Here is my weekly weather quiz question for the last time. What is a “Theodolite?” Here is the correct answer. A Theodolite is an instrument used in surveying to measure horizontal and vertical angles with a small telescope that can move in the horizontal and vertical planes. It used to track the movements of either a ceiling balloon or a radiosonde. I’ll have a new weekly weather quiz question for you starting Monday. 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 low (Shaded “U” shape with blue arrows) has taken over returning westerly airflow which is cooling us off. Don’t expect the cooler weather to last because upper level high pressure (“Arch” shape in blue arrows) will take over by midweek warming us back up.

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Air Quality Index:

Eugene-Springfield: The Air Quality Index is 24 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 20 in the Good category measuring Ozone.

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

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Advisories:

• A RED FLAG WARNING FOR GUSTY WINDS AND LOW RELATIVE HUMIDITY IS IN EFFECT UNTIL 11 PM TONIGHT FOR THE CENTRAL MOUNTAINS OF OREGON, THE EAST SLOPES OF THE NORTHERN OREGON CASCADES AND AND THE LOWER COLUMBIA BASIN OF OREGON.
• A RED FLAG WARNING IS IN EFFECT UNTIL 9 PM TODAY FOR STRONG WINDS AND LOW RELATIVE HUMIDITY AND HIGH FIRE DANGER FOR THE KLAMATH BASIN, THE FREMONT-WINEMA NATIONAL FOREST AND THE SOUTH CENTRAL OREGON DESERT INCLUDING THE BLM LAND IN EASTERN LAKE COUNTY AND WESTERN HARNEY COUNTY.
• A health advisory has been issued for the Ross Island Lagoon and the mouth of the lagoon as it connects to the Holgate Channel. Ross Island Lagoon is located about one river mile south of downtown Portland in Multnomah County. The advisory is being issued due to visual confirmation of a blue-green algae bloom in the lagoon. Oregon Public Health officials advise people to avoid swallowing or inhaling water droplets as a result of swimming or high-speed water activities, such as water skiing and power boating in areas where blooms are identified.
• A health advisory has been issued for Agency Lake. Agency Lake is located just north of Upper Klamath Lake near Klamath Falls along Highway 97 in Klamath County. Water monitoring on the lake has confirmed the presence of high levels of blue-green algae and associated toxins that can be harmful to people and animals. Swallowing water while swimming or inhaling water droplets as a result of high-speed water activities, such as water skiing and power boating, should be avoided in areas where blooms are identified. Although toxins are not absorbed through the skin, contact with cells from a bloom can cause skin irritation and a red, puffy rash in individuals with skin sensitivities, or those who develop rashes easily.
• 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:

• Mostly clear tonight,
• Mostly sunny and a bit cooler Monday, clear Monday night,
• Sunny and just a bit warmer Tuesday, clear at night,
• Sunny and a bit warmer Wednesday, then clear Wednesday night.
• lows 52-49 warming to 54 Wednesday night highs 83-92.
• Sunny and warmer Thursday and Friday, clear both nights,
  Then mostly sunny Saturday and Sunday, partly cloudy cloudy Saturday night.
• highs 98-82 lows 56-53. (seasonal averages high 82 low 51)

 

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Forecast for Roseburg:

• Clear tonight,
• Then sunny and a bit warmer Monday through Wednesday, clear each night,
• lows 57-52 warming to 54 Wednesday night highs 86-92.
• Then sunny and a bit warmer Thursday through Sunday, clear each night.
• highs 97-84 warming to 88 Sunday lows 57-55. (seasonal averages high 84 low 55)

 

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

• Clear this evening, mostly cloudy late tonight and Monday AM, sunny and a bit warmer in the afternoon, clear in the evening, mostly cloudy late Monday night,
• AM clouds, sunny and a bit cooler Tuesday afternoon, clear at night,
• Then sunny and a bit cooler Wednesday, clear Wednesday night
• lows near 52 highs 69-64.
• Sunny and a bit warmer Thursday and Friday, clear Thursday night, mostly clear Friday night,
• Mostly sunny and a bit cooler Saturday, mostly clear at night,
• Then sunny Sunday.
• highs 69-65 lows 55-50. (seasonal averages high 66 low 53)

 

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Forecast for the Cascades in Lane County:

• Mostly clear tonight,
• Mostly sunny and a bit cooler Monday, clear Monday night,
• Then sunny and a bit warmer Tuesday and Wednesday, clear both nights.
• free air freezing level 14,000 ft. tonight through Wednesday night.
• lows 44-42 warming to 49 Wednesday night highs 70-80.
• Sunny and a bit warmer Thursday and Friday, clear each night,
• Then mostly sunny and a bit cooler Saturday and Sunday, mostly clear Saturday night.
• free air freezing level 14,000 ft. Thursday through Friday night, then 13,000 ft. Saturday through Sunday.
• highs 82-72 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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