Here is my weekly weather quiz question for the last time. What is  a “Back Door Cold Front?”  Here is the correct answer. A Back Door Cold Front is a cold front moving south or southwest along the Atlantic seaboard and Great Lakes; these are especially common during the spring months. They also occur here in the west as a cold front pushes southward from Canada and then moves from northeast to southwest across the Pacific Northwest usually bringing much colder air down from Canada. I’ll have a new weekly weather quiz question for you starting Monday. 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 Low Pressure Trough  (Shaded “U” shape with blue arrows) is continuing to enhance rain chances over Oregon. The graphics for days 3-7 show a frontal system approaching the coast Friday and moving through the Pacific Northwest next Saturday.

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Air Quality Index:

Eugene-Springfield: The Air Quality Index is 8 in the Good category measuring Particulate Matter.

Oakridge: The Air Quality Index is 8 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 1 in the Good category measuring Particulate Matter.

Data courtesy of Lane Regional Air Protection Agency (LRAPA)

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Advisories:

• A Health Advisory has been issued  for the water around Eagle Ridge County Park on Upper Klamath Lake. The park is located off Highway 140, 15 miles west of Klamath Falls in Klamath County. Water monitoring has confirmed the presence of blue-green algae and the toxins they produce in this area of Upper Klamath Lake. These toxin concentrations can be harmful to humans and animals.
• A Health Advisory has been issued for Detroit Lake, located 46 miles SE of Salem in Marion County. Water monitoring has confirmed the presence of blue-green algae and the toxins they produce in Detroit Lake. These toxin concentrations can be harmful to humans and animals. People should avoid swallowing water while swimming or inhaling water droplets as a result of high-speed water activities, such as water skiing or power boating, in areas where blooms are identified. Although toxins are not absorbed through the skin, people who have skin sensitivities may experience a puffy, red rash at the affected area.
• 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 cloudy with possible sun peeks and a (30%) chance of showers and a bit warmer today (under 0.10 in. of rain possible), partly cloudy with a slight (20%) chance of evening showers, mostly cloudy with a slight (20%) chance of isolated showers late tonight (under 0.10 in. of rain possible),
• Mostly cloudy and a bit cooler Monday with a slight (20%) chance of showers, just mostly cloudy late Monday night,
• Mostly cloudy with areas of AM drizzle, a bit warmer Tuesday with a slight (20%) chance afternoon showers, mostly cloudy in the evening, then partly cloudy late at night.
• highs 66-68 lows 49-44.
• A mix of clouds and sun and a bit warmer Wednesday, partly cloudy in the evening, becoming mostly cloudy with a slight (20%) chance of rain late at night and Thursday AM, a (30%) chance of rain and a bit warmer in the afternoon, a good (50%) chance of rain Thursday night,
• Mostly cloudy with a (40%) chance of AM rain, a slight (20%) chance of showers and a bit warmer Friday afternoon and evening, partly cloudy late at night and Saturday AM, then mostly sunny and a bit warmer Saturday afternoon.
• highs 72-77 lows 48-52. (seasonal averages high 72 low 47)

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Eugene-Springfield Pollen Count:

Grass………. High (25)

Trees………. Moderate (18)

Last Counted: 6/9/17

Data Courtesy of Oregon Allergy Associates.

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Forecast for Roseburg:

• Cloudy and a bit warmer with scattered showers today (0.25 in. of rain possible), mostly cloudy with a slight (20%) chance of isolated showers tonight (under 0.10 in. of rain possible),
• Mostly cloudy with a (30%) chance of showers Monday (under 0.10 in. of rain possible), a slight (20%) chance of evening showers, just mostly cloudy late at night,
• Partly cloudy and a bit warmer Tuesday and Tuesday night.
• highs 63-69 lows 50-48.
• Partly cloudy and a bit warmer Wednesday and in the evening, mostly cloudy late Wednesday night,
• A bit warmer with a slight (20%) chance of rain Thursday afternoon, mostly cloudy and a bit warmer with a slight (20%) chance of rain Thursday night and Friday AM, a slight (20%) chance of sprinkles in the afternoon and evening, partly cloudy late Friday night and Saturday AM, then becoming sunny and a bit warmer in the afternoon.
• highs 72-84 lows 50-55. (seasonal averages high 75 low 51)

 

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

• Cloudy with a (40%) chance of scattered showers and a bit cooler today (under 0.10 in. of rain possible), mostly cloudy with a slight (20%) chance of isolated showers tonight (under 0.10 in. of rain possible),
• Mostly cloudy with a (30%) chance of showers and a bit warmer Monday (under 0.10 in. of rain possible), mostly cloudy with a slight (20%) chance of inland evening showers, just mostly cloudy late at night,
• Then mostly cloudy a bit warmer Tuesday, partly cloudy at night.
• highs 58-60 lows 52-49.
• Partly cloudy Wednesday and in the evening, mostly cloudy late Wednesday night,
• Mostly cloudy with a slight (20%) chance of rain Thursday through Friday, a slight (20%) chance of evening sprinkles, partly cloudy Friday night and Saturday AM, then mostly sunny Saturday afternoon.
• highs 64-68 lows 52-55. (seasonal averages high 61 low 50)

 

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Forecast for the Cascades in Lane County:

• Cloudy with a good (50%) chance of AM rain and snow showers, rain and snow showers and a bit warmer this afternoon (0.10 in. of rain possible), mostly cloudy with a good (50%) chance of showers tonight (0.10 in. of rain possible),
• A mix of clouds and sun and a bit cooler with a good (50%) chance of showers Monday, mostly cloudy with a (40%) chance of showers in the evening, then partly cloudy with a (40%) chance of showers late Monday night,
• Partly cloudy with a slight (20%) chance of showers Tuesday AM, then just partly cloudy at night.
• snow level 4,500 ft. rising to 6,000 ft. this afternoon, 6,500 ft. tonight, 6,000 ft. Monday, 7,000 ft. Monday night, 7,500 ft. Tuesday afternoon, then free air freezing level 10,000 ft. falling to 8,000 ft. late Tuesday night.
• highs 48-57 lows near 35.
• Partly cloudy and a bit warmer Wednesday and in the evening, mostly cloudy with a slight (20%) chance of rain late Wednesday night,
• Mostly cloudy with a slight (20%) chance of AM rain, a bit warmer with a (30%) chance of rain Thursday afternoon and at night,
• A (30%) chance of AM rain, a slight (20%) chance of showers Friday afternoon, partly cloudy with a slight (20%) chance of evening showers, just partly cloudy late Friday night,
• Partly cloudy Saturday AM, then mostly sunny and a bit warmer in the afternoon.
• free air freezing level 8,000 ft. rising to 10,000 ft. Wednesday afternoon, snow level 8,000 ft. Wednesday night, above 8,000 ft. Thursday through Friday night, free air freezing level 14,000 ft.rising to 15,000 ft. Saturday afternoon.
• highs 62-73 lows 38-44.

 

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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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