Here is my weekly weather quiz question for the last time. What is a “Banner Cloud?” Here is the correct answer. A Banner Cloud is a cloud plume often observed to extend downwind behind isolated mountain peaks, even on otherwise cloud-free days. I’ll have a new weekly weather quiz question for you starting Monday. The first person to post the correct answer as a comment on this page will win a week of free personalized weather forecasts tailored to your needs.  Good luck.

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No change. The Upper Level Low Pressure Trough (Shaded “U” shape with blue arrows) is offshore while the Upper level High pressure ridge (Shaded “Arch” shape with blue arrows) is still over the Rockies keeping our temperatures fairly stable. The graphics for days 1-3 show a cold front passing through today and another one offshore by Tuesday. The graphics for days 3-7 show the frontal system that moves across the Pacific Northwest Wednesday and another on Thursday.

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Air Quality Index:

Eugene-Springfield: The Air Quality Index is 28 in the Good category measuring Ozone.

Oakridge: The Air Quality Index is 15 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 31 in the Good category measuring Ozone.

Data courtesy of Lane Regional Air Protection Agency (LRAPA)

 

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Advisories:

•  A Health Advisory continues for Lake Billy Chinook, located 12 miles west of Madras in Jefferson County. Water monitoring has has confirmed the presence of Blue-green Algae and the toxins they produce. These toxin concentrations ca be harmful to humans and animals. 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. Drinking water directly from these areas of Lake Billy Chinook at this time is especially dangerous. Oregon public health officials advise campers and other recreational visitors that toxins cannot be removed by boiling, filtering or treating water with camping-style filters.
• A Permanent Health Advisory remains 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.

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

• Partly cloudy this evening, mostly cloudy tonight,
• Cloudy with a slight (20%) chance of AM light rain or drizzle, a mix of clouds and sun and a bit cooler Monday afternoon, partly cloudy in the evening, clear late Monday night,
• Mostly sunny and a bit warmer Tuesday, mostly clear at night,
• Mostly sunny and a bit warmer Wednesday, then mostly clear Wednesday night.
• lows 55-50 warming to 52 Wednesday night highs 77-82.
• Mostly sunny and a bit warmer Thursday and Friday, mostly clear at night,
• Then sunny and a bit warmer Saturday and Sunday, clear Saturday night,
• highs 82-86 lows 52-54. (seasonal averages high 81 low 51)

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Eugene-Springfield Pollen Count

Grass………. High (28)

Trees………. Low (3)

Last Counted: 7/7/17

Data Courtesy of Oregon Allergy Associates.

 

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Forecast for Roseburg:

• Mostly clear this evening, partly cloudy late tonight,
• Mostly cloudy with patchy AM fog and drizzle, just partly cloudy and a bit cooler Monday afternoon, mostly clear at night,
• Then sunny and a bit warmer Tuesday and Wednesday, clear both nights.
• lows 58-53 warming to 56 Wednesday night highs 82-86.
• Sunny Thursday, Friday, and Saturday, clear to mostly clear each night,
• Then mostly sunny Sunday.
• highs 85-90 lows near 58. (seasonal averages high 83 low 56)

 

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

• Partly cloudy this evening, mostly cloudy with patchy fog and drizzle late tonight,
• Cloudy with patchy fog and drizzle Monday AM, partly cloudy and a bit cooler in the afternoon, partly cloudy with patchy fog late Monday night,
• Mostly cloudy with patchy AM fog Tuesday, sunny and a bit warmer in the afternoon, mostly cloudy with patchy coastal fog late at night,
• Partly cloudy with patchy AM and late night fog, just partly cloudy and a bit warmer Wednesday afternoon.
• lows near 55-52 warming back to 55 Wednesday night highs 62-64.
• Partly cloudy with patchy AM and late night fog Thursday through Saturday, then just partly cloudy Saturday night and Sunday.
• highs near 63 lows near 55. (seasonal averages high 64 low 53)

 

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Forecast for the Cascades in Lane County:

• Partly cloudy tonight,
• AM clouds with a slight (20%) chance of rain or drizzle and mostly sunny and a bit  cooler Monday afternoon while partly cloudy in the AM and mostly sunny in the afternoon near the crest, clear Monday night,
• Then sunny Tuesday and Wednesday, clear both nights.
• free air freezing level 15,000 ft. tonight, snow level above 8,000 ft. Monday, then free air freezing level 15,000 ft. Monday night through Wednesday night.
• lows 47-44 warming back to 47 Wednesday night highs 69-74.
• Mostly sunny and a little bit warmer Thursday, mostly clear Thursday night,
• Then sunny and a bit warmer Friday, Saturday, and Sunday, clear Friday night and Saturday night.
• free air freezing level 15,000 ft. Thursday through Friday, 15,000 ft. rising to 16,000 ft. Friday night, 16,000 ft. Saturday and Saturday night, then 16,000 ft. falling to 15,000 ft. Sunday.
• highs 78-82 cooling to 80 Sunday lows 49-53.

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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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