Here is my weekly weather quiz question. What is a “Thalweg?” 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 high pressure ridge (“Arch” shape in blue arrows) is bringing us sunshine and much warmer temperatures. A frontal system will be pushing through Oregon Sunday to cool us down a bit . It looks like another frontal system will be heading our way next Tuesday with very little or no effect on our weather. You may just want to check out this year’s Perseid Meteor Shower which peaks through Sunday. It is predicted that you could see up to 200 “shooting stars” per hour from debris from the comet Swift-Tuttle. Best viewing is late at night to before sunrise. Make sure you are out far enough away from the city lights so the sky looks darker and the meteorites will be more easily seen.

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Air Quality Index:

Eugene-Springfield: The Air Quality Index is 48 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 32 in the Good category measuring Ozone.

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

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Advisories:

• A HEAT ADVISORY IS IN EFECT UNTIL 6 PM SATURDAY FOR THE GREATER PORTLAND METRO AREA, THE CENTRAL WILLAMETTE VALLEY, THE SOUTH WILLAMETTE VALLEY, THE WESTERN COLUMBIA RIVER GORGE AND THE CENTRAL COLUMBIA RIVER GORGE.
• A RED FLAG WARNING FOR STRONG WINDS AND LOW RELATIVE HUMIDITY IS IN EFFECT FROM 3  PM UNTIL 8 PM SATURDAY FOR THE WESTERN ROGUE BASIN INCLUDING THE ILLINOIS VALLEY AND THE EASTERN ROGUE VALLEY.
• A HEAT ADVISORY IS IN EFFECT UNTIL 7 PM SATURDAY FOR EASTERN CURRY COUNTY, JOSEPHINE COUNTY AND JACKSON COUNTY.
• A Blue-Green Algae health advisory in effect for Odell Lake in Lane County has been lifted. 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 tonight,
• Sunny and hot Saturday, clear in the evening, partly cloudy late Saturday night,
• Mostly sunny and a bit cooler Sunday, mostly clear in the evening, mostly cloudy late Sunday night and Monday AM, mostly sunny and a bit cooler  Monday afternoon, then clear at night.
• lows 57-55 highs 95-86.
• Then sunny and a bit warmer Tuesday, Wednesday, Thursday and Friday, clear each night,
• highs 88-93 lows near 55. (seasonal averages high 83 low 52)

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Eugene-Springfield Pollen Count:

Grass………. Low (3)

Trees………. Low (0)

Last Counted: 8/11/16

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, sunny and hot Saturday, clear in the evening, partly cloudy at night and Sunday AM, sunny but a bit cooler in the afternoon, clear Sunday night,
• Partly cloudy in the AM, sunny Monday afternoon, then clear at night.
• lows 62-58 highs 100-92.
• Sunny Tuesday, Wednesday, Thursday and Friday, clear each night.
• highs 92-94 lows 58-56. (seasonal averages high 85 low 56)

 

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

• Clear this evening, mostly cloudy late tonight with patchy coastal fog late,
• Mostly cloudy with patchy AM coastal fog, sunny Saturday afternoon, partly cloudy in the evening, cloudy late Saturday night with areas of fog and patchy coastal drizzle late at night,
• Cloudy with AM patchy drizzle and areas of fog Sunday, sunny in the afternoon, partly cloudy in the evening, mostly cloudy patchy coastal drizzle and areas of fog late Sunday night,
• Then mostly cloudy Monday and Monday night.
• lows near 55 highs near 66.
• Partly cloudy Tuesday through Wednesday, clear in the evening, then partly cloudy late Wednesday night through Friday.
• highs near 66 lows near 54. (seasonal averages high 65 low 53)

 

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Forecast for the Cascades in Lane County:

• Clear tonight,
• Sunny and a bit warmer Saturday, clear at night,
• Mostly sunny and a bit cooler Sunday, partly cloudy in the evening, mostly clear late Sunday night,
• Mostly sunny and a bit cooler Monday, then clear at night.
• free air freezing level 15,000 ft. tonight through Monday night.
• lows 52-47 warming to 50 Monday night highs 85-77.
• Then sunny and a bit warmer Tuesday, Wednesday, Thursday and Friday, clear each night,
• free air freezing level 15,000 ft. Tuesday through Wednesday, then 16,000 ft. Wednesday night through Friday.
• highs 82-80 warming to 82 Thursday and Friday lows 49-52.

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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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