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) which is south of us in California is continuing to hang on to rain chances over Oregon. The graphics for days 3-7 show frontal systems approaching the coast Friday and moving through the Pacific Northwest through the workweek.

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Air Quality Index:

Eugene-Springfield: The Air Quality Index is 10 in the Good category measuring Particulate Matter.

Oakridge: The Air Quality Index is 16 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:

• Partly cloudy with a slight (20%) chance of isolated evening showers, just mostly cloudy late tonight (under 0.10 in. of rain possible),
• Mostly cloudy with possible sun breaks and a bit cooler Monday with a slight (20%) chance of afternoon showers, just mostly cloudy late Monday night,
• Areas of AM drizzle, a mix of clouds and sun and a bit warmer Tuesday with a slight (20%) chance afternoon showers, mostly cloudy in the evening, partly cloudy late at night,
• A mix of clouds and sun and a bit warmer Wednesday, partly cloudy in the evening, then becoming mostly cloudy with a (40%) chance of rain late Wednesday night.
• lows 49-44 warming to 47 Wednesday night highs 63-72.
• Mostly cloudy with a (40%) chance of rain and a bit cooler Thursday, a good (50%) chance of evening rain, a good (50%) chance of showers late Thursday night,
• Cloudy and a bit warmer with a good (50%) chance of showers Friday, a slight (20%) chance of evening showers, just partly cloudy late at night,
• Partly cloudy and a bit warmer Saturday through Sunday AM, then mostly sunny and a bit warmer Sunday afternoon.
• highs 70-80 lows 55-52. (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:

• Mostly cloudy with a slight (20%) chance of scattered showers this evening, a (30%) chance of showers late tonight (under 0.10 in. of rain possible),
• A slight (20%) chance of isolated showers and a bit cooler Monday (under 0.10 in. of rain possible), a slight (20%) chance of showers at night,
• Mostly cloudy and a bit warmer Tuesday, partly cloudy Tuesday night and Wednesday, then mostly cloudy Wednesday night.
• lows 50-48 warming to 52 Wednesday night highs 62-72.
• Mostly cloudy and a bit warmer with a slight (20%) chance of rain Thursday afternoon, a (30%) chance of rain and a bit warmer Thursday night and Friday, a slight (20%) chance of showers in the evening, partly cloudy late at night,
• Then mostly sunny and a bit warmer Saturday and Sunday, mostly clear Saturday night.
• highs 76-89 lows 58-55. (seasonal averages high 75 low 51)

 

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

• Mostly cloudy with a slight (20%) chance of inland isolated showers this evening, just mostly cloudy  tonight (under 0.10 in. of rain possible),
• Mostly cloudy with a slight (20%) chance of isolated showers and a bit cooler Monday (under 0.10 in. of rain possible), a slight (20%) chance of coastal showers, late Monday night,
• Just mostly cloudy a bit warmer Tuesday, partly cloudy at night and Wednesday AM, then mostly cloudy in the afternoon and Wednesday night.
• lows 52-49 warming back to 52 Wednesday night highs 58-60.
• Mostly cloudy and a bit warmer with a slight (20%) chance of rain Thursday through Friday AM, a slight (20%) chance of showers and a bit warmer in the afternoon and evening, just partly cloudy Friday night,
• Partly cloudy Saturday AM, sunny and a bit warmer in the afternoon, mostly clear at night,
• Then mostly sunny Sunday afternoon.
• highs 62-68 lows near 55. (seasonal averages high 61 low 50)

 

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Forecast for the Cascades in Lane County:

• Mostly cloudy with a good (50%) chance of scattered showers tonight (0.10 in. of rain possible),
• Mostly cloudy and a bit cooler with a (40%) chance of rain and snow showers Monday, partly cloudy with a (40%) chance of showers Monday night (0.10 in. of rain possible),
• Areas of drizzle with a (30%) chance of showers Tuesday AM, a mix of clouds and sun and a bit warmer with a slight (20%) chance of afternoon showers, just partly cloudy at night,
• Mostly sunny in the AM, partly cloudy and a bit warmer Wednesday and in the evening, then becoming mostly cloudy with a slight (20%) chance of rain late Wednesday night.
• snow level 6,500 ft. tonight, 6,000 ft. Monday, above 8,000 ft. Monday night, 7,500 ft. Tuesday afternoon, free air freezing level 10,000 ft. rising to 11,000 ft. late Tuesday night, 11,000 ft. falling to 10,000 ft. Wednesday and in the evening, then snow level above 8,000 ft. late Wednesday night.
• lows 35-39 highs 45-62.
• Mostly cloudy with a slight (20%) chance of AM rain, a (30%) chance of rain Thursday afternoon, a (40%) chance of evening rain, a (40%) chance of showers late at night and Friday (a bit warmer), a slight (20%) chance of evening showers, just partly cloudy late Friday night,
• Partly cloudy Saturday AM, mostly sunny and a bit warmer in the afternoon, mostly clear at night,
• Then mostly sunny and a bit warmer Sunday.
• snow level above 8,000 ft. Thursday through Friday evening, free air freezing level 13,000 ft.late Friday night, 13,000 ft. rising to 14,000 ft. Saturday afternoon, 14,000 ft. rising to 15,000 ft. Saturday night, then 15,000 ft. rising to 16,000 ft. Sunday.
• highs 62-72 lows 44-46.

 

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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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