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 7 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 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 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, possible sun peeks, and a bit warmer with a slight (20%) chance isolated showers this afternoon (under 0.10 in. of rain possible), mostly cloudy tonight and Wednesday AM, a mix of clouds and sun and a bit warmer Wednesday, becoming mostly cloudy with a slight (20%) chance of rain late Wednesday night (under 0.10 in. of rain possible),
• Cloudy with a good (50%) chance of AM rain, rain likely (70%) and a bit cooler Thursday afternoon and evening (under 0.10 in. of rain possible), windy (Wind: S 5-15 mph increasing to S 15-25 mph gusts to 35 mph I’m the afternoon), then showers likely (70%) late Thursday night.
• highs 63-72 cooling to 67 Thursday lows 44-55.
• Mostly cloudy and a bit warmer with a good (50%) chance of rain Friday, a slight (20%) chance of evening showers, just mostly cloudy late Friday night,
• AM clouds,  partly cloudy and a bit warmer Saturday and at night,
• Then mostly sunny and a bit warmer Sunday and Monday, mostly clear Sunday night.
• highs 70-82 lows near 50. (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:

• Mostly cloudy and a bit warmer this afternoon, partly cloudy tonight,
• Mostly cloudy in the AM,  mostly sunny Wednesday afternoon, just mostly cloudy Wednesday night,
• Mostly cloudy  with a (30%) chance of rain Thursday afternoon (under 0.10 in. of rain possible), cloudy with a (40%) chance of rain Thursday night.
• highs 65-74 lows 47-56.
• Mostly cloudy with a (30%) chance of AM rain, a slight (20%) chance of showers Friday afternoon and in the evening, mostly cloudy late at night  and Saturday AM, sunny and a bit warmer Saturday afternoon, mostly clear Saturday night,
• Mostly sunny and a bit warmer Sunday and Monday, mostly clear Sunday night,
• highs 74-88 lows near 55. (seasonal averages high 75 low 51)

 

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

• Mostly cloudy and a bit cooler this afternoon, partly cloudy tonight,
• Mostly cloudy in the AM, mostly sunny and a bit warmer Wednesday afternoon, a slight (20%) chance of coastal rain late Wednesday night (under 0.10 in. of rain possible),
• Mostly cloudy with a good (50%) chance of AM coastal rain and rain likely (60%) and a bit warmer Thursday afternoon (0.10 in. of rain possible)while a (30%) chance of inland afternoon rain, cloudy with evening rain, then a good (50%) chance of rain late at night.
• highs 59-62 lows 49-55.
• Mostly cloudy with a (30%) chance of rain Friday AM, a bit cooler in the afternoon with a slight (20%) chance of showers, a slight (20%) chance of evening showers, just mostly cloudy late Friday night,
• Mostly cloudy Saturday AM, sunny and a bit warmer in the afternoon, mostly clear at night,
• Mostly sunny Sunday (a bit warmer) and Monday (a bit cooler), mostly clear Sunday night.
• highs 60-72 cooling to 66 Monday lows near 55. (seasonal averages high 61 low 50)

 

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Forecast for the Cascades in Lane County:

• Mostly cloudy and a bit warmer with a slight (20%) chance of isolated showers  this afternoon (under 0.10 in. of rain possible), just partly cloudy tonight,
• Partly cloudy and a bit warmer Wednesday, becoming mostly cloudy with a slight (20%) chance of rain late Wednesday night,
• Mostly cloudy with a slight (20%) chance of AM rain, rain and a bit cooler Thursday afternoon and evening, then showers late at night.
• snow level 8,000 ft. today, 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 Thursday night.
• highs 50-63 cooling to 60 Thursday lows 34-44.
• Mostly cloudy with rain likely (70%) Friday AM, a bit warmer with a (30%) chance of rain in the afternoon, a slight chance of evening showers, just partly cloudy late Friday night,
• Partly cloudy and a bit warmer Saturday and at night,
• Then mostly sunny and a bit warmer Sunday and Monday, mostly clear Sunday night.
• snow level above 8,000 ft. Friday and in the evening, free air freezing level 12,000 ft.late Friday night,  12,000 ft. rising to 14,000 ft. Saturday afternoon, 14,000 ft. rising to 15,000 ft. Saturday night, 15,000 ft. rising to 16,000 ft. Sunday, then 16,000 ft. Sunday night and Monday.
• highs 62-79 lows 42-44.

 

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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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