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 46 in the Good category measuring Ozone.

Oakridge: The Air Quality Index is 14 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 49 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 FROM NOON FRIDAY 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 HEAT ADVISORY IS IN EFFECT FROM 2 PM FRIDAY UNTIL 7 PM SATURDAY FOR EASTERN CURRY COUNTY, JOSEPHINE COUNTY AND JACKSON COUNTY.
• A Blue-Green Algae health advisory remains 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 tonight,
• Sunny and hot Friday and Saturday, clear Friday night, partly cloudy Saturday night,
• Sunny and a bit cooler Saturday, mostly clear Saturday night,
• A mix of clouds and sun Sunday AM, mostly sunny and a bit cooler in the afternoon, mostly clear in the evening, then mostly cloudy late Sunday night.
• lows 55-57 cooling back to 55 Sunday night highs 97-87.
• Mostly cloudy Monday AM, mostly and a bit cooler sunny Monday afternoon, mostly clear at night,
• Sunny and a bit warmer Tuesday, Wednesday and Thursday, mostly clear each night,
• highs 86-92 lows near 55. (seasonal averages high 84 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 a bit warmer Friday and Saturday, clear each night,
• Sunny but cooler Sunday, then mostly clear at night.
• lows 60-62 cooling to 57 highs 99-100 cooling to 89 Sunday.
• Sunny and a bit warmer Monday, Tuesday, Wednesday and Thursday, clear each night,
• highs 86-94 lows 57-60. (seasonal averages high 86 low 56)

 

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

• Clear this evening at the shore and mostly cloudy late tonight while clear inland tonight,
• Mostly cloudy at the shore Friday AM and partly cloudy in the afternoon while sunny inland Friday, mostly clear at the shore in the evening and mostly cloudy with patchy coastal fog late at night while clear inland Friday night,
• Mostly cloudy with patchy AM coastal fog and sunny and a bit cooler Saturday afternoon while sunny Saturday afternoon inland, clear in the evening and cloudy with areas of fog and patchy coastal drizzle while partly cloudy inland late Saturday night,
• Cloudy with areas of AM patchy drizzle and areas of fog Sunday, sunny in the afternoon, partly cloudy in the evening, then cloudy late Sunday night.
• lows near 55 highs 68-66.
• Partly cloudy Monday through Wednesday, mostly clear at night,
• Then mostly sunny and a bit warmer Thursday.
• highs 66-68 lows 54-56. (seasonal averages high 65 low 53)

 

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Forecast for the Cascades in Lane County:

• Clear tonight,
• Sunny and a bit warmer  Friday and Saturday, clear each night,
• Mostly sunny and a bit cooler with a slight (20%) chance of showers and isolated thunderstorms Sunday, then mostly clear Sunday night.
• free air freezing level 14,000 ft. tonight, 15,000 ft. Friday through Saturday night, 14,000 ft. Sunday, then 15,000 ft. Sunday night..
• lows 49-53 cooling to 47 Sunday  night highs 85-77.
• Then sunny and a bit warmer Monday, Tuesday, Wednesday and Thursday (a bit cooler), clear each night,
• free air freezing level 15,000 ft. Monday through Thursday.
• highs 79-82 cooling to 80 Thursday 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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