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) is taking over and will seriously warm us up late in the week into Saturday. It looks like a frontal system will be heading our way Thursday and Friday with very little or no effect on our weather. A warm front (line of red semicircles) pushes through between Friday and Saturday pushing up the temperatures. Upper level low pressure Starts to take over early next week and a cold front looks like it will move through the Pacific Northwest next Monday and that might just cool us down a bit.

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Air Quality Index:

Eugene-Springfield: The Air Quality Index is 43 in the Good category measuring Ozone.

Oakridge: The Air Quality Index is 15 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 44 in the Good category measuring Ozone.

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

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Advisories:

• AN EXCESSIVE HEAT WATCH IS IN EFFECT FROM THURSDAY AFTERNOON THROUGH SATURDAY EVENING FOR THE COAST RANGE OF NORTHWEST OREGON, THE CENTRAL COAST RANGE OF WESTERN OREGON, THE GREATER PORTLAND METRO AREA, THE CENTRAL WILLAMETTE VALLEY, THE SOUTH WILLAMETTE VALLEY, THE WESTERN COLUMBIA RIVER GORGE, THE CENTRAL COLUMBIA RIVER GORGE, THE NORTH OREGON CASCADE FOOTHILLS, THE CASCADES IN LANE COUNTY, AND THE UPPER HOOD RIVER VALLEY.
• A HEAT ADVISORY IS IN EFFECT FROM 11 AM THURSDAY UNTIL 2 AM SUNDAY FOR  CENTRAL DOUGLAS COUNTY, EASTERN CURRY COUNTY, JOSEPHINE COUNTY, THE EASTERN DOUGLAS COUNTY FOOTHILLS, 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,
• Partly cloudy to start, sunny and still warm Wednesday, clear at night,
• Sunny and Very Hot Thursday, clear Thursday night,
• Sunny and even Hotter Friday, then clear at night.
• lows 52-57 highs 88-102.
• Sunny and just slightly cooler but still hot Saturday, clear at night,
• Then sunny and a bit cooler Sunday, Monday and Tuesday, clear Sunday night and Monday night.
• highs 98-85 lows near 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 a bit warmer Wednesday, clear at night,
• Sunny and Very HOT Thursday and Friday, then clear Friday night.
• lows 58-64 highs 90-106.
• Sunny and slightly cooler Saturday (but still HOT), clear at night,
• Sunny and a bit cooler Sunday, Monday and Tuesday, clear each night.
• highs 101-87 lows 59-56. (seasonal averages high 85 low 56)

 

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

• Mostly cloudy with patchy coastal fog tonight while mostly clear inland late tonight,
• Mostly cloudy with patchy AM coastal fog and sunny Wednesday afternoon while sunny inland Wednesday, partly cloudy in the evening and mostly cloudy with patchy coastal fog while mostly cloudy inland,
• Mostly sunny and a bit warmer Thursday afternoon, clear Thursday night,
• Sunny and hot Friday, then mostly clear with patchy coastal fog late Friday night.
• lows 52-57 cooling to 54 Friday  night highs 63-80.
• Patchy AM fog, mostly sunny and much cooler Saturday, clear at night,
• Sunny and a bit cooler Sunday, partly cloudy Sunday night and Monday, mostly clear at night,
• Then sunny and a bit cooler Tuesday.
• highs 68-62 lows 54-52. (seasonal averages high 65 low 53)

 

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Forecast for the Cascades in Lane County:

• Clear tonight,
• Sunny and a bit warmer Wednesday, Thursday and Friday, clear each night.
• free air freezing level 15,000 ft. tonight through Thursday, then 16,000 ft. Thursday night through Friday night.
• lows 50-53 cooling back to 50 Friday night highs 79-86.
• Sunny and a bit cooler Saturday, Sunday, Monday and Tuesday, clear each night.
• free air freezing level 16,000 ft. Saturday and Saturday night, 15,000 ft. Sunday and Sunday night, then 14,000 ft. Monday through Tuesday.
• highs 85-76 lows 50-47.

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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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