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 the frontal system that moved through 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 6 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 0 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 a slight (20%) chance of showers tonight (under 0.10 in. of rain possible),
• Cloudy with a (30%) chance of showers Friday AM, showers with a slight (20%) chance of thunderstorms and a bit cooler in the afternoon (0.25 in. of rain possible, more in storms), showers likely (70%) with a slight (20%) chance of thunderstorms in the evening, showers likely (70%) late Friday night (0.25 in. of rain possible, more in storms) and Saturday AM, showers likely (70%) with a slight (20%) chance of thunderstorms and a bit warmer in the afternoon (0.25 in. of rain possible) and evening, a good (50%) chance of showers late Saturday night (0.10 in. of rain possible),
• Then mostly cloudy with a slight (20%) chance of showers and a bit warmer Sunday and at night.
• lows 47-45 warming back to 47 Sunday night highs 59-67.
• Mostly cloudy with a slight (20%) chance of showers and a bit cooler Monday and Monday 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, mostly sunny and a bit warmer Wednesday afternoon, mostly clear at night,
• Then mostly sunny and a bit warmer Thursday.
• highs 64-72 lows 47-44. (seasonal averages high 71 low 47)

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Eugene-Springfield Pollen Count:

Grass………. High (51)

Trees………. Moderate (72)

Last Counted: 6/8/17

Data Courtesy of Oregon Allergy Associates.

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Forecast for Roseburg:

• Mostly cloudy with a (30%) chance of evening showers and a slight (20%) chance of thunderstorms, a slight (20%) chance of showers late tonight (under 0.10 in. of rain possible),
• Cloudy with a slight (30%) chance of AM showers, showers likely (70%) with a slight (20%) chance of thunderstorms Friday afternoon (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 likely (70%), showers with a slight (20%) chance of thunderstorms and a bit cooler Saturday afternoon (0.25 in. of rain possible) and evening, cloudy with a good (50%) chance of showers late Saturday night (0.25 in. of rain possible),
• Mostly cloudy and a bit warmer with a showers likely (70%) Sunday, mostly cloudy with a (40%) chance of showers Sunday night.
• lows near 48 highs 62-57 warming to 62 Sunday.
• Mostly cloudy with a (30%) chance of showers Monday and in the evening, just mostly cloudy at night and Tuesday, partly cloudy and a bit warmer Tuesday night through Wednesday night,
• Partly cloudy Thursday AM, then mostly sunny and a bit warmer in the afternoon.
• highs 65-75 lows near 45. (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 a slight (20%) chance of coastal showers tonight while a slight (20%) chance of evening inland showers (under 0.10 in. of rain possible),
• AM coastal showers while a good (50%) chance of AM inland showers, showers likely (70%) Friday afternoon (0.25 in. of rain possible) and evening, showers late Friday night (0.25 in. of rain possible),
• Mostly cloudy with AM coastal showers while inland AM showers likely (70%), showers with a slight (20%) chance of thunderstorms Saturday afternoon (0.50 in. of rain possible), cloudy with a good (50%) chance of coastal showers while a (40%) chance of inland showers with a slight (20%) chance of thunderstorms showers in the evening, a good (50%) chance of showers late at night (under 0.10 in. of rain possible),
• Mostly cloudy with AM showers likely (70%), then a (40%) chance of showers and a bit warmer Sunday and Sunday night.
• lows 50-48 warming back to 50 Sunday night highs near 58.
• Mostly cloudy with a slight (20%) chance of showers Monday and in the evening, just mostly cloudy late at night,
• Mostly cloudy a bit warmer Tuesday, then partly cloudy and a bit warmer Tuesday night through Thursday.
• highs 59-63 lows 50-47 warming back to 50 Wednesday night. (seasonal averages high 61 low 50)

 

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Forecast for the Cascades in Lane County:

• Cloudy with a (30%) chance of evening showers, partly cloudy and colder with a slight (20%) chance of showers 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 (0.25 in. of rain possible), rain and snow showers likely (70%) with a slight (20%) chance of thunderstorms in the evening, rain and snow showers likely (70%) late Friday night (0.25 in. of rain possible, 2 in. of snow possible),
• 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, rain and snow showers late at night,
• Cloudy Sunday with a AM rain and snow showers, a good (50%) chance of rain and snow showers and a bit warmer in the afternoon, a (40%) chance of evening showers, then a (30%) chance of rain and snow showers late Sunday night.
• snow level 7,000 ft. falling to 6,000 ft. late tonight, 5,500 ft. Friday, 5,000 ft. Friday night through Sunday, then 5,500 ft. Sunday night.
• lows 36-32 highs 50-44.
• Cloudy with a good (50%) 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 with a slight (20%) chance of showers in the afternoon, just partly cloudy Tuesday night,
• Partly cloudy in the AM, mostly sunny and a bit warmer Wednesday afternoon, partly cloudy at night and Thursday AM, then mostly sunny and a bit warmer Thursday.
• snow level 5,500 ft. rising to 7,000 ft. Monday afternoon, 6,000 ft. Monday night and Tuesday, free air freezing level 7,500 ft. falling to 6,000 ft. late Tuesday night, 6,000 ft. rising to 9,000 ft. Wednesday afternoon, then 9,000 ft. Wednesday night and Thursday.
• highs 43-64 lows 35-37.

 

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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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