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Check out my latest Eugene Daily News Weather Or Not Column They Don’t Always Obey The Rules.

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And don’t forget my latest feature story in the continuing series on service club organizations called This Moose Isn’t Named Bullwinkle.

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And my feature article about Contractors Electric called Is The Ground Wire The White One Or The Black One?

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Here is my new weekly weather quiz question. What is a “temperature inversion?”  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.

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An upper level low pressure trough has been controlling our weather and will continue to do so for the workweek. There may be enough instability in the atmosphere to build up a thunderstorm or two. Today is the 35th anniversary of the great eruption of Mt. St. Helens at 8:30 AM on this date in 1980.

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Air Quality Index:

Eugene-Springfield: The Air Quality Index is 31 in the Good category measuring Particulate Matter.

Oakridge: The Air Quality Index is 16 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 23 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 DETROIT LAKE LOCATED 46 MILES SOUTHEAST OF SALEM ON THE NORTH SANTIAM RIVER IN LINN AND MARION COUNTIES. WATER MONITORING HAS CONFIRMED THE PRESENCE OF BLUE-GREEN ALGAE AND THE TOXINS THEY PRODUCE. THESE TOXIN CONCENTRATIONS CAN BE HARMFUL TO HUMANS AND ANIMALS. SWALLOWING OR INHALING WATER DROPLETS, AS WELL AS SKIN CONTACT WITH WATER, SHOULD BE AVOIDED. DRINKING WATER DIRECTLY FROM DETROIT RESERVOIR IS ESPECIALLY DANGEROUS AS THESE TOXINS CANNOT BE REMOVED BY BOILING, FILTERING, OR TREATING THE WATER WITH CAMPING-STYLE FILTERS. AN ANNOUNCEMENT WILL BE MADE WHEN IT BECOMES SAFE TO USE THE WATER AGAIN.

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

• A mix of clouds and sun with a (40%) chance of showers and thunderstorms this afternoon (under 0.10 in. of rain possible, more in storms), a good (50%) chance of showers and a slight (20%) chance of thunderstorms this evening , a good (50%) chance of showers late tonight (0.10 in. of rain possible),
• Cloudy with a (40%) chance of showers Tuesday (under 0.10 in. of rain possible), mostly cloudy with a slight (20%) chance of showers   Tuesday night (under 0.10 in. of rain possible) and Wednesday afternoon, a (30%) chance of evening showers, then a slight (20%) chance of showers late at night.
• highs 74-67 warming to 70Wednesday lows 54-50.
• Mostly cloudy with a (30%) chance of showers Thursday, a slight (20%) chance of showers Thursday night,
• A mix of clouds and sun with a slight (20%) chance of showers Friday,   mostly cloudy Friday night,
• Then partly cloudy Saturday through Sunday.
• highs 68-72 lows 48-45. (seasonal averages high 68 low 44)
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Eugene-Springfield Pollen Count

Trees: Moderate- 21

Grass: Moderate- 10

Reading as of: 5/15/15

Data courtesy of Oregon Allergy Associates.

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Forecast for the Umpqua Basin including Roseburg:

• Mostly cloudy with a slight (20%) chance of AM showers, a (30%) chance of showers with a slight (20%) chance of thunderstorms this afternoon and evening (under 0.10 in. of rain possible), a (30%) chance of showers late tonight (0.15 in. of rain possible),
• Cloudy with a (30%) chance of showers Tuesday (under 0.10 in. of rain possible) and Tuesday night (under 0.10 in. of rain possible),
• Cloudy with a (30%) chance of showers Wednesday, mostly cloudy with a (30%) chance of showers and a slight (20%) chance of evening thunderstorms, then a slight (20%) chance of showers late Wednesday night.
• highs 70-64 warming to 68 Wednesday lows 52-54.
• Mostly cloudy with a (40%) chance of showers Thursday and at night,
• Mostly cloudy with a slight (20%) chance of showers Friday and Friday night,
• Partly cloudy with a slight (20%) chance of showers Saturday, then just partly cloudy Saturday night and Sunday.
• highs 72-74 lows 52-48. (seasonal averages high 71 low 48)
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Forecast for the South Oregon Coast including Coos Bay and North Bend:

• Mostly cloudy with a slight (20%) chance of showers today (under 0.10 in. of rain possible), a (30%) chance of showers tonight (under 0.10 in. of rain possible),
• Cloudy with a (30%) chance of showers Tuesday (under 0.10 in. of rain possible) and Tuesday night (under 0.10 in. of rain possible),
• Mostly cloudy with a slight (20%) chance of showers Wednesday and at night.
• highs near 58 lows near 52.
• Cloudy with a slight (20%) chance of showers Thursday, mostly cloudy with a slight (20%) chance of showers Thursday night,
• Just mostly cloudy Friday and Friday night,
• Then partly cloudy Saturday through Sunday.
• highs near 60 lows 52-49. (seasonal averages high 59 low 47)

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Forecast for the Cascades in Lane County:

• Mostly cloudy with a good (50%) chance of AM showers, showers and thunderstorms likely (70%) this afternoon and evening (0.25 in. of rain possible, more in storms), showers likely (70%) late tonight,
• Cloudy with AM showers likely (70%), a good (50%) chance of showers and thunderstorms Tuesday afternoon and evening, a slight (20%) chance of showers late at night,
• Cloudy with a good (50%) chance of showers Wednesday AM, showers likely (70%) and a good (50%) chance of thunderstorms in the afternoon and evening, a good (50%) chance of showers late Wednesday night.
• snow level above 8,000 ft. today through Wednesday night.
• highs 62-56 warming to 58 Wednesday lows 42-38.
• Cloudy with a good (50%) chance of showers Thursday with a slight (20%) chance of thunderstorms in the afternoon and evening, mostly cloudy with a (40%) chance of showers Thursday night,
• Mostly cloudy with a (40%) chance of showers Friday, a slight (20%) chance of showers at night,
• A mix of clouds and sun with a slight (20%) chance of showers Saturday, partly cloudy with a slight (20%) chance of showers Saturday night,
• Then a mix of clouds and sun with a slight (20%) chance of showers Sunday.
• snow level above 8,000 ft. Thursday through Sunday.
• highs 55-57 lows 39-36.

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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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