Here is my new 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.

________________

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. The graphics for days 3-7 show frontal systems approaching the coast Friday and moving through the Pacific Northwest through the workweek.

________________

 

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)

__________________

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.

________________

Forecast for the Southern and lower Mid Willamette Valley including Eugene-Springfield and Albany-Corvallis:

• Mostly cloudy with a slight (20%) chance of evening showers, mostly cloudy late tonight,
• Areas of AM drizzle, mostly cloudy and a bit warmer Tuesday with a slight (20%) chance isolated afternoon showers (under 0.10 in. of rain possible), mostly cloudy at night,
• A mix of clouds and sun and a bit warmer Wednesday, partly cloudy in the evening, 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, evening rain likely (70%), then a good (50%) chance of showers late Thursday night.
• lows 48-44 warming back to 55 Thursday night highs 63-72 cooling to 67 Thursday.
• Mostly cloudy and a bit warmer with a good (50%) chance of showers Friday, a (30%) chance of evening showers, a slight (20%) chance of showers late Friday night,
• A mix of clouds and sun and a bit warmer Saturday, partly cloudy 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)

_____

 

Eugene-Springfield Pollen Count:

Grass………. High (177)

Trees………. Low (11)

Last Counted: 6/12/17

Data Courtesy of Oregon Allergy Associates.

_________________

 

Forecast for Roseburg:

• Mostly cloudy with a slight (20%) chance of showers tonight (under 0.10 in. of rain possible),
• Mostly cloudy and a bit warmer with a slight (20%) chance of showers Tuesday, partly cloudy Tuesday night,
• Mostly cloudy in the AM,  partly cloudy Wednesday afternoon, just mostly cloudy Wednesday night,
• Mostly cloudy  with a (30%) chance of rain Thursday afternoon and evening, cloudy with a (40%) chance of showers Thursday night.
• lows 48-58 highs 65-74.
• Mostly cloudy with a (30%) chance of showers Friday and in the evening, mostly cloudy late at night,
• Mostly cloudy in the 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)

 

_____________________

 

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

• Mostly cloudy with a slight (20%) chance of showers tonight (under 0.10 in. of rain possible),
• Mostly cloudy a bit warmer with a slight (20%) chance of showers Tuesday (under 0.10 in. of rain possible), partly cloudy at night,
• Mostly cloudy and a bit warmer Wednesday, a slight (20%) chance of showers late Wednesday night (under 0.10 in. of rain possible),
• Mostly cloudy and a bit warmer with a good (50%) chance of rain Thursday, cloudy with evening rain likely (60%), a good (50%) chance of rain late at night.
• lows 52-49 warming to 55 Thursday night highs 57-62.
• Mostly cloudy with a (30%) chance of rain Friday and a bit cooler in the afternoon, 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)

 

________________

 

Forecast for the Cascades in Lane County:

• Mostly cloudy with a good (50%) chance of showers tonight (0.10 in. of rain possible),
• Areas of drizzle Tuesday AM, a mix of clouds and sun and a bit warmer with a slight (20%) chance of isolated afternoon showers (under 0.10 in. of rain possible), just partly cloudy at night,
• Partly cloudy and a bit warmer Wednesday, becoming mostly cloudy with a slight (20%) chance of rain late Wednesday night,
• Mostly cloudy with a (30%) chance of AM rain, rain likely (70%) and a bit cooler Thursday afternoon, cloudy with evening rain likely (70%), a good (50%) chance of showers late at night.
• snow level above 7,000 ft. tonight, 7,500 ft. Tuesday, free air freezing level 10,000 ft. falling to 9,000 ft. Tuesday night, 8,000 ft. rising to 9,000 ft. Wednesday afternoon, snow level 8,000 ft. Wednesday night, then above 8,000 ft. Thursday and Thursday night.
• lows 34-44 highs 53-63 cooling to 60 Thursday.
• Mostly cloudy with a good (50%) chance of showers Friday AM, a bit warmer with a slight (20%) chance of showers in the afternoon, a (30%) chance of evening showers, just partly cloudy late Friday night through Saturday night,
• Then mostly sunny and a bit warmer Sunday and Monday, mostly clear Sunday night.
• snow level above 8,000 ft. Friday and Friday night, air freezing level 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 near 44.

 

________________

**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.

________________

Get your local Eugene-Springfield and Lane County news on-line at eugenedailynews.com.

_______________