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)continues to bring westerly airflow our way. That means a continuation of  the Pacific Ocean moisture feed to the Pacific Northwest. Short-lived High Pressure drys us out midweek, but you can see on days 3 through 7 frontal activity returns by Friday.

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Air Quality Index:

Eugene-Springfield: The Air Quality Index is 13 in the Good category measuring Particulate Matter.

Oakridge: The Air Quality Index is 20 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 7 in the Good category measuringParticulate Matter.

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

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Advisories:

• A WINTER WEATHER ADVISORY IS IN EFFECT UNTIL 8 PM MONDAY FOR THE SOUTH CENTRAL OREGON CASCADES, THE SOUTHERN OREGON CASCADES, AND THE SISKIYOU MOUNTAINS.
• A WIND ADVISORY IS IN EFFECT UNTIL 11 PM TONIGHT FOR NORTHERN AND EASTERN KLAMATH COUNTY, AND WESTERN, CENTRAL AND EASTERN LAKE COUNTY.
• A FLOOD WATCH IS IN EFFECT THROUGH LATE TONIGHT FOR THE CURRY COUNTY COAST.
• 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 likely (70%) tonight (0.25 in. of rain possible),
• AM showers likely (70%), showers  likely (70%) and a bit warmer Monday afternoon with a slight (20%) chance of thunderstorms (0.25 in. of rain possible, more in storms), showers likely (70%) Monday night (0.25 in. of rain possible),
• Mostly cloudy with a good (50%) chance of showers and a bit warmer Tuesday (0.10 in. of rain possible), just mostly cloudy at night,
• A mix of clouds and sun with a slight (20%) chance of showers and a bit warmer Wednesday, then mostly cloudy with a slight (20%) chance of showers Wednesday night.
• lows near 50 highs 58-62.
• A mix of clouds and sun and a bit warmer with a slight (20%) chance of showers Thursday, then partly cloudy with a (30%) chance of showers at night,
• A mix of clouds and sun and a bit cooler with a slight (20%) chance of showers Friday, mostly cloudy with a slight (20%) chance of showers Friday night,
• Then a mix of clouds and sun and a bit cooler Saturday and Sunday, partly cloudy Saturday night.
• highs 66-60 lows near 50. (seasonal averages high 64 low 41)

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Your College Football Forecast:

Friday October 21st – Preliminary Forecasts:

Ducks vs California at California Memorial Stadium, Berkeley, CA – Kickoff 7:30 PM – Mostly clear 73 and cooling as the game progresses, Wind N 5 mph.

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Saturday October 22nd:

Beavers vs Washington at  Husky Stadium, Seattle, WA – Kickoff 3:30 PM – Partly cloudy 57 and cooling as the game progresses, Wind Light.

 

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Forecast for Roseburg:

• Mostly cloudy with showers and a slight (20%) chance of thunderstorms this evening (gusty winds possible), showers late tonight (0.25 in. of rain possible),
• Mostly cloudy with AM showers, showers likely (70%) with a slight (20%) chance of thunderstorms Monday afternoon (0.25 in. of rain possible, more in storms), showers in the evening, showers likely (70%) late Monday night (0.25 in. of rain possible),
• Cloudy with showers likely (70%) in the AM, a good (50%) chance of showers Tuesday afternoon (under 0.10 in. of rain possible), just mostly cloudy at night,
• Mostly cloudy with a slight (20%) chance of showers and a bit warmer Wednesday and Wednesday night.
• lows near 50 highs 60-64.
• Partly cloudy and a bit warmer Thursday, mostly cloudy with a slight (20%) chance of showers Thursday night and Friday, then just mostly cloudy Friday night through Sunday,
• highs 69-63 lows 52-48. (seasonal averages high 66 low 44)

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

• Mostly cloudy with coastal showers and a slight (20%) chance of thunderstorms tonight while inland showers with a slight (20%) chance of thunderstorms this evening and inland showers late tonight (0.50 in. of rain possible),
• Coastal showers with a slight (20%) chance of thunderstorms Monday while AM inland showers likely (70%) with showers and a slight (20%) chance of thunderstorms inland in the afternoon (0.25 in. of rain possible), coastal showers with a slight (20%) chance of thunderstorms Monday night while inland evening showers and showers and with a slight (20%) chance of thunderstorms inland at night (0.50 in. of rain possible),
• Mostly cloudy with AM showers likely (70%), a good (50%) chance of showers Tuesday afternoon (0.10 in. of rain possible), just mostly cloudy Tuesday night,
• Mostly cloudy with a (30%) chance of showers and a bit warmer Wednesday, then mostly cloudy with a slight (20%) chance of showers Wednesday night.
• lows 50-52 highs 59-63.
• Mostly cloudy and a bit warmer with a slight (20%) chance of showers Thursday through Friday, then just mostly cloudy Friday night through Sunday.
• highs 64-62 lows 52-50. (seasonal averages high 61 low 46)

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Forecast for the Cascades in Lane County:

• Mostly cloudy with rain and snow showers tonight (0.50 in. of rain possible, 1-3 in. of snow possible),
• Rain and snow likely (70%) and a bit cooler Monday (0.25 in. of rain possible), rain and snow showers in the evening, showers likely (70%) late at night (0.50 in. of rain possible, 1-3 in. of snow possible),
• Cloudy with AM rain and snow showers likely (70%), a good (50%) chance of rain and snow showers Tuesday afternoon, just mostly cloudy at night,
• A mix of clouds and sun and a bit warmer Wednesday, mostly cloudy with a slight (20%) chance of showers Wednesday night.
• snow level 5,500 ft. tonight and Monday, 6,000 ft. Monday night, 5,500 ft. Tuesday, free air freezing level 5,500 ft. Tuesday night, 9,000 ft. Wednesday, then snow level above 8,000 ft. Wednesday night.
• lows 37-35 warming to 40 Wednesday night highs 44-53.
• A mix of clouds and sun and a bit warmer Thursday, partly cloudy with a (30%) chance of showers Thursday night,
• A mix of clouds and sun and a bit warmer with a slight (20%) chance of showers Friday, just partly cloudy at night,
• A mix of clouds and sun and a bit cooler Saturday, then just partly cloudy Saturday night and Sunday.
• free air freezing level 12,000 ft. Thursday, snow level above 8,000 ft. Thursday night and Friday, free air freezing level 10,000 ft. Friday night, then 9,000 ft. Saturday through Sunday.
• highs 57-53 lows near 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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