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 that will pass through early Monday. The graphics for days 3-7 show the frontal systems that move through Oregon Wednesday through next Saturday.

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Air Quality Index:

Eugene-Springfield: The Air Quality Index is 31 in the Good category measuring Ozone.

Oakridge: The Air Quality Index is 23 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 3 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:

• Clear tonight,
• Mostly sunny and a bit cooler Sunday, partly cloudy in the evening, mostly cloudy at night,
• AM clouds with a slight (20%) chance of light rain or drizzle, partly cloudy and a bit cooler Monday afternoon and at night,
• Mostly sunny and a bit warmer Tuesday, mostly clear Tuesday night.
• lows 52-55 cooling to 50 Monday night highs 84-78 warming back to 82 Tuesday.
• Mostly sunny and a bit warmer Wednesday, mostly clear at night,
• Then sunny Thursday, Friday, and Saturday, clear each night,
• highs 83-85 lows near 53. (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 tonight,
• AM clouds with patchy fog, sunny and a bit cooler Sunday afternoon, mostly clear in the evening, partly cloudy late at night,
• Mostly cloudy with patchy AM fog and drizzle, just mostly cloudy and a bit cooler Monday afternoon, then partly cloudy Monday night,
• Partly cloudy and a bit warmer Tuesday, then mostly clear at night.
• lows 55-58 cooling to 52 Monday night warming back to 55 Tuesday night highs near 86-80 warming back to 86 Tuesday .
• Mostly sunny Wednesday, Thursday, and Friday, and Saturday, mostly clear each night,
• highs 85-87 lows near 56. (seasonal averages high 83 low 56)

 

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

• Mostly clear this evening, mostly cloudy with patchy fog late tonight,
• AM clouds with patchy fog, sunny Sunday afternoon, mostly clear in the evening, mostly cloudy with patchy fog and drizzle late at night,
• 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,
• Partly cloudy with patchy AM Tuesday, partly cloudy in the afternoon, patchy fog late at night.
• lows near 53 highs 64-62.
• Partly cloudy with patchy AM and late night fog Wednesday through Saturday,
• highs near 63 lows near 54. (seasonal averages high 64 low 53)

 

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Forecast for the Cascades in Lane County:

• Clear tonight,
• Sunny and a bit cooler Sunday, partly cloudy Sunday night,
• AM clouds, mostly sunny and a bit  cooler Monday afternoon, mostly clear at night,
• Mostly sunny and a bit warmer Tuesday, mostly clear Tuesday night.
• free air freezing level 16,000 ft. falling to 15,000 ft. tonight, 15,000 ft. Sunday, 15,000 ft. falling to 14,000 ft. Sunday night, 14,000 ft. Monday, then 15,000 ft. Monday night through Tuesday night.
• lows near 47 highs 73-70 warming to 74 Tuesday.
• Mostly sunny and a little bit cooler Wednesday and Thursday, clear Wednesday night, mostly clear Thursday night,
• Then sunny Friday and Saturday, clear Saturday night.
• free air freezing level 15,000 ft. Wednesday night through Friday night, then 15,000 ft. rising to 16,000 ft. Saturday.
• highs near 77 lows 47-49.

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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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