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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An Upper Level High Pressure Ridge (Shaded “Arch”shape with blue arrows ) will strengthen over us warming temperatures into the low 90s. The graphics for days days 1-3 show a weak frontal system approaching the coast Sunday. The graphics for days 3-7 show frontal systems trying to make an impact on us Monday and again next Thursday.

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Air Quality Index:

Eugene-Springfield: The Air Quality Index is 18 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 17 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:

• Mostly sunny and a bit warmer this afternoon and Saturday, mostly clear both nights,
• AM clouds, mostly sunny and a bit cooler Sunday, then mostly clear Sunday night.
• highs 84-92 cooling to 88 Sunday lows 55-59 cooling back to 55 Sunday night.
• Partly cloudy and a bit cooler Monday and Monday night,
• AM sun, partly cloudy Tuesday and at night,
• Partly cloudy Wednesday through Thursday AM, then mostly sunny Thursday afternoon.
• highs 85-82 lows 54-50. (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 warmer this afternoon, mostly clear tonight,
• Sunny and a bit warmer Saturday, mostly clear in the evening, partly cloudy late Saturday night,
• Mostly cloudy Sunday AM, mostly sunny and a bit warmer in the afternoon, partly cloudy with a slight (20%) chance of thunderstorms Sunday night.
• highs 86-93 lows 57-60.
• Partly cloudy and a bit cooler with a slight (20%) chance of thunderstorms Monday and in the evening, becoming mostly clear late at night,
• Mostly sunny and a bit cooler Tuesday and Wednesday, mostly clear Tuesday night, partly cloudy Wednesday night,
• Then partly cloudy and a bit warmer Thursday.
• highs 89-85 lows near 56. (seasonal averages high 86 low 57)

 

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

• Sunny this afternoon, mostly clear tonight,
• Sunny and a bit warmer Saturday, mostly clear in the evening, mostly cloudy with patchy fog and drizzle late Saturday night and Sunday AM, sunny and a bit warmer in the afternoon, mostly clear with a slight (20%) chance of evening thunderstorms, then partly cloudy late Sunday night.
• highs 63-68 cooling to 65 Sunday lows 55-57 cooling back to 55 Sunday night.
• A slight (20%) chance of AM showers, partly cloudy and a bit cooler Monday afternoon, mostly clear at night,
• Mostly sunny in the AM, partly cloudy and a bit cooler Tuesday afternoon, partly cloudy Tuesday night through Wednesday evening, mostly cloudy late Wednesday night,
• Mostly cloudy Thursday AM, then sunny and a bit cooler in the afternoon.
• highs 64-62 lows near 54. (seasonal averages high 65 low 53)

 

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Forecast for the Cascades in Lane County:

• Sunny and a bit warmer today and Saturday, mostly clear tonight, partly clear Saturday evening and clear at night,
• AM sun, partly cloudy and a bit warmer with a slight (20%) chance of showers and thunderstorms Sunday afternoon and evening, then a slight (20%) chance of showers late at night.
• free air freezing level above 12,000 ft. today through Saturday night, snow level above 8,000 ft. Sunday and Sunday night.
• highs 74-82 lows 48-54.
• Partly cloudy with a slight (20%) chance of showers 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,
• Party cloudy and a bit cooler Tuesday with a slight (20%) chance of afternoon and evening thunderstorms, partly cloudy late at night,
• Mostly sunny and a bit cooler Wednesday, partly cloudy at night and Thursday AM, the mostly sunny and a bit cooler in the afternoon.
• snow level above 8,000 ft. Monday and in the 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, then free air freezing level above 12,000 ft. late Tuesday night through Thursday.
• highs 76-72 lows 52-47.

 

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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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