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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The Jet Stream (Shaded area with blue arrows shown west to east into Oregon) hangs on to rain chances over the Pacific Northwest keeping us in the moist westerly airflow through this evening.  The graphics for days 1-3 show a new frontal system that moved into Oregon today. High pressure will take over giving us sunshine for the weekend. The graphics for days 3-7 more frontal systems headed for Oregon next week.

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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 20 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 3 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 and a bit warmer with rain at times this afternoon (0.25 in. of rain possible), a good (50%) chance of evening showers, just mostly cloudy late tonight,
• Mostly cloudy in the AM, partly cloudy and a bit warmer Saturday afternoon and at night,
• Mostly sunny and a bit warmer Sunday, then clear Sunday night.
• highs 67-83 lows 50-54.
• Mostly sunny Monday, Tuesday (a bit cooler), and Wednesday, mostly clear each night,
• Then sunny and a bit warmer Thursday.
• highs 84-80 warming to 83 Thursday lows 53-50. (seasonal averages high 73 low 48)

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Eugene-Springfield Pollen Count:

Grass………. Moderate (9)

Trees………. Moderate (85)

Last Counted: 6/16/17

Data Courtesy of Oregon Allergy Associates.

 

 

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Forecast for Roseburg:

• Cloudy with showers this afternoon (under 0.10 in. of rain possible), mostly cloudy with a (30%) chance of evening showers, a slight (20%) chance of rain tonight (under 0.10 in. of rain possible),
• Mostly cloudy Saturday AM, partly cloudy and a bit warmer in the afternoon and evening, clear late Saturday night,
• Sunny and a bit warmer Sunday, then clear Sunday night.
• highs 69-89 lows 52-58.
• Mostly sunny and a bit warmer Monday, mostly clear at night,
• Sunny and a bit warmer Tuesday, clear Tuesday night,
• Then sunny and a bit warmer Wednesday and Thursday, clear Wednesday night.
• highs 88-83 lows 58-54. (seasonal averages high 76 low 52)

 

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

• Cloudy with coastal showers likely (70%) this afternoon while a good (50%) chance of inland showers this afternoon (0.25 in. of rain possible), mostly cloudy with a slight (20%) chance of evening showers (under 0.10 in. of rain possible), just mostly cloudy late tonight and Saturday AM, partly cloudy and a bit warmer in the afternoon, mostly clear Saturday night,
• Sunny and a bit warmer Sunday, then mostly clear at night.
• highs 62-67 lows 53-55.
• Mostly sunny and a bit cooler Monday and Tuesday, mostly clear at night,
• Then sunny and a bit warmer Wednesday and Thursday, clear Wednesday night.
• highs 65-67 lows 55-52. (seasonal averages high 62 low 51)

 

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Forecast for the Cascades in Lane County:

• Mostly cloudy and a bit cooler with rain at times this afternoon, cloudy with evening showers likely (70%), a slight (20%) chance of showers late tonight (0.10 in. of rain possible),
• Partly cloudy and a bit warmer Saturday, mostly clear at night,
• Sunny and a bit warmer Sunday, then clear Sunday night.
• snow level above 8,000 ft. today and tonight, free air freezing level 13,000 ft. rising to 14,000 ft. Saturday, 15,000 ft. Saturday night, then 16,000 ft. Sunday and Sunday night.
• highs 52-78 lows 40-52.
• Sunny Monday, mostly clear at night,
• Mostly sunny and a bit cooler Tuesday and Wednesday, mostly clear both nights,
• Sunny and a bit warmer Thursday.
• free air freezing level 16,000 ft. Monday through Tuesday, 16,000 ft. falling to 15,000 ft. late Tuesday night, 15,000 ft. falling to 14,000 ft. Wednesday, 14,000 ft. rising to 15,000 ft. Wednesday night, then 15,000 ft. falling to 14,000 ft. Thursday.
• highs 78-74 warming back to 78 Thursday lows 47-43.

 

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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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