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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 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 46 in the Good category measuring Particulate Matter.

Oakridge: The Air Quality Index is 31 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 38 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:

• Patchy AM fog, mostly cloudy with a good (50%) chance of showers this afternoon and evening (0.10 in. of rain possible), a slight (20%) chance of showers late tonight (under 0.10 in. of rain possible),
• A (30%) chance of AM showers with areas of drizzle, a mix of clouds and sun Friday afternoon, becoming mostly cloudy late at night,
• Mostly cloudy Saturday AM, a mix of clouds and sun in the afternoon, then partly cloudy Saturday night.
• highs 68-65 lows 54-47.
• A mix of clouds and sun Sunday, partly cloudy Sunday night, Monday (Memorial Day), and Tuesday through Wednesday.
• highs 69-75 lows near 48. (seasonal averages high 68 low 44)
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Eugene-Springfield Pollen Count

Trees: Moderate- 25

Grass: High- 31

Reading as of: 5/20/15

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 a slight (20%) chance of thunderstorms this afternoon and evening, a slight (20%) chance of showers late tonight (under 0.10 in. of rain possible),
• Mostly cloudy with a slight (20%) chance of showers Friday, mostly cloudy in the evening, then just partly cloudy Friday night through Saturday night.
• highs near 70 lows 52-46.
• Partly cloudy Sunday through Monday (Memorial Day), mostly cloudy Monday night,
• Then mostly cloudy with a slight (20%) chance of showers Tuesday and Wednesday, partly cloudy with a slight (20%) chance of showers Tuesday night.
• highs near 75 lows 49-46. (seasonal averages high 71 low 48)
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Forecast for the South Oregon Coast including Coos Bay and North Bend:

• Cloudy with a (40%) chance of scattered coastal showers  while showers and a slight (20%) chance of isolated thunderstorms this evening (under 0.10 in. of rain possible),  just cloudy late tonight,
• Mostly cloudy Friday, then partly cloudy Friday night and Saturday, then mostly cloudy Saturday night.
• highs near 60 lows 53-48 warming to 50 Saturday night.
• Mostly cloudy Sunday, partly cloudy Sunday night,
• Partly cloudy Monday (Memorial Day), then  mostly cloudy Monday night through Wednesday.
• highs near 60 lows near 50. (seasonal averages high 59 low 48)

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Forecast for the Cascades in Lane County:

• Cloudy with a good (50%) chance of AM showers, showers likely (70%) with a slight (20%) chance of thunderstorms this afternoon and evening (0.25 in. of rain possible, more in storms), a slight (20%) chance of showers late tonight (0.10 in. of rain possible),
• Mostly cloudy with a (40%) chance of showers Friday, partly cloudy with a slight (20%) chance of showers in the evening, partly cloudy and colder late Friday night,
• Partly cloudy with a slight (20%) chance of showers Saturday afternoon and Saturday night.
• snow level above 8,000 ft. today through Friday, 7,500 ft. Friday night, 7,000 ft. Saturday, then above 8,000 ft. Saturday night.
• highs 56-52 lows 43-36.
• A mix of clouds and sun with a slight (20%) chance of showers Sunday, partly cloudy with a slight (20%) chance of showers at night,
• Partly cloudy Monday (Memorial Day), mostly cloudy with a slight (20%) chance of showers Monday night,
• Then a mix of clouds and sun with a slight (20%) chance of showers Tuesday and Wednesday, partly cloudy with a slight (20%) chance of showers Tuesday night.
• snow level 7,500 ft. Sunday, above 8,000 ft. Sunday night, free air freezing level 10,000 ft. Monday, then snow level above 8,000 ft. Monday night through Wednesday.
• highs 57-60 cooling to 55 Wednesday lows near 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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