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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 30 in the Good category measuring Ozone.

Oakridge: The Air Quality Index is 20 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 32 in the Good category measuring Ozone.

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:

• Cloudy with showers likely (70%) and a slight (20%) chance of isolated thunderstorms this evening, scattered showers likely (70%) late tonight (0.10 in. of rain possible),
• Cloudy with a slight (20%) chance of AM showers, mostly cloudy with a (40%) chance of showers Tuesday afternoon (under 0.10 in. of rain possible), cloudy with a slight (20%) chance of showers at night (under 0.10 in. of rain possible),
• Mostly cloudy with a slight (20%) chance of showers Wednesday (under 0.10 in. of rain possible), cloudy with a (40%) chance of showers Wednesday night (under 0.10 in. of rain possible),
• Cloudy with a (30%) chance of showers Thursday, mostly cloudy with a slight (20%) chance of showers Thursday night.
• lows 53-50 highs 67-70 cooling back to 67 Thursday.
• Mostly cloudy with a slight (20%) chance of showers Friday, just  mostly cloudy Friday night,
• Then partly cloudy Saturday through Monday.
• highs near 70 lows near 46. (seasonal averages high 68 low 44)
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Eugene-Springfield Pollen Count

Trees: Moderate- 40

Grass: Moderate- 9

Reading as of: 5/16/15

Data courtesy of Oregon Allergy Associates.

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Forecast for the Umpqua Basin including Roseburg:

• Cloudy with a (30%) chance of scattered showers and thunderstorms this evening, a (30%) chance of scattered showers tonight (0.15 in. of rain possible) and Tuesday (under 0.10 in. of rain possible) and Tuesday night (under 0.10 in. of rain possible),
• Cloudy with a good (50%) chance of showers Wednesday (under 0.10 in. of rain possible), mostly cloudy with a (30%) chance of showers and a slight (20%) chance of evening thunderstorms, a slight (20%) chance of showers late Wednesday night (under 0.10 in. of rain possible),
• Cloudy with a (40%) chance of showers Thursday, mostly cloudy with a (30%) chance of showers at night.
• lows 50-52 highs 65-70.
• Mostly cloudy with a slight (20%) chance of showers Friday, just mostly cloudy Friday night,
• Partly cloudy Saturday through Sunday night,
• Then partly cloudy with a slight (20%) chance of showers Monday (Memorial Day).
• highs near 73 lows 47-44 warming back to 47 Sunday night. (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 (30%) chance of scattered coastal showers tonight while a (30%) chance of scattered showers and isolated thunderstorms inland this evening and a (30%) chance of shattered showers scattered showers inland late tonight (under 0.10 in. of rain possible),
• Cloudy with a (30%) chance of showers Tuesday (under 0.10 in. of rain possible) and Wednesday (under 0.10 in. of rain possible), a slight (20%) chance of showers Tuesday night (under 0.10 in. of rain possible) and Wednesday night (under 0.10 in. of rain possible),
• Cloudy with a slight (20%) chance of showers Thursday, then mostly cloudy with a slight (20%) chance of showers Thursday night.
• lows 50-52 highs 57-60.
• Just mostly cloudy Friday and Friday night,
• Then partly cloudy Saturday through Monday (Memorial Day).
• highs near 60 lows 48. (seasonal averages high 59 low 47)

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Forecast for the Cascades in Lane County:

• Mostly cloudy with showers and scattered thunderstorms this evening, increasing showers late tonight (0.25 in. of rain possible, more in storms),
• Cloudy with a good (50%) chance of AM showers, showers likely (70%) with a slight (20%) chance of thunderstorms Tuesday afternoon and evening (0.10 in. of rain possible, more in storms), a slight (20%) chance of showers late at night (under 0.10 in. of rain possible),
• Showers likely (70%) Wednesday AM, showers likely (70%) with a slight (20%) chance of thunderstorms in the afternoon and evening, a good (50%) chance of showers late Wednesday night,
• Cloudy with a good (50%) chance of showers Thursday AM, a good (50%) chance of showers with a slight (20%) chance of thunderstorms in the afternoon and evening, mostly cloudy with a (40%) chance of showers Thursday night.
• snow level above 8,000 ft. tonight through Thursday night.
• lows near 42 highs 56-60 cooling back to 56 Thursday.
• 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, Sunday, and Monday (Memorial Day), partly cloudy with a slight (20%) chance of showers each night.
• snow level above 8,000 ft. Friday through Monday.
• highs near 56 lows 35-37.

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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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