Here is my weekly weather quiz question. What is  a “Back Building Thunderstorm?” 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 as it slides eastward keeping us in the moist westerly airflow. The graphics for days 1-3 show a new frontal system approaching the  Oregon coast Wednesday. The graphics for days 3-7 show frontal systems approaching the coast Saturday and next Tuesday.

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Air Quality Index:

Eugene-Springfield: The Air Quality Index is 5 in the Good category measuring Particulate Matter.

Oakridge: The Air Quality Index is 10 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 South Tenmile Lake, located 10 miles north of North Bend in Coos County. Visual inspection indicates a blue-green algae bloom is present in the Coleman Arm of South Tenmile Lake, and Oregon Department of Environmental Quality is collecting and analyzing samples to confirm whether or not associated toxins are also present. If present, these toxins 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. Drinking water directly from South Tenmile Lake at this time is especially dangerous. Oregon public health officials advise campers and other recreational visitors that toxins cannot be removed by boiling, filtering or treating water with camping-style filters.
• 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 tonight and Wednesday AM, a mix of clouds and sun and a bit warmer in the afternoon, becoming mostly cloudy with a slight (20%) chance of rain late Wednesday night (under 0.10 in. of rain possible),
• Mostly cloudy with a good (50%) chance of AM rain, rain and a bit cooler Thursday afternoon (0.10 in. of rain possible) and breezy (Wind: S 5-10 mph increasing to S 15-25 mph afternoon gusts to 35 mph), evening rain, showers likely (70%) late Thursday night (0.25 in. of rain possible),
• Cloudy and a bit warmer with a good (50%) chance of rain Friday, a slight (20%) chance of evening showers, then just mostly cloudy late Friday night.
• lows 44-56 cooling to 50 Friday night highs 72-67 warming to 70 Friday.
• AM clouds, partly cloudy and a bit warmer Saturday and at night,
• Then mostly sunny and a bit warmer Sunday, Monday, and Tuesday, mostly clear each night,
• highs 75-82 lows 52-54. (seasonal averages high 72 low 47)

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Eugene-Springfield Pollen Count:

Grass………. Moderate (17)

Trees………. Moderate (25)

Last Counted: 6/13/17

Data Courtesy of Oregon Allergy Associates.

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Forecast for Roseburg:

• Partly cloudy tonight,
• Mostly cloudy in the AM, partly cloudy Wednesday afternoon, just mostly cloudy at night,
• Cloudy  with a slight (20%) chance of rain Thursday (under 0.10 in. of rain possible), a (30%) chance of rain Thursday night (under 0.10 in. of rain possible),
• Cloudy with a (30%) chance of rain Friday, mostly cloudy with a slight (20%) chance of showers in the evening, then mostly cloudy late at night.
• lows 47-56 highs 74-70.
• Mostly cloudy Saturday AM, sunny and a bit warmer in the afternoon, clear Saturday night,
• Sunny and a bit warmer Sunday, Monday, and Tuesday, mostly clear at night,
• highs 82-87 cooling to 83 Tuesday lows 56-59. (seasonal averages high 75 low 51)

 

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

• Partly cloudy tonight,
• Mostly cloudy in the AM, partly cloudy and a bit warmer Wednesday afternoon, mostly cloudy at night,
• Mostly cloudy with a good (50%) chance of AM coastal rain with rain Thursday afternoon while a (40%) of inland rain and a bit warmer Thursday afternoon (0.25 in. of rain possible), evening rain, a good (50%) chance of rain late at night (0.25 in. of rain possible),
• Cloudy with a (30%) chance of rain Friday, mostly cloudy with a slight (20%) chance of evening showers, then just mostly cloudy late Friday night.
• lows 48-55 highs 60-63.
• Mostly cloudy Saturday AM, sunny and a bit warmer in the afternoon, clear Saturday night,
• Sunny Sunday and a bit warmer, mostly clear at night,
• Mostly sunny and a bit cooler Monday and Tuesday, mostly clear Monday night,
• highs 64-72 cooling to 68 Monday and Tuesday lows 55-57. (seasonal averages high 61 low 50)

 

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Forecast for the Cascades in Lane County:

• Partly cloudy tonight,
• Partly cloudy and a bit warmer Wednesday, becoming mostly cloudy with a slight (20%) chance of rain late Wednesday night,
• Cloudy with a slight (20%) chance of AM rain, rain and a bit cooler Thursday afternoon and evening, showers late at night,
• Mostly cloudy with rain likely (70%) Friday AM, a bit cooler with a (30%) chance of rain in the afternoon, a slight chance of evening showers, just partly cloudy late Friday night.
• free air freezing level 9,000 ft. tonight, 9,000 ft. rising to 10,000 ft. Wednesday afternoon, snow level above 8,000 ft. Wednesday night through Friday evening, free air freezing level 13,000 ft. late Friday night.
• lows 34-45 cooling to 43 Friday night highs 64-58.
• Partly cloudy and a bit warmer Saturday and at night,
• Then mostly sunny and a bit warmer Sunday, Monday, and Tuesday (a bit cooler), mostly clear each night.
• free air freezing level 13,000 ft. rising to 15,000 ft. Saturday afternoon, 15,000 ft. rising to 16,000 ft. Saturday night, then 16,000 ft. Sunday through Tuesday.
• highs 66-77 cooling to 72 Tuesday lows 45-48.

 

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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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