Here is my weekly weather quiz question. What is a “Theodolite?” 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 (Shaded “Arch” Shape with blue arrows) has taken over and is seriously warming us up for the rest of the week into Saturday.  Look for record high temperatures particularly in Eugene and Roseburg. Upper level low pressure (Shaded “U” shape with blue arrows) starts to take over early next week and a cold front will move through the Pacific Northwest next Monday and that should cool us down a bit, but not for very long as high pressure takes over again by midweek.

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Air Quality Index:

Eugene-Springfield: The Air Quality Index is 80 in the Moderate category measuring Ozone.

Oakridge: The Air Quality Index is 45 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 80 in the Moderate  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 8 PM THIS EVENING FOR THE ENTIRE WILLAMETTE VALLEY.
• A RED FLAG WARNING IS IN EFFECT FROM LATE TONIGHT THROUGH SATURDAY EVENING FOR WIND, LOW RELATIVE HUMIDITY AND INCREASINGLY UNSTABLE CONDITIONS FOR NORTH OREGON COAST RANGE, THE EAST SLOPES OF OF THE OF THE CENTRAL OREGON COAST RANGE, THE NORTH OREGON CASCADE FOOTHILLS, THE CENTRAL OREGON CASCADE FOOTHILLS, THE MT. HOOD NATIONAL FOREST, WEST OF CASCADE CREST AND THE WILLAMETTE NATIONAL FOREST.
• AN EXCESSIVE HEAT WARNING IS IN EFFECT  THROUGH 9 PM SATURDAY FOR THE COAST RANGE OF NORTHWEST OREGON, THE CENTRAL COAST RANCE OF WESTERN OREGON, THE GREATER PORTLAND METRO AREA, THE CENTRAL WILLAMETTE VALLEY, THE SOUTH WILLAMETTE VALLEY,  THE WESTERN COLUMBIA RIVER GORGE, THE NORTH OREGON CASCADE FOOTHILLS, THE CASCADE FOOTHILLS IN LANE COUNTY, AND THE CASCADES IN LANE COUNTY BELOW 3,000 FT.
• A HEAT ADVISORY IS IN EFFECT FROM NOON UNTIL 9 PM FRIDAY FOR THE NORTH OREGON COAST , THE CENTRAL OREGON COAST,  THE CENTRAL COLUMBIA RIVER GORGE AND THE UPPER HOOD RIVER VALLEY.
• A HEAT ADVISORY IS IN EFFECT UNTIL 2 AM SUNDAY FOR  CENTRAL DOUGLAS COUNTY, EASTERN CURRY COUNTY, JOSEPHINE COUNTY, THE EASTERN DOUGLAS COUNTY FOOTHILLS, AND JACKSON  COUNTY.
• 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 Very Hot Friday and Saturday, clear Friday night, clear in the evening and partly cloudy late Saturday night,
• Sunny and cooler but still warm Sunday, then clear Sunday night.
• lows 58-53 highs 103-88.
• Mostly sunny and a bit cooler Monday, clear at night,
• Sunny and a bit cooler Tuesday, clear Tuesday night,
• Mostly sunny and a bit warmer Wednesday, clear at night,
• Then sunny and a bit warmer Thursday.
• highs 83-80 warming to 89 Thursday lows 50-55. (seasonal averages high 83 low 51)

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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 Very HOT Friday and Saturday, clear both nights,
• Sunny and a little bit cooler Sunday, then mostly clear Sunday night,
• lows 66-56 highs 108-95.
• Mostly sunny and a bit cooler Monday, then mostly clear at night.
• Sunny Tuesday, clear Tuesday night,
• Mostly sunny Wednesday, mostly clear at night,
• Then sunny Thursday.
• highs near 88 lows near 55. (seasonal averages high 85 low 55)

 

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

• Mostly clear tonight,
• Sunny and very warm Friday with patchy afternoon coastal fog, mostly cloudy with patchy coastal fog Friday night while mostly clear inland at night,
• Mostly cloudy with patchy coastal AM fog while sunny and much cooler inland Saturday, partly cloudy in the evening at the shore and mostly cloudy late while mostly clear inland Saturday night,
• Partly cloudy in the AM, sunny and a bit cooler Sunday, then mostly cloudy Sunday night.
• lows near 53 highs 76-65.
• Mostly cloudy and a bit cooler Monday and Monday night,
• AM clouds, sunny and a bit cooler Tuesday afternoon, mostly clear at night,
• Then mostly sunny and a bit warmer Wednesday and Thursday, mostly clear Wednesday night.
• highs 64-66 lows near 52. (seasonal averages high 66 low 53)

 

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Forecast for the Cascades in Lane County:

• Clear tonight,
• Sunny and warmer (Hot) Friday and Saturday, clear both nights,
• Sunny and a bit cooler Sunday, then clear at night.
• free air freezing level 16,000 ft. tonight through Saturday, 15,000 ft. Saturday night through Sunday, then 14,000 ft. Sunday night.
• lows 57-46 highs 86-88 cooling to near 80 Sunday.
• Sunny and a bit cooler Monday and Tuesday, clear at night,
• Then sunny and a bit warmer Wednesday and Thursday, clear both nights.
• free air freezing level 13,000 ft. Monday through Tuesday, 14,000 ft. Tuesday night and Wednesday, then 15,000 ft. Wednesday night and Thursday.
• highs 74-72 warming to 77 Thursday lows 49-47.

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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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