Here is my weekly weather quiz question. What is a “Baroclinic leaf shield?” The first person to post the correct answer as a comment on this page will win a week of free personalized weather forecasts tailored to your needs.  Good luck.

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Southwest airflow from the Jet Stream (Shaded shape with blue arrows aimed Southwest to Northeast) will keep warm air headed our way. A weak surface front moved inland overnight bringing a fee more clouds that are keeping us a bit cooler. The graphics for days 3-7 show frontal systems trying to make an impact on us Sunday and again next Wednesday.

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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 15 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 21 in the Good category measuring Ozone.

Data courtesy of Lane Regional Air Protection Agency (LRAPA)

 

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Advisories:

•  The Oregon Health Authority has updated the health advisory issued June 30 for Lake Billy Chinook, located about 12 miles west of Madras in Jefferson County. The update lifts the advisory on those areas of the Deschutes and Crooked River of Lake Billy Chinook arms affected by the advisory, and confines the advisory on the Metolius Arm to Perry South Cove. Water monitoring has confirmed that the level of blue-green algae toxins are below guideline values for human exposure. However, OHA recommends that people remain cautious when using the lake, particularly with pets because toxins are still well above the very low exposure levels established for dogs.
• A Permanent Health Advisory remains in effect for the South Umpqua River and Lawson Bar. Pools in the bedrock along the rivers edge are known to develop Blue-green Algae (cyanobacterial) blooms that can be harmful to pets and people if accidental ingestion occurs. Signs have been posted along several access areas along the river.

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Forecast for the Southern and lower Mid Willamette Valley including Eugene-Springfield and Albany-Corvallis:

• A mix of clouds and sun this afternoon, partly cloudy tonight and Friday AM, mostly sunny and a bit warmer in the afternoon, clear in the evening, partly cloudy at night,
• Mostly sunny and a bit warmer Saturday, clear in the evening, then partly cloudy Saturday night.
• highs 80-90 lows 50-58.
• Mostly sunny and a bit warmer Sunday, mostly clear Sunday  night,
• Mostly sunny and a bit cooler Monday and Tuesday, mostly clear Monday night, partly cloudy Tuesday night,
• Then partly cloudy and a bit cooler Wednesday.
• highs 92-82 lows 55-53. (seasonal averages high 84 low 52)

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Eugene-Springfield Pollen Count

Grass………. Moderate (9)

Trees………. Low (5)

Last Counted: 7/20/17

Data Courtesy of Oregon Allergy Associates.

Note: It would seem the pollen season just about over.

 

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Forecast for Roseburg:

• Sunny and a bit cooler this afternoon, mostly clear late tonight,
• Then sunny and a bit warmer Friday and Saturday, clear Friday night and Saturday evening, partly cloudy late Saturday night.
• highs 82-92 lows 55-62.
• Partly cloudy with a slight (20%) chance of thunderstorms Sunday through Monday evening, becoming mostly clear late at night,
• Then mostly sunny and a bit cooler Tuesday and Wednesday, mostly clear Tuesday night.
• highs 92-86 lows 59-56. (seasonal averages high 86 low 57)

 

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

• Partly cloudy this afternoon and evening, mostly clear this evening, partly cloudy late tonight,
• Patchy AM fog, sunny Friday afternoon, mostly clear at night,
• Sunny Saturday, then partly cloudy Saturday night.
• highs near 63 lows near 54.
• Partly cloudy Sunday through Monday, partly cloudy Sunday night, mostly clear Monday night,
• Mostly sunny Tuesday, then partly cloudy Tuesday night and Wednesday.
• highs 63 lows near 54. (seasonal averages high 65 low 53)

 

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Forecast for the Cascades in Lane County:

• Mostly sunny and a bit cooler this afternoon, mostly clear tonight,
• Then mostly sunny and a bit warmer Friday and Saturday, clear both nights,
• free air freezing level above 12,000 ft. today through Saturday night,
• highs 67-80 lows 44-50.
• AM sun, partly cloudy and a bit warmer with a slight (20%) chance of showers and thunderstorms Sunday afternoon and evening, just partly cloudy late at night,
• Mostly sunny Monday AM, partly cloudy and a bit cooler with a slight (20%) chance of showers and thunderstorms in the afternoon and evening, clearing late Monday night,
• Mostly sunny and a bit cooler Tuesday, partly cloudy at night,
• Then mostly sunny Wednesday.
• snow level above 8,000 ft. Sunday through Monday evening, free air freezing level above 12,000 ft. late Monday night and Tuesday AM, snow level above 8,000 ft. Tuesday afternoon and evening, free air freezing level 12,000 ft. late Tuesday night and Wednesday.
• highs 82-74 lows 53-48.

 

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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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