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 Sunday and Monday. So far, the 4th of July looks dry with temperatures in the mid 70s. That’s a bit below normal.

 

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Air Quality Index:

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

Oakridge: The Air Quality Index is 15 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 19 in the Good category measuring Particulate Matter.

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 a bit warmer this afternoon, mostly clear tonight,
• AM clouds, sunny and a bit cooler Friday, partly cloudy at night and Saturday AM, mostly sunny and a bit cooler in the afternoon, then partly cloudy in the evening, mostly cloudy Saturday night.
• highs 83-78 lows near 52.
• AM clouds and sun, mostly sunny and a bit warmer Sunday afternoon, partly cloudy at night and Monday AM, mostly sunny and a bit cooler in the afternoon, mostly clear Monday night,
• Mostly sunny Tuesday (Independence Day), clear at night,
• Then sunny Wednesday.
• highs 82-77 lows 55-52. (seasonal averages high 77 low 50)

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Eugene-Springfield Pollen Count

Grass………. High (49)

Trees………. Low (6)

Last Counted: 6/28/17

Data Courtesy of Oregon Allergy Associates.

 

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Forecast for Roseburg:

• Mostly sunny and a bit warmer this afternoon, mostly clear this evening, partly cloudy with patchy fog and a slight (20%) chance of patchy drizzle late tonight,
• Mostly cloudy Friday AM, partly cloudy in the afternoon, mostly cloudy with a slight (20%) chance of patchy drizzle late at night,
• Mostly cloudy with patchy drizzle Saturday AM, partly cloudy and a bit cooler in the afternoon, mostly clear in the evening, then partly cloudy at night.
• highs 85-80 lows near 55.
• Partly cloudy in the AM, mostly sunny and a bit warmer Sunday afternoon, partly cloudy Sunday night,
• Mostly sunny and a bit cooler Monday and Tuesday (Independence Day), mostly clear Monday night,
• Then sunny and a bit warmer Wednesday.
• highs 85-82 warming to 86 Wednesday lows 58-54. (seasonal averages high 80 low 54)

 

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

• Sunny this afternoon, mostly clear this evening, partly cloudy this evening, mostly cloudy with patchy fog ad drizzle late tonight and Friday AM, mostly cloudy in the afternoon and evening, mostly cloudy with patchy drizzle late Friday night,
• Mostly cloudy with patchy AM drizzle, then partly cloudy Saturday afternoon and at night.
• highs near 64 lows near 53.
• Partly cloudy and a bit warmer Sunday, partly cloudy Sunday night,
• Partly cloudy and a bit cooler Monday, mostly clear at night,
• Then mostly sunny Tuesday (Independence Day) and Wednesday, mostly clear Tuesday night.
• highs 65-63 lows 54-52. (seasonal averages high 63 low 52)

 

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Forecast for the Cascades in Lane County:

• Sunny and a bit warmer this afternoon, mostly clear tonight,
• Mostly sunny Friday and partly cloudy with a slight (20%) chance of afternoon showers and thunderstorms near the crest, partly cloudy with a slight (20%) chance of evening showers and  thunderstorms Friday evening, just partly cloudy at night and Saturday AM, mostly sunny and a bit cooler in the afternoon, then mostly clear at night.
• free air freezing level 14,000 ft. rising to 15,000 ft. this afternoon, 15,000 ft. tonight, snow level above 9,000 ft. Friday and Friday night, free air freezing level 14,000 ft. Saturday, 15,000 ft. rising to 16,000 ft. Saturday night.
• highs 75-69 lows near 46.
• Mostly sunny and a bit warmer Sunday and Monday (a bit cooler), mostly clear both nights,
• Sunny and a bit cooler Tuesday (Independence Day), clear at night,
• Then sunny and a bit warmer Wednesday.
• free air freezing level 16,000 ft. Sunday, 16,000 ft. falling to 15,000 ft. Sunday night, 15,000 ft. Monday and Monday night, 15,000 ft. falling to 14,000 ft. Tuesday, 14,000 ft. rising to 15,000 ft. Tuesday night, then 15,000 ft. falling to 14,000 ft. Wednesday.
• highs 76-70 lows 46-44 warming back to 46 Tuesday night.

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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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