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 will seriously warm us up late in the week into Saturday. A backdoor frontal system (meaning it’s moving from the northeast to the southwest) holding down the temperature a bit today.  A warm front (line of red semicircles that was the cold front that backed in) pushes back eastward between Friday and Saturday pushing up the temperatures to at least near-record highs. 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 38 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 37 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 FROM 1 PM UNTIL 8 PM THURSDAY FOR THE ENTIRE WILLAMETTE VALLEY.
• A RED FLAG WARNING IS IN EFFECT FROM MIDNIGHT THURSDAY NIGHT UNTIL 8 PM SATURDAY FOR WIND, LOW RELATIVE HUMIDITY AND INCREASINGLY UNSTABLE CONDITIONS FOR NORTH OREGON COAST, THE NORTH OREGON COASTAL STRIP, THE FEDERAL AND STATE PROTECTED LANDS IN IN THE COAST RANGE AND THE CASCADES.
• AN EXCESSIVE HEAT WARNING IS IN EFFECT FROM 2 PM THURSDAY THROUGH 9 PM SATURDAY FROM THE OREGON COAST RANGE TO THE TO THE CASCADE FOOTHILLS INCLUDING THE GREATER PORTLAND METRO AREA, THE CENTRAL WILLAMETTE VALLEY, THE SOUTH WILLAMETTE VALLEY,  THE NORTH OREGON CASCADE FOOTHILLS AND THE CASCADES IN LANE COUNTY.
• A HEAT ADVISORY IS IN EFFECT FROM NOON UNTIL 9 PM FRIDAY FOR THE NORTH OREGON COAST , THE CENTRAL OREGON COAST,  THE WESTERN COLUMBIA RIVER GORGE,  THE CENTRAL COLUMBIA RIVER GORGE 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,
• Sunny and Very Hot Thursday, Friday and Saturday, clear each night,
• lows 52-59 cooling to 57 Saturday night highs 99-103 cooling to 101 Saturday.
• Sunny and a bit cooler Sunday, Monday and Tuesday, clear each night,
• Then sunny and a bit warmer Wednesday.
• highs 91-82 warming to 85 Wednesday lows 53-50 warming to 53 Tuesday night. (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 Thursday, Friday, and Saturday, clear each night,
• lows 57-65 cooling to 59 Saturday night highs 102-108 cooling to 102 Saturday.
• Sunny and a bit cooler Sunday, Monday and Tuesday, clear each night.
• highs 94-86 lows near 56. (seasonal averages high 85 low 56)

 

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

• Mostly clear this evening, partly cloudy  late tonight with patchy coastal fog,
• Patchy AM coastal fog and clouds and mostly sunny and a bit warmer Thursday afternoon while sunny inland, mostly clear Thursday night,
• Patchy AM fog, sunny and very warm Friday, mostly cloudy with patchy coastal fog late Friday night while mostly clear inland,
• Patchy AM fog, sunny and much cooler Saturday, then partly cloudy at night.
• lows 52-57 cooling to 54 Thursday night and Friday night highs 70-82 cooling to 68 Saturday.
• Partly cloudy and a bit cooler Sunday, and Sunday night,
• Mostly cloudy Monday AM, sunny in the afternoon and Tuesday, mostly clear both nights,
• Then mostly sunny and a bit warmer Wednesday.
• highs 63-60 warming to 65 Wednesday lows 54-52. (seasonal averages high 65 low 53)

 

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Forecast for the Cascades in Lane County:

• Clear tonight,
• Sunny and warmer Thursday, Friday and Saturday, clear each night,
• free air freezing level 15,000 ft. Thursday, 16,000 ft. Thursday night through Saturday, then 15,000 ft. Saturday night.
• lows near 52 highs 86-88.
• Sunny and a bit cooler Sunday, Monday, Tuesday and Wednesday, clear each night.
• free air freezing level 15,000 ft. Sunday, 14,000 ft. Sunday night, 13,000 ft. Monday and Monday night, 12,000 ft. Tuesday, and Tuesday night, then 14,000 ft. Wednesday.
• highs 82-75 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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