Here is my weekly weather quiz question. What is the “Backwater Effect?”  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 slowly migrate across Oregon. That means we’ll slowly warm up a bit. The graphics for days 3-7 show the next major frontal system will move over the Pacific Northwest Monday through Tuesday and another one approaching late Thursday. So far, the 4th of July looks dry with temperatures near 80. That’s just about normal.

 

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Air Quality Index:

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

Oakridge: The Air Quality Index is 20 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 10 in the Good category measuring Ozone.

Data courtesy of Lane Regional Air Protection Agency (LRAPA)

 

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Advisories:

• 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 just a bit cooler this afternoon, mostly clear this evening, mostly cloudy late tonight,
• AM clouds with patchy drizzle, partly cloudy and a bit cooler Saturday afternoon, mostly clear Saturday night,
• Cloudy with patchy drizzle a bit warmer Sunday afternoon, mostly clear in the evening, then mostly cloudy late at night.
• highs 80-78 warming to 82 Sunday lows 54-50 warming to 55 Sunday night.
• AM clouds Monday, mostly sunny and a bit warmer in the afternoon, mostly clear Monday night,
• Mostly sunny and slightly cooler Tuesday (Independence Day), clear at night,
• Sunny Wednesday, clear Wednesday night,
• Then sunny and a bit warmer Thursday.
• highs 83-80 warming back to 83 Thursday lows 50-53. (seasonal averages high 78 low 50)

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Eugene-Springfield Pollen Count

Grass………. High (100)

Trees………. Moderate (16)

Last Counted: 6/30/17

Data Courtesy of Oregon Allergy Associates.

 

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Forecast for Roseburg:

• Sunny and a bit cooler this afternoon and evening, mostly cloudy with a slight (20%) chance of patchy drizzle late tonight and Saturday AM, mostly cloudy in the afternoon, mostly clear in the evening, partly cloudy late Saturday night,
• Mostly sunny and a bit warmer Sunday, then mostly clear at night.
• highs 79-85 lows 55-58.
• AM clouds, mostly sunny and a bit cooler Monday, mostly clear Monday night,
• Mostly sunny and a bit warmer Tuesday (Independence Day), mostly clear at night,
• Sunny and a bit cooler Wednesday, clear at night,
• Then sunny and a bit warmer Thursday.
• highs 82-84 lows 55-57. (seasonal averages high 80 low 54)

 

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

• Cloudy at the shore while clouds clearing to mostly sunny inland and a bit cooler this afternoon, cloudy with patchy inland drizzle late tonight,
• Mostly cloudy with patchy AM drizzle, mostly cloudy and a bit warmer Saturday afternoon, mostly clear in the evening, partly cloudy late Saturday night,
• Partly cloudy and a bit warmer Sunday, mostly clear in the evening, then mostly cloudy late at night.
• highs 62-65 lows 53-55.
• AM clouds, mostly sunny and a bit cooler Monday afternoon, mostly clear Monday night,
• Mostly sunny Tuesday (Independence Day), mostly clear at night,
• Then mostly sunny Wednesday and Thursday, mostly clear Wednesday night.
• highs near 64 lows 52-54. (seasonal averages high 63 low 52)

 

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Forecast for the Cascades in Lane County:

• Sunny this AM, partly cloudy and a bit warmer with a slight (20%) chance of afternoon and evening showers and thunderstorms mainly near the crest, patchy drizzle late tonight and Saturday AM, mostly sunny and a bit cooler in the afternoon, clear Saturday night,
• Sunny and a bit warmer Sunday, then mostly clear at night.
• snow level above 8,000 ft. today this evening, free air freezing level 13,000 ft. rising to 14,000 ft. Saturday afternoon, 14,000 ft. rising to 15,000 ft. Saturday night, then 16,000 ft. Sunday and Sunday night.
• highs 75-68 warming to 76 Sunday lows 47-45 warming back to 47 Sunday night.
• Mostly sunny and a bit cooler Monday, mostly clear at night,
• Sunny and a bit cooler Tuesday (Independence Day), clear at night,
• Sunny and a bit cooler Wednesday, clear Wednesday night.
• Then sunny Thursday.
• free air freezing level 15,000 ft. Monday through Thursday.
• highs 73-75 cooling to 70 Wednesday warming to 73 Thursday lows 44-48.

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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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