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 approaching Oregon. An Upper Level Low Pressure Trough  (Shaded “U” shape with blue arrows) takes over enhancing rain chances. The graphics for days 3-7 show the frontal system that will have moved past the Pacific Northwest.

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Air Quality Index:

Eugene-Springfield: The Air Quality Index is 15 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 9 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 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 and a bit cooler today, a slight (20%) chance of evening showers, becoming mostly cloudy with rain late tonight (0.25 in. of rain possible) and Thursday AM, showers likely (70%) and cooler in the afternoon (0.25 in. of rain possible), a good (50%) chance of evening showers, a slight (20%) chance of showers and cooler late Thursday night (under 0.10 in. of rain possible),
• Partly cloudy with a slight (20%) chance of showers Friday AM, mostly cloudy with showers likely (70%) and a slight (20%) chance of thunderstorms and a bit cooler in the afternoon and evening, then showers likely (70%) late Friday night.
• highs 76-62 lows 56-47.
• Mostly cloudy with showers likely (70%) and a bit cooler Saturday, cloudy with showers likely (70%) in the evening, a good (50%) chance of showers late Saturday night,
• Mostly cloudy with a (40%) chance of showers Sunday AM, a slight (20%) chance of showers and a bit warmer in the afternoon and at night,
• A mix of clouds and sun and a bit warmer with a slight (20%) chance of showers Monday, partly cloudy with a slight (20%) chance of showers in the evening, just partly cloudy late Monday night,
• Then a mix of clouds and sun and a bit warmer Tuesday.
• highs 62-68 lows 46-44. (seasonal averages high 71 low 46)

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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:

• Partly cloudy with patchy fog this AM, becoming mostly cloudy and a bit cooler this afternoon, a (40%) chance of evening rain with a slight (20%) chance of thunderstorms, rain late tonight (0.25 in. of rain possible),
• Mostly cloudy with AM rain, a good (50%) chance of showers and cooler Thursday afternoon (0.25 in. of rain possible), a slight (20%) chance of showers late Thursday night (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 and evening, then rain late Friday night.
• highs 83-62 lows 57-47.
• Mostly cloudy with showers and a bit cooler Saturday and in the evening, a good (50%) chance of showers at night,
• Mostly cloudy and a bit warmer with a (30%) chance of showers Sunday, a slight (20%) chance of showers Sunday night,
• Mostly cloudy with a slight (20%) chance of showers Monday AM, partly cloudy and a bit warmer with a slight (20%) chance of showers in the afternoon and evening, just mostly cloudy Monday night,
• Mostly cloudy Tuesday AM, then partly cloudy in the afternoon.
• highs 59-72 lows near 45. (seasonal averages high 74 low 50)

 

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

• Partly cloudy with patchy fog this AM, mostly cloudy with a slight (20%) chance of rain and a bit warmer this afternoon (under 0.10 in. of rain possible), coastal rain tonight while a (40%) chance of  inland evening with inland rain late tonight (0.50 in. of rain possible),
• Cloudy with rain Thursday AM, a good (50%) chance of showers and a bit cooler Thursday afternoon (0.25 in. of rain possible), mostly cloudy with a slight (20%) chance of showers late Thursday night (under 0.10 in. of rain possible),
• Mostly cloudy with a good (50%) chance of AM showers, rain likely (70%) with a slight (20%) chance of thunderstorms and a bit cooler Friday afternoon, then rain likely (70%) at night.
• highs 69-60 lows 55-50.
• Mostly cloudy with AM rain, showers and a bit cooler Saturday afternoon and evening, slight (20%) chance of showers late Saturday night through Sunday night (a bit  warmer Sunday),
• Mostly cloudy with a slight (20%) chance of showers Monday AM, partly cloudy and a bit warmer with a slight (20%) chance of showers Monday afternoon and evening, mostly cloudy with a slight (20%) chance of showers late at night and Tuesday afternoon.
• highs 58-60 lows near 48. (seasonal averages high 61 low 50)

 

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Forecast for the Cascades in Lane County:

• Partly cloudy with a slight (20%) chance of  showers and thunderstorms and a bit cooler this afternoon, becoming cloudy a good (50%) chance of evening showers and a slight (20%) chance of thunderstorms, rain late tonight (0.25 in. of rain possible, more in storms),
• Mostly cloudy with rain Thursday AM, cooler with showers in the afternoon, showers likely (70%) and colder late at night,
• Mostly cloudy with showers likely (70%) Friday AM, a bit cooler with rain and snow showers likely (70%) and a slight (20%) chance of thunderstorms in the afternoon and evening, rain and snow showers likely (70%) Friday night.
• snow level above 8,000 ft. today and tonight, above 8,000 ft. falling to 7,500 ft. Thursday afternoon, 7,5000 ft. falling to 6,500 ft. late Thursday night, 6,500 ft. falling to 5,500 ft. Friday afternoon, then 5,000 ft. Friday night.
• highs 72-48 lows 46-33.
• Mostly cloudy and a bit cooler with rain and snow showers Saturday and in the evening, cloudy with a good (50%) chance of rain and snow showers late Saturday night,
• Mostly cloudy with a good (50%) chance of rain and snow showers and a bit warmer Sunday, a (40%) chance of evening rain and snow showers, a slight (20%) chance of rain and snow showers late Sunday night,
• Partly cloudy and a bit warmer with a slight (20%) chance of rain and snow showers Monday and in the evening, then just partly cloudy and a bit warmer Monday night and Tuesday.
• snow level 5,000 ft. Saturday, 4,500 ft. Saturday night and Sunday, 5,000 ft. Sunday night, 6,000 ft. rising to above 8,000 ft. Monday, 8,000 ft. Monday evening, free air freezing level 7,000 ft. late Monday night, then 7,000 ft. rising to 10,000 ft. Tuesday afternoon.
• highs 42-59 lows 30-34.

 

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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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