobacterial) blooms that can be harmful to pets and people if accidental ingestion occurs. Signs have been posted along several access areas along the river.
• A Blue-Green Algae 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.

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

• Mostly cloudy with showers today (0.25 in. of rain possible) and breezy (Wind: S 15-25 mph), showers likely (70%) tonight (0.25 in. of rain possible),
• Cloudy with a (30%) chance of AM showers, rain likely (70%) and a bit warmer Monday afternoon (0.25 in. of rain possible), a good (50%) chance of showers Monday night (0.25 in. of rain possible),
• Cloudy with a good (50%) chance of showers Tuesday AM, showers likely (70%) and a bit warmer in the afternoon, then mostly cloudy with a slight (20%) chance of showers Tuesday night.
• highs 57-60 lows 52-50.
• Mostly cloudy with a slight (20%) chance of showers and a bit warmer Wednesday and Wednesday night,
• A mix of clouds and sun and a bit warmer with a slight (20%) chance of showers Thursday, partly cloudy with a (40%) chance of showers at night,
• A mix of clouds and sun and a bit cooler with a (40%) chance of showers Friday, mostly cloudy with a slight (20%) chance of showers Friday night,
• Then a mix of clouds and sun with a slight (20%) chance of showers and a bit cooler Saturday.
• highs 63-66 cooling to 62 Saturday lows near 50. (seasonal averages high 64 low 41)

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Your College Football Forecast:

Friday October 21st:

Ducks vs California at California Memorial Stadium, Berkeley, CA – Kickoff 7:30 PM – Too soon for an accurate weather forecast.

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Saturday October 22nd:

Beavers vs Washington at  Husky Stadium, Seattle, WA – Kickoff 3:30 PM – Too soon for an accurate weather forecast.

 

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Forecast for Roseburg:

• Mostly cloudy with showers and a bit cooler today (0.75 in. of rain possible), showers with a slight (20%) chance of evening thunderstorms (gusty winds possible in storms), showers late tonight (0.25 in. of rain possible),
• Mostly cloudy with AM showers likely (70%), showers Monday afternoon (0.25 in. of rain possible), showers likely (70%) at night (0.25 in. of rain possible),
• Cloudy with a (40%) chance of showers Tuesday, then mostly cloudy with a slight (20%) chance of showers Tuesday night.
• highs 60-62 lows 50-47.
• Mostly cloudy with a slight (20%) chance of showers and a bit warmer Wednesday and at night,
• Partly cloudy and a bit warmer with a slight (20%) chance of showers Thursday, mostly cloudy with a slight (20%) chance of showers Thursday night,
• Just mostly cloudy and a bit warmer Friday, then mostly cloudy with a slight (20%) chance of showers Friday night and Saturday.
• highs 66-70 lows 48-50. (seasonal averages high 66 low 45)

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

• Mostly cloudy with coastal showers (1.00 in. of rain possible) and a slight (20%) chance of thunderstorms today while showers inland, showers with a slight (20%) chance of thunderstorms in the evening, showers late tonight (0.75 in. of rain possible),
• Showers Monday (0.50 in. of rain possible), showers likely (70%) Monday night (0.50 in. of rain possible),
• Cloudy with a good (50%) chance of showers Tuesday, then mostly cloudy with a slight (20%) chance of showers Tuesday night.
• highs 60-62 lows 52-49.
• Cloudy with a slight (20%) chance of showers and a bit warmer Wednesday, mostly cloudy with a slight (20%) chance of showers Wednesday night through Thursday night,
• Just mostly cloudy Friday, then mostly cloudy with a slight (20%) chance of showers Friday night and Saturday.
• highs near 64 lows 50-52. (seasonal averages high 61 low 46)

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Forecast for the Cascades in Lane County:

• Mostly cloudy with showers (0.50 in. of rain possible) and a bit cooler today and breezy Wind: S 15-25 mph gusts to 40 mph) and tonight (0.50 in. of rain possible),
• AM rain and snow showers likely (70%), rain and snow likely (70%) and a bit cooler Monday ,afternoon, showers likely (70%) at night,
• Mostly cloudy and a bit warmer Tuesday with rain and snow showers likely (70%), then just a slight (20%) chance of showers Tuesday night.
• snow level 6,500 ft. today, 6,000 ft. tonight through Monday night, 5,500 ft. Tuesday, then above 8,000 ft. Tuesday night.
• highs 44-46 lows 38-35.
• Mostly cloudy with a slight (20%) chance of showers and a bit warmer Wednesday and at night,
• A mix of clouds and sun and a bit warmer with a slight (20%) chance of showers Thursday, partly cloudy with a (40%) chance of showers Thursday night,
• A mix of clouds and sun and a bit warmer with a (40%) chance of showers Friday, mostly cloudy with a (40%) chance of showers at night,
• Then a mix of clouds and sun and a bit cooler with a slight (20%) chance of showers Saturday.
• snow level 7,500 ft.Wednesday, then above 8,000 ft. Wednesday night through Saturday.
• highs 54-60 cooling to 55 Saturday lows 40-42.
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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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