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 enhancing rain chances for a couple more days. The graphics for days 3-7 show one frontal system falling apart as it approaches the Pacific Northwest and a second one nearing the coast 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 11 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 showers this AM, showers likely (70%) with possible sun breaks and a slight (20%) chance of thunderstorms this afternoon (0.25 in. of rain possible, more in storms), cloudy with showers likely (70%) with a slight (20%) chance of thunderstorms this evening, a slight (20%) chance of showers late tonight (under 0.10 in. of rain possible, more in storms),
• Mostly cloudy with possible sun peeks and a slight (20%) chance of showers and a bit warmer Sunday (under 0.10 in. of rain possible) and at night (under 0.10 in. of rain possible),
• Mostly cloudy with a (30%) chance of AM showers, a mix of clouds and sun and a bit cooler Monday with a slight (20%) chance of showers in the afternoon and evening, a slight (20%) chance of rain or drizzle late Monday night.
• highs 60-65 cooling to 63 Monday lows 45-48 cooling back to 45 Monday night.
• A mix of clouds and sun with a slight (20%) chance of rain or drizzle Tuesday AM, a mix of clouds and sun and a bit warmer Tuesday afternoon, partly cloudy at night,
• A mix of clouds and sun and a bit warmer Wednesday, partly cloudy in the evening, mostly cloudy with a slight (29%) chance of rain late at night and Thursday AM, a (30%) chance of rain and a bit warmer in the afternoon, a (40%) chance of rain at night,
• Mostly cloudy with a (40%) chance of AM rain, then a slight (20%) chance of rain and a bit warmer Friday afternoon.
• highs 69-75 lows 45-52. (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 AM showers, showers and isolated thunderstorms and a bit cooler this afternoon (0.50 in. of rain possible) and evening, a good (50%) chance of showers late tonight (0.25 in. of rain possible),
• Cloudy with a good (50%) chance of AM showers, a bit warmer with showers likely (70%) Sunday afternoon (0.25 in. of rain possible), a (30%) chance of showers Sunday night (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, then just mostly cloudy at night.
• highs 60-63lows 47-50.
• Mostly cloudy with a slight (20%) chance of AM drizzle, sunny and a bit warmer Tuesday afternoon, just partly cloudy and a bit warmer Tuesday night mostly cloudy through Wednesday night,
• Partly cloudy Thursday AM, mostly cloudy and a bit warmer with a slight (20%) chance of rain in the afternoon and at night,
• Mostly cloudy with a slight (20%) chance of AM rain, the  partly cloudy and a bit warmer with a slight (20%) chance of rain Friday afternoon.
• highs 70-80 lows 49-52. (seasonal averages high 74 low 51)

 

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

• Mostly cloudy with coastal showers and isolated thunderstorms and a bit cooler this afternoon while inland AM showers and inland showers and thunderstorms and a bit cooler this afternoon (0.50 in. of rain possible), showers likely (70%) with isolated thunderstorms this evening, a good (50%) chance of showers late tonight (0.25 in. of rain possible),
• Cloudy with a (40%) chance of coastal showers and a bit warmer Sunday while a (40%) chance of AM inland showers and inland showers likely (70%) in the afternoon (under 0.10 in. of rain possible), a slight (20%) chance of coastal showers late at night while a slight (20%) chance of inland showers Sunday night (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), then mostly cloudy with a slight (20%) chance of drizzle late at night.
• highs 57-60 lows 49-52 cooling to 50 Monday night.
• Mostly cloudy with a slight (20%) chance of AM drizzle, partly cloudy a bit warmer Tuesday afternoon through Thursday AM, mostly cloudy with a slight (20%) chance of showers in the afternoon, a slight (20%) chance of rain Thursday night and Friday AM, then just mostly cloudy and a bit warmer Friday.
• highs 62-66 lows 50-53. (seasonal averages high 61 low 50)

 

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Forecast for the Cascades in Lane County:

• AM rain and snow showers, mostly cloudy and a bit cooler with rain and snow showers and a slight (20%) chance of thunderstorms this afternoon, evening rain and snow showers likely (70%) with a slight (20%) chance of thunderstorms, (0.25 in. of rain possible, 1-3 in. of snow possible), a good (50%) chance of  rain and snow showers late tonight (0.25 in. of rain possible, 2 in. of snow possible),
• Cloudy with rain and snow showers likely (70%) and a bit warmer Sunday afternoon (0.10 in. of rain possible, 1 in. of snow possible), mostly cloudy with a good (50%) chance of showers Sunday night,
• Mostly cloudy and a bit cooler with a good (50%) chance of showers Monday, a (30%) chance of showers in the evening, then a slight (20%) chance of rain or drizzle late Monday night.
• snow level 5,000 ft. today and tonight, 4,500 ft. Sunday, 6,500 ft. Sunday night, 5,500 ft. Monday, then 6,500 ft. Monday night.
• highs 43-48 cooling to 46 Monday lows 33-35.
• Partly cloudy and a bit warmer Tuesday through Wednesday, partly cloudy with a slight (20%) chance of rain  Wednesday night,
• A mix of clouds and sun and a bit warmer with a slight (20%) chance of rain Thursday and Friday, mostly cloudy with a slight (20%) chance of rain Thursday night.
• free air freezing level 8,000 ft. rising to 9,000 ft. Tuesday, 9,000 ft. Tuesday night and Wednesday, snow level 8,000 ft. Wednesday night, then above 8,000 ft. Thursday through Friday.
• highs 60-68 lows 35-40.

 

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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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