Here is my weekly weather quiz question. What is  a “Back Door Cold Front?”  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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The graphics for days 1-3 show a frontal system moving into Oregon. An Upper Level Low Pressure Trough  (Shaded “U” shape with blue arrows) takes over enhancing rain chances for a few days. The graphics for days 3-7 show a frontal system falling apart as it approaches the Pacific Northwest.

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Air Quality Index:

Eugene-Springfield: The Air Quality Index is 11 in the Good category measuring Particulate Matter.

Oakridge: The Air Quality Index is 20 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 2 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:

• Rain this AM, a good (50%) chance of showers and much cooler this afternoon (0.25 in. of rain possible), a slight (20%) chance of evening showers, partly cloudy and cooler late tonight (under 0.10 in. of rain possible),
• Mostly cloudy with a slight (20%) chance of showers Friday AM, showers likely (70%) and a slight (20%) chance of thunderstorms and a bit cooler in the afternoon (0.25 in. of rain possible) and evening, showers likely (70%) late Friday night (0.25 in. of rain possible) and Saturday AM, showers likely (70%) with a slight (20%) chance of thunderstorms and a bit cooler in the afternoon and evening, then a good (50%) chance of showers late Saturday night.
• highs 63-60 lows 47-45.
• Mostly cloudy with a (40%) chance of showers Sunday AM, a slight (20%) chance of showers and a bit warmer in the afternoon and Sunday night,
• Mostly cloudy with a slight (20%) chance of AM showers, partly cloudy and a bit warmer with a slight (20%) chance of showers Monday afternoon, partly cloudy with a slight (20%) chance of showers in the evening, mostly cloudy with a slight (20%) chance of showers late at night,
• A mix of clouds and sun and a bit warmer Tuesday with a slight (20%) chance of AM showers, partly cloudy at night and Wednesday AM, then mostly sunny and a bit warmer Wednesday afternoon.
• highs 64-69 lows 46-42. (seasonal averages high 71 low 47)

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Eugene-Springfield Pollen Count:

Grass………. High (124)

Trees………. Moderate (47)

Last Counted: 6/7/17

Data Courtesy of Oregon Allergy Associates.

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Forecast for Roseburg:

• Mostly cloudy with rain this AM, showers likely (70%) and much cooler this afternoon (0.25 in. of rain possible), a slight (20%) chance of evening showers and thunderstorms, a slight (20%) chance of showers late tonight (under 0.10 in. of rain possible),
• A slight (20%) chance of AM showers, showers likely (70%) with a slight (20%) chance of thunderstorms Friday afternoon (under 0.10 in. of rain possible) and evening, showers likely (70%) late at night (0.25 in. of rain possible),
• Mostly cloudy with AM showers, showers with a slight (20%) chance of thunderstorms and a bit cooler Saturday afternoon, then a slight (20%) chance of showers late Saturday night.
• highs 63-59 lows near 48.
• Cloudy and a bit warmer with a good (50%) chance of showers Sunday, mostly cloudy with a (40%) chance of showers Sunday night,
• Mostly cloudy with a slight (20%) chance of showers and a bit warmer Monday and in the evening, just mostly cloudy at night,
• Then partly cloudy and a bit warmer Tuesday through Wednesday.
• highs 62-72 lows 47-45. (seasonal averages high 74 low 51)

 

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

• Cloudy with rain this AM, a good (50%) chance of showers and a bit cooler this afternoon (0.10 in. of rain possible), mostly cloudy with a slight (20%) chance of coastal showers tonight while a slight (20%) chance of evening inland showers (under 0.10 in. of rain possible),
• Mostly cloudy with a good (50%) chance of AM showers, showers likely (70%) with a slight (20%) chance of thunderstorms and a bit cooler Friday afternoon (0.25 in. of rain possible), coastal showers likely (70%) at night while a good (50%) chance of inland evening showers and inland showers likely (70%) late Friday night (0.10 in. of rain possible),
• Mostly cloudy with showers likely (70%) Saturday AM, showers likely (70%) with a slight (20%) chance of thunderstorms and a bit cooler Saturday afternoon, then cloudy with a (40%) chance of showers late at night.
• highs 69-60 lows near 50.
• Mostly cloudy with (40%) chance of showers and a bit warmer Sunday and Sunday night,
• A slight (20%) chance of showers Monday and in the evening, mostly cloudy late at night,
• Mostly cloudy Tuesday morning, then partly cloudy and a bit warmer in the afternoon through Wednesday.
• highs 58-60 lows near 48. (seasonal averages high 61 low 50)

 

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Forecast for the Cascades in Lane County:

• Cloudy with rain this AM, much cooler with showers this afternoon (0.25 in. of rain possible), a (40%) chance of showers and colder late tonight (0.10 in. of rain possible),
• A mix of clouds and sun with a slight (20%) of rain and snow showers Friday AM, rain and snow showers with a slight (20%) chance of thunderstorms and a bit cooler in the afternoon and evening, rain and snow showers likely (70%) late Friday night,
• AM rain and snow showers, mostly cloudy and a bit cooler with rain and snow showers and a slight (20%) chance of thunderstorms Saturday afternoon and in the evening, then a good (50%) chance of rain and snow showers late at night.
• snow level above 8,000 ft. falling to 7,000 ft. this afternoon, 7,000 ft. falling to 6,000 ft. late tonight, 5,500 ft. Friday, 5,000 ft. Friday night and Saturday, then 4,500 ft. Saturday night.
• highs 50-42 lows 36-32.
• Mostly cloudy with a good (50%) chance of rain and snow showers and a bit warmer Sunday and in the evening, a (30%) chance of showers late Sunday night,
• Cloudy with a slight (20%) chance of showers Monday AM, a mix of clouds and sun and a bit warmer with a slight (20%) chance of showers in the afternoon through Tuesday AM, a mix of clouds and sun and a bit warmer in the afternoon, partly cloudy Tuesday night,
• Mostly sunny in the AM, then partly cloudy and a bit warmer Wednesday afternoon.
• snow level 4,500 ft. Sunday, 5,000 ft. Sunday night, 6,000 ft. rising to above 8,000 ft. Monday afternoon, above 8,000 ft. Monday falling  to 7,000 ft. late Monday night, 7,000 ft. Tuesday AM, free air freezing level 9,000 ft. Tuesday afternoon, 9,000 ft. falling to 8,000 ft. Tuesday night, then 8,000 ft. rising to 9,000 ft. Wednesday afternoon.
• highs 43-62 lows 32-34 cooling back to 32 Tuesday night.

 

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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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