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 “Arch” shape with blue arrows aimed Southwest to Northeast) will keep warm air headed our way. An Upper Level Low Pressure Trough (Shaded “U” shape with blue arrows) to our north is sending weak disturbances our way causing minor fluctuations with out temperatures going up and down a bit.  The graphics for days 3-7 show the frontal systems that attempt to move into the Pacific Northwest Thursday through Monday of next week.

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Air Quality Index:

Eugene-Springfield: The Air Quality Index is 26 in the Good category measuring Particulate Matter.

Oakridge: The Air Quality Index is 12 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 13 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:

• Sunny and a bit warmer today, clear tonight,
• Sunny and a bit cooler Wednesday, partly cloudy Wednesday night,
• Then partly cloudy and a bit cooler Thursday and at night.
• highs 85-79 lows 50-55 cooling to 52 Thursday night.
• Partly cloudy Friday AM, mostly sunny and a bit warmer in the afternoon, mostly clear Friday night,
• Then mostly sunny and a bit warmer Saturday, Sunday, and Monday, mostly clear each night,
• highs 83-86 lows 53-55. (seasonal averages high 83 low 52)

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Eugene-Springfield Pollen Count

Grass………. Moderate (8)

Trees………. Low (3)

Last Counted: 7/13/17

Data Courtesy of Oregon Allergy Associates.

Note: It would seem the pollen season is all but over.

 

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Forecast for Roseburg:

• Sunny and a bit warmer today, clear tonight,
• Partly cloudy in the AM, sunny and a bit cooler Wednesday afternoon, clear in the evening, mostly cloudy with patchy fog late Wednesday night,
• AM clouds and patchy fog with a slight (20%) chance of showers, then partly cloudy and a bit cooler Thursday afternoon and at night.
• highs 84-80 lows 54-56.
• Partly cloudy and a bit warmer Friday, mostly clear Friday night,
• Then mostly sunny and a bit warmer Saturday and Sunday, mostly clear Saturday  night, clear Sunday night,
• Then sunny and a bit cooler Monday.
• highs 85-89 cooling to 87 Monday lows 56-62. (seasonal averages high 85 low 57)

 

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

• Cloudy with patchy AM fog, patchy AM coastal drizzle, mostly sunny this afternoon, partly cloudy this evening, mostly  cloudy with patchy fog late tonight and patchy coastal drizzle late,
• Mostly cloudy with patchy coastal fog Wednesday while patchy AM inland fog, partly cloudy in the afternoon, partly cloudy with patchy evening coastal fog and a slight (20%) chance of showers late at night while mostly clear in the evening inland and mostly cloudy with a patchy fog and a slight (20%) chance of inland showers late Wednesday night,
• Cloudy with a slight (20%) chance of AM showers, partly cloudy Thursday and at night,
• highs near 63 lows near 54.
• Partly cloudy Friday and Friday night,
• Mostly sunny and a bit warmer Saturday and Sunday, mostly clear at night,
• Then mostly sunny and a bit cooler Monday.
• highs 63-67 cooling back to 63 Monday 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 warmer today, but a slight (20%) chance of a thunderstorm near Willamette Pass, mostly clear tonight,
• Sunny and a bit cooler Wednesday, mostly clear Wednesday night,
• AM clouds and sun, mostly sunny and a bit cooler Thursday afternoon, then mostly clear Thursday night.
• free air freezing level 12,000 ft. today through Thursday night,
• highs 74-67 lows near 45.
• Mostly sunny and a bit warmer Friday and Saturday, mostly clear at night,
• Mostly sunny and a bit warmer Sunday and Monday, mostly clear Sunday night.
• free air freezing level above 12,000 ft. Friday through Monday.
• highs 74-78 lows 47-52.

 

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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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