Here is my new 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) that took over control of the Pacific Northwest weather bringing lots of sunshine and heat moved to the east to be replaced by a trough of low pressure (Shaded “U” shape with blue arrows). The graphics for days 1-3 shows a frontal system that moved through Oregon cooling us down dramatically bringing in cooler and more moist marine air. The graphics for days 3-7 show the next major frontal system will move over the Pacific Northwest next Sunday and Monday.

 

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Air Quality Index:

Eugene-Springfield: The Air Quality Index is 14 in the Good category measuring Ozone.

Oakridge: The Air Quality Index is 6 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 14 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:

• Partly cloudy and a bit warmer this afternoon and tonight,
• Cloudy in the AM, partly cloudy Wednesday afternoon through Thursday AM, mostly sunny and a bit warmer in the afternoon, then mostly clear Thursday night.
• highs 77-80 lows 49-52.
• Mostly sunny and a bit warmer Friday, partly cloudy at night and Saturday AM, mostly sunny in the afternoon, partly cloudy at night,
• Partly cloudy in the AM then mostly sunny and a bit cooler Sunday and Monday, just partly cloudy Sunday night.
• highs 82-76 lows 52-54 cooling back to 52 Sunday night. (seasonal averages high 77 low 49)

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Eugene-Springfield Pollen Count

Grass………. High (30)

Trees………. Low (8)

Last Counted: 6/27/17

Data Courtesy of Oregon Allergy Associates.

 

 

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Forecast for Roseburg:

• Sunny and a bit cooler this afternoon, mostly clear this evening, mostly cloudy late tonight,
• Partly cloudy Wednesday AM, sunny and a bit warmer in the afternoon, clear in the evening, partly cloudy late Wednesday night,
• Mostly sunny and a bit warmer Thursday, then mostly clear at night.
• highs 79-84 lows 53-55.
• Mostly sunny Friday, mostly clear at night,
• Mostly sunny and a bit cooler Saturday, Sunday and Monday, mostly clear each night.
• highs 84-78 lows 55-58. (seasonal averages high 79 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, mostly cloudy late tonight and Wednesday AM, sunny and a bit warmer in the afternoon, mostly clear in the evening, mostly cloudy late Wednesday night,
• AM clouds, sunny and a bit warmer Thursday afternoon, then mostly clear at night.
• highs 62-64 lows near 52.
• Mostly sunny and a bit warmer Friday and Saturday, mostly clear Saturday night,
• Then partly cloudy Sunday and Monday (a bit cooler), mostly clear Sunday night,
• highs 64-62 lows near 54. (seasonal averages high 63 low 52)

 

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Forecast for the Cascades in Lane County:

• Mostly sunny but cooler this afternoon, mostly clear tonight,
• Mostly sunny and a bit cooler Wednesday, mostly clear at night,
• Mostly sunny and a bit warmer Thursday, then mostly clear Thursday night.
• Snow level above 8,000 ft. today, free air freezing level 13,000 ft. falling to 12,000 ft. tonight, 13,000 ft. Wednesday and Wednesday night, 13,000 ft. rising to 15,000 ft. Thursday, then 15,000 ft. falling to 14,000 ft. Thursday night.
• highs 69-72 lows 42-45.
• Mostly sunny and a bit warmer Friday and Saturday (a bit cooler), mostly clear both nights,
• Partly cloudy Sunday AM, mostly sunny and a bit cooler in the afternoon, mostly clear at night,
• Then mostly sunny and a bit cooler Monday.
• free air freezing level 14,000 ft. Friday through Saturday night, 15,000 ft. Sunday and Sunday night, then 14,000 ft. Monday.
• highs 73-69 lows 46-43.

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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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