Here is my new weekly weather quiz question for the last time. What is a “Swell?” Here is the correct answer. A Swell: Wind-generated waves that have travelled out of their generating area. Swells characteristically exhibit smoother, more regular and uniform crests and a longer period than wind waves. I’ll have a new weekly weather quiz question starting Monday. 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 pressure trough starts cooling us down as it moves in and eventually through the Pacific Northwest. By Friday another frontal system will move through Oregon.

 

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Air Quality Index:

Eugene-Springfield: The Air Quality Index is 34 in the Good  category measuring Ozone.

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

Cottage Grove: The Air Quality Index is 38 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 UNTIL 9 PM THIS EVENING FOR GUSTY WINDS AND LOW HUMIDITY FOR THE LOWER COLUMBIA BASIN OF OREGON, THE CENTRAL MOUNTAINS OF OREGON, THE EAST SLOPES OF THE CENTRAL OREGON CASCADES AND THE EAST SLOPES OF THE NORTHERN OREGON CASCADES.
• A Blue-Green Algae health advisory is in effect for Odell Lake in Lane County. Water testing has confirmed the presence of blue-green algae and the toxins they produce. 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.
• 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 this evening, partly cloudy late tonight,
• Cloudy Sunday AM, sunny and a bit cooler in the afternoon, clear in the evening, mostly cloudy late Sunday night and Monday AM, mostly sunny and a bit cooler in the afternoon, mostly clear in the evening, mostly cloudy late Monday night,
• Mostly cloudy Tuesday AM, partly cloudy and a bit cooler in the afternoon, then mostly clear Tuesday night.
• lows 52-55 highs 83-79.
• Mostly sunny and a bit warmer Wednesday and Thursday, clear Wednesday night, clear in the evening, partly cloudy late Thursday night,
• Then mostly sunny Friday and Saturday (a bit cooler), mostly clear Friday night.
• highs 83-85 cooling to 80 Saturday lows 55-53. (seasonal averages high 84 low 52)

 

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Eugene-Springfield Pollen Count:

Grass………. Moderate (5)

Trees………. Low (0)

Last Counted: 7/29/16

Data Courtesy of Oregon Allergy Associates.

The Grass and Tree Pollen season is officially over now.

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Forecast for Roseburg:

• Clear tonight,
• Mostly cloudy Sunday AM, sunny and a bit cooler in the afternoon, clear in the evening, mostly cloudy late Sunday night and Monday AM, partly cloudy and a bit cooler Monday afternoon, clear in the evening, partly cloudy late Monday night,
• Mostly cloudy Tuesday AM, sunny and a bit cooler in the afternoon, then clear Tuesday night.
• lows near 56 highs 86-83.
• Then mostly sunny Wednesday, Thursday, Friday and Saturday, mostly clear each night.
• highs 87-84 lows 57- 60 cooling back to 57 Friday night. (seasonal averages high 86 low 57)

 

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

• Clear at the shore this evening and mostly cloudy late tonight while clear inland tonight,
• Mostly cloudy Sunday at the shore while mostly cloudy inland in the AM and sunny Sunday afternoon inland, clear in the evening, mostly cloudy Sunday night and Monday, clear in the evening, mostly cloudy late Monday night,
• Mostly cloudy in the AM, partly cloudy and a bit cooler Tuesday afternoon, then mostly clear Tuesday night.
• lows 53-55 highs near 65.
• Partly cloudy Wednesday and Wednesday night,
• AM clouds, sunny Thursday, afternoon, clear in the evening, then partly cloudy late Thursday night through Saturday.
• highs near 66 lows near 56. (seasonal averages high 65 low 53)

 

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Forecast for the Cascades in Lane County:

• Clear tonight,
• Sunny and a bit cooler Sunday, mostly clear at night,
• Mostly sunny and a bit warmer Monday, mostly clear Monday night,
• A mix of clouds and sun Tuesday AM, mostly sunny but cooler in the afternoon, then mostly clear Tuesday night.
• free air freezing level 16,000 ft. tonight, 15,000 ft. Sunday through Monday,  14,000 ft. Monday night, 12,000 ft. Tuesday, then 14,000 ft. Tuesday night.
• lows 45-42 highs 72-75 cooling to 67 Tuesday.
• Mostly sunny and a bit warmer Wednesday, clear Wednesday night,
• Then sunny Thursday, Friday and Saturday, clear each night.
• free air freezing level 14,000 ft. Wednesday, 15,000 ft. Wednesday night through Thursday night, then 14,000 ft. Friday through Saturday.
• highs 75-77 cooling to 74 Friday and Saturday lows 46-48.

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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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