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 25 in the Good category measuring Particulate Matter.

Oakridge: The Air Quality Index is 17 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 22 in the Good category measuring Particulate Matter.

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

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Advisories:

• A RED FLAG WARNING IS IN EFFECT FRON 1 PM UNTIL 8 PM THURSDAY FOTR THE ENTIRE WILLAMETTE VALLEY.
• A FIRE WEATHER WATCH IS IN EFFECT FROM MIDNIGHT THURSDAY NIGHT THROUGH LATE FRIDAY NIGHT FOR WIND AND LOW RELATIVE HUMIDITY FOR THE NORTH OREGON COAST RANGE, THE NORTH OREGON CASCADE FOOTHILLS, THE CENTRAL OREGON CASCADE FOOTHILLS, MT. HOOD NATIONAL FOREST, WEST OF CASCADE CREST, AND THE THE WILLAMETTE NATIONAL FOREST.
• 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.
• AN EXCESSIVE HEAT WATCH IS IN EFFECT FROM FRIDAY MORNING THROUGH FRIDAY EVENING FOR THE NORTH OREGON COAST, AND THE CENTRAL OREGON COAST.
• 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:

• Sunny and still warm this afternoon, clear tonight,
• Sunny and Very Hot Thursday, clear Thursday night,
• Sunny and even Hotter Friday, then clear at night.
• highs 89-102 lows 54-57.
• 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 56-50. (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:

• Sunny and a bit warmer today, clear tonight,
• Sunny and Very HOT Thursday and Friday, then clear Friday night.
• highs 90-106 lows 58-64.
• Sunny and slightly cooler Saturday (but still HOT), clear at night,
• Sunny and a bit cooler Sunday, Monday and Tuesday, clear each night.
• highs 103-87 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:

• Sunny this afternoon, partly cloudy this evening and mostly cloudy with patchy coastal fog late while mostly cloudy inland tonight,
• AM coastal fog and clouds, mostly sunny and a bit warmer Thursday afternoon, clear Thursday night,
• Patchy AM fog, sunny and hot Friday, then mostly clear with patchy coastal fog late Friday night.
• highs 63-80 lows 52-57 cooling to 54 Friday night .
• 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:

• Sunny and warmer today, Thursday and Friday, clear each night.
• free air freezing level 15,000 ft. today through Thursday, then 16,000 ft. Thursday night through Friday night.
• highs 79-86 lows 50-53 cooling back to 50 Friday night.
• Sunny and a bit cooler Saturday, Sunday, Monday and Tuesday, clear each night.
• free air freezing level 16,000 ft. Friday through Saturday, 16,000 ft. Saturday night, 15,000 ft. Sunday, then 14,000 ft. Sunday night through Tuesday.
• highs 85-75 lows 50-46.

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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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