Here is my weekly weather quiz question. What is a “Stilling Basin?”  Please remember to post your answer as a comment by clicking on “no comments /comments” in the upper right hand portion of this page under the caption, then add your comment. The first person to post the correct answer will win a week of free personalized weather forecasts tailored to your needs. The answer has to be a comment to win. An email answer will not count. Good luck.

________________

A weakening area of High Pressure (Shaded “Arch” shape with blue arrows) keept us dry and in sunshine again today.  Upper level Low Pressure (Shaded “U” shape with blue arrows) gives us the impetus for a change in our weather pattern. A frontal system is shown approaching the coast on Friday. There’s another cause for increased rain chances. Take a look at the frontal system that will be moving through the Pacific Northwest a week from today. The 2016 Olympic Team Trials that run through next Sunday July 10th at Hayward Field will encounter at least a chance of showers, as you can see in the forecast, from Thursday through the rest of the trials.

________________

Air Quality Index:

Eugene-Springfield: The Air Quality Index is 41in the good category measuring Ozone.

Oakridge: The Air Quality Index is 10 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 38 in the Good category measuring Ozone.

Data courtesy of Lane Regional Air Protection Agency (LRAPA).

________________

 

Advisories:

• A Blue-Green Algae health advisory is in effect issued for Howard Bay (sometimes called Howards Bay or Howard’s Bay) in Upper Klamath Lake. 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 Blue-Green Algae health advisory has been issued for the Metolius Arm of Lake Billy Chinook from Perry South Campground to and including the area around Three Rivers Marina, located about 12 miles Southwest of Madras in Jefferson County.   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.

________________

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

• Partly cloudy this evening, mostly cloudy late tonight,
• Cloudy Thursday and a bit cooler with a (40%) chance of rain in the afternoon, a good (50%) chance of rain Thursday night,
• Mostly cloudy with rain likely (70%) Friday AM, showers likely (70%) and a bit cooler in the afternoon, cloudy with a good (50%) chance of showers Friday night,
• Cloudy with AM showers likely (70%), a good (50%) chance of showers Saturday afternoon, evening showers likely (70%), then a good (50%) chance of showers late Saturday night.
• lows 52-56 cooling back to 52 Saturday night highs 77-68.
• Mostly cloudy with a good (50%) chance of showers and a bit warmer Sunday, a (30%) chance of showers in the evening, partly cloudy late at Sunday night,
• A mix of clouds and sun and a bit warmer Monday, partly cloudy with a slight (20%) chance of showers late Monday night,
• A mix of clouds and sun with a slight (20%) chance of showers Tuesday and in the evening, then just partly cloudy late Tuesday night and Wednesday (a bit warmer).
• highs 70-77 lows near 50. (seasonal averages high 80 low 51)

 

_____

Eugene-Springfield Pollen Count:

Grass………. High (30)

Trees………. Low (5)

Last Counted: 7/5/16

Data Courtesy of Oregon Allergy Associates.

___________________

Forecast for Roseburg:

• Mostly clear tonight,
• Sunny Thursday AM, then mostly cloudy in the afternoon, cloudy with a good (50%) chance of showers at night,
• AM showers likely (70%), cooler with a (40%) chance of showers Friday afternoon and Friday night,
• Mostly cloudy with a (40%) chance of showers and a bit warmer Saturday, cloudy with a (40%) chance of showers at night.
• lows 55-59 cooling to 54 Friday night and Saturday night highs 82-68.
• Mostly cloudy with a (30%) chance of showers Sunday, mostly cloudy in the evening, partly cloudy late Sunday night,
• Partly cloudy with a slight (20%) chance of showers Monday AM, partly cloudy and a bit warmer in the afternoon and Monday night,
• Partly cloudy with a slight (20%) chance of showers Tuesday, partly cloudy in the evening, mostly clear at night,
• Then sunny Wednesday.
• highs 72-80 lows near 53. (seasonal averages high 82 low 55)

 

________________

 

 

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

• Partly cloudy this evening, mostly cloudy late tonight,
• Mostly cloudy Thursday with patchy AM coastal fog and drizzle, a slight (20%) chance of showers in the afternoon, cloudy with a (30%) chance of evening showers, showers likely (70%) Thursday night and Friday AM, a good (50%) chance of afternoon showers, a (40%) chance of showers Friday night,
• Then mostly cloudy with a (40%) chance of showers Saturday and Saturday night.
• lows near 54-57 cooling to 55 Friday night and Saturday night highs 63-60.
• Mostly cloudy with a (30%) chance of showers Sunday, mostly cloudy in the evening, just partly cloudy late Sunday night,
• Mostly cloudy Monday AM, partly cloudy in the afternoon, partly cloudy with a slight (20%) chance of showers late Monday night and Tuesday, then just partly cloudy Tuesday night and Wednesday.
• highs 63-65 lows 50-54. (seasonal averages high 64 low 52)

 

________________

 

Forecast for the Cascades in Lane County:

• Partly cloudy tonight,
• Partly cloudy and a bit warmer with a slight (20%) chance of rain Thursday afternoon, cloudy with a good (50%) chance of evening rain, rain likely (70%) late Thursday night and Friday AM, cooler with showers likely (60%) Friday afternoon and Friday night,
• Then showers likely (70%) and a bit cooler Saturday and Saturday night.
• free air freezing level 13,000 ft. rising to 14,000 ft. late tonight, snow level above 8,000 ft. Thursday through Friday night, 7,500 ft. Saturday, then 7,000 ft. late Saturday night.
• lows 42-45 cooling to 38 Saturday night highs 68-49.
• Mostly cloudy with showers likely (70%) Sunday AM, a mix of clouds and sun with a good (50%) chance of showers and a bit warmer Sunday afternoon, mostly cloudy with a (30%) chance of showers in the evening, just partly cloudy late Sunday night and Monday, partly cloudy with a slight (20%) chance of showers late Monday night,
• A mix of clouds and sun and a bit cooler Tuesday with a slight (20%) chance of showers, partly cloudy with a slight (20%) chance of evening showers, then just partly cloudy late Tuesday night and Wednesday (a bit warmer).
• snow level 7,000 ft. Sunday, 7,500 ft. Sunday night, free air freezing level 9,000 ft. rising to 11,000 ft. late Sunday night, 9,000 ft. rising to 11,000 ft. Monday, snow level above 8,000 ft. Monday night through Tuesday evening, then free air freezing level 12,000 ft. late Tuesday night and Wednesday.
• highs 57-66 lows 37-40.

________________

 

**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.

________________