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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. The chance of showers will continue even though it will be quite low.

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Air Quality Index:

Eugene-Springfield: The Air Quality Index is 25 in the Good category measuring Particulate Matter.

Oakridge: The Air Quality Index is 29 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 30 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:

• Mostly cloudy with slight (20%) chance of morning showers, a (40%) chance of showers late this afternoon, showers with a slight (20%) chance of thunderstorms this evening (under 0.10 in. of rain possible, more in storms), a good (50%) chance of showers late tonight (0.10 in. of rain possible),
• Cloudy with a slight (20%) chance of showers Thursday (under 0.10 in. of rain possible), mostly cloudy with a slight (20%) chance of showers Thursday night (under 0.10 in. of rain possible),
• A slight (20%) chance of drizzle Friday AM, then just mostly cloudy in the afternoon, partly cloudy Friday night.
• highs 70-68 lows 55-47.
• A mix of clouds and sun Saturday and Sunday, partly cloudy both nights,
• Partly cloudy and warmer Monday (Memorial Day) and Monday night,
• Then a mix of clouds and sun and a bit cooler Tuesday.
• highs 67-74 cooling to 70 Tuesday lows 45-49. (seasonal averages high 68 low 44)
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Eugene-Springfield Pollen Count

Trees: Moderate- 65

Grass: High- 49

Reading as of: 5/19/15

Data courtesy of Oregon Allergy Associates.

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Forecast for the Umpqua Basin including Roseburg:

• Cloudy with a (40%) chance of showers this AM, showers with a slight (20%) chance of isolated thunderstorms this afternoon and evening (under 0.10 in. of rain possible, more in storms), mostly cloudy with a slight (20%) chance of showers late tonight (under 0.10 in. of rain possible),
• Cloudy with a slight (20%) chance of showers Thursday AM, a good (50%) chance of showers with a slight (20%) chance of thunderstorms in the afternoon and evening (under 0.10 in. of rain possible), a slight (20%) chance of showers late Thursday night (under 0.10 in. of rain possible),
• Mostly cloudy with a slight (20%) chance of showers Friday, then just partly cloudy Friday night.
• highs near 72 lows 53-46.
• Partly cloudy Saturday through Monday (Memorial Day), mostly cloudy with a slight (20%) chance of showers in the evening, mostly cloudy Monday night,
• Then partly cloudy Tuesday.
• highs 70-75 cooling to 72 Friday lows near 46. (seasonal averages high 71 low 48)
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Forecast for the South Oregon Coast including Coos Bay and North Bend:

• Cloudy with isolated showers this afternoon (under 0.10 in. of rain possible), a (40%) chance of inland showers this evening, just cloudy late tonight,
• Cloudy with a slight (20%) chance of inland showers Thursday AM, a slight (20%) chance of inland showers and thunderstorms in the afternoon (under 0.10 in. of rain possible),  just mostly cloudy Thursday night,
• Mostly cloudy Friday, then just partly cloudy Friday night.
• highs 57-60 lows 53-48.
• Partly cloudy Saturday through Monday (Memorial Day), mostly cloudy Monday night,
• Then just partly cloudy Tuesday.
• highs 60-58 lows 48. (seasonal averages high 59 low 48)

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Forecast for the Cascades in Lane County:

• Cloudy with a slight (20%) chance of showers this AM, showers with a slight (20%) chance of thunderstorms this afternoon and evening (0.25 in. of rain possible), a good (50%) chance of showers late tonight (0.25 in. of rain possible, more in storms),
• Cloudy with a slight (20%) chance of AM showers, showers likely (70%) with a slight (20%) chance of thunderstorms Thursday afternoon and evening, a slight (20%) chance of showers late at night,
• Mostly cloudy with areas of AM drizzle, a (40%) chance of showers with a slight (20%) chance of thunderstorms Friday afternoon, mostly cloudy with a slight (20%) chance of showers evening showers, partly cloudy with a slight (20%) chance of showers Friday night.
• snow level above 8,000 ft. today through Friday night.
• highs near 56 lows 43-36.
• Partly cloudy with a slight (20%) chance of showers Saturday, partly cloudy Saturday night through Monday (Memorial Day), partly cloudy with a slight (20%) chance of showers Monday night,
• Then a mix of clouds and sun and cooler with a slight (20%) chance of showers Tuesday.
• snow level 7,500 ft. Saturday, free air freezing level 9,000 ft. Saturday night, snow level above 8,000 ft. Sunday, free air freezing level 10,000 ft. Sunday night and Monday, then snow level above 8,000 ft. Monday night and Tuesday.
• highs 53-60 cooling to 55 Tuesday lows 34-36.

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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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