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 19 in the Good category measuring Ozone.

Oakridge: The Air Quality Index is 16 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 18 in the Good category measuring Ozone.

Data courtesy of Lane Regional Air Protection Agency (LRAPA)

 

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Advisories:

• A RED FLAG WARNING IS IN EFFECT UNTIL 11 PM TONIGHT FOR THE SOUTHERN OREGON CASCADES AND THE SISKIYOU MOUNTAINS.
• A RED FLAG WARNING IS IN EFFECT UNTIL 8 PM TONIGHT FOR THE EASTERN ROGUE RIVER VALLEY AND THE WESTERN ROGUE BASIN.
• 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 tonight, becoming mostly cloudy late tonight,
• Cloudy Tuesday AM, partly cloudy and a bit warmer in the afternoon and evening, mostly cloudy late at night,
• 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.
• lows 53-50 warming to 52 Thursday night highs 77-80.
• 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 near 53. (seasonal averages high 77 low 49)

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Eugene-Springfield Pollen Count

Grass………. High (79)

Trees………. Moderate (23)

Last Counted: 6/26/17

Data Courtesy of Oregon Allergy Associates.

 

 

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Forecast for Roseburg:

• Partly cloudy with a slight (20%) chance of isolated thunderstorms this evening, just mostly cloudy late tonight and Tuesday AM, sunny and a bit cooler in the afternoon, mostly clear in the evening, mostly cloudy late at night,
• 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.
• lows 56-53 warming to 55 Thursday night highs 79-84.
• 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 near 56. (seasonal averages high 79 low 54)

 

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

• Mostly cloudy tonight with patchy coastal drizzle late and Tuesday AM, sunny in the afternoon, mostly clear in the evening, mostly cloudy late at night 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.
• lows 54-52 highs 62-64.
• 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 65-62 lows near 55. (seasonal averages high 63 low 52)

 

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Forecast for the Cascades in Lane County:

• Partly cloudy with a slight (20%) chance of showers and thunderstorms this evening (0.10 in. of rain possible, more in storms), just partly cloudy and a bit cooler late tonight and Tuesday AM, mostly sunny but cooler in the afternoon, mostly clear Tuesday night,
• Partly cloudy in the AM, mostly sunny and a bit cooler Wednesday afternoon, mostly clear at night,
• Mostly sunny and a bit warmer Thursday, then mostly clear Thursday night.
• snow level above 8,000 ft. tonight, free air freezing level 12,000 ft. Tuesday through Wednesday, 13,000 ft. Wednesday night, 13,000 ft. rising to 15,000 ft. Thursday, then 15,000 ft. Thursday night.
• lows 45-42 warming back to 45 Thursday night highs 69-72.
• 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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