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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 for the last time. What is a “temperature inversion?”  Here is the correct answer. A Temperature Inversion (surface-based or elevated) : a layer of the atmosphere in which air temperature increases with height. When the layer’s base is at the surface, the layer is called a surface-based temperature inversion; when the base of the layer is above the surface, the layer is called an elevated temperature inversion. I’ll have a new weekly weather quiz question for you starting Monday. 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 that has been controlling our weather is moving away from us. High pressure (“Arch” shape with blue arrows offshore) will be taking over midweek to keep us dry and in sunshine.

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Air Quality Index:

Eugene-Springfield: The Air Quality Index is 17 in the Good category measuring Particulate Matter.

Oakridge: The Air Quality Index is 27 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 CANCELLED FOR DETROIT LAKE LOCATED 46 MILES SOUTHEAST OF SALEM ON THE NORTH SANTIAM RIVER IN LINN AND MARION COUNTIES. WATER MONITORING ON MAY 18, 2015 HAS CONFIRMED THE TOXIN CONCENTRATIONS HAVE DROPPED TO A SAFE LEVEL.

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

• Mostly cloudy tonight,
• Cloudy in the AM, becoming a mix of clouds and sun Monday (Memorial Day), partly cloudy in the evening, mostly cloudy at night,
• Mostly cloudy a bit warmer Tuesday, partly cloudy Tuesday night,
• AM clouds, a mix of clouds and sun and a bit warmer Wednesday afternoon, then partly cloudy Wednesday night.
• lows near 48 highs 68-75.
• Partly cloudy Thursday through Friday evening, mostly cloudy Friday night and Saturday AM, partly cloudy in the afternoon and evening, mostly cloudy late at night,
• Then a mix of clouds and sun Sunday.
• highs 77 lows near 50. (seasonal averages high 69 low 45)
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Eugene-Springfield Pollen Count

Trees: Moderate- 27

Grass: High- 23

Reading as of: 5/23/15

Data courtesy of Oregon Allergy Associates.

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Forecast for the Umpqua Basin including Roseburg:

• Partly cloudy this evening, mostly cloudy tonight,
• Cloudy Monday AM (Memorial Day), partly cloudy Monday afternoon and evening, mostly cloudy at night,
• Mostly cloudy Tuesday AM, sunny in the afternoon, partly cloudy in the evening, mostly cloudy Tuesday night and Wednesday AM, sunny and warmer in the afternoon, then partly cloudy Wednesday night.
• lows 50-54 highs 77-84.
• Partly cloudy Thursday through Friday evening, mostly cloudy late Friday night,
• Then mostly cloudy with a slight (20%) chance of thunderstorms and a bit cooler Saturday and Saturday night,
• Partly cloudy Sunday AM, mostly cloudy and cooler with a slight (20%) chance of thunderstorms Sunday afternoon.
• highs 84-86 cooling to 74 Sunday lows 54-50. (seasonal averages high 72 low 49)
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Forecast for the South Oregon Coast including Coos Bay and North Bend:

• Mostly cloudy tonight and Monday (Memorial Day), partly cloudy in the evening, mostly cloudy late Monday night and Tuesday AM, partly cloudy Tuesday afternoon and evening, mostly cloudy at night,
• Mostly cloudy Wednesday AM, then partly cloudy in the afternoon and Wednesday night.
• lows 50-52 highs near 60.
• Partly cloudy Thursday through Friday, mostly cloudy Friday night through Saturday night,
• Then mostly cloudy Sunday with a slight (20%) chance of afternoon showers.
• highs 62-60 warming to 64 Saturday cooling to near 60 Sunday lows 52-48. (seasonal averages high 60 low 48)

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Forecast for the Cascades in Lane County:

• Mostly cloudy tonight and Monday AM (Memorial Day), a mix of clouds and sun in the afternoon, partly cloudy and colder Monday night,
• Partly cloudy Tuesday, partly cloudy with a slight (20%) chance of showers Tuesday night,
• Partly cloudy Wednesday with a slight (20%) chance of showers and thunderstorms in the afternoon and evening, then partly cloudy late Wednesday night.
• free air freezing level 12,000 ft. tonight, 11,000 ft. Monday through Tuesday, then snow level above 8,000 ft. Tuesday night through Wednesday night.
• lows 36-42 Wednesday night highs 58-64.
• A mix of clouds and sun and warmer Thursday, partly cloudy at night,
• A mix of clouds and sun with a slight (20%) chance of afternoon showers Friday, mostly cloudy with a slight (20%) chance of showers Friday night,
• Mostly cloudy with a slight (20%) chance of showers Saturday AM, a slight (20%) chance of showers and thunderstorms and cooler in the afternoon and evening, a slight (20%) chance of showers Saturday night,
• Then a mix of clouds and sun and a bit cooler Sunday with a slight (20%) chance of AM showers, a slight (20%) chance of showers and thunderstorms in the afternoon.
• free air freezing level 12,000 ft. Thursday, 13,000 ft. Thursday night, snow level above 8,000 ft. Friday through Sunday.
• highs 68-60 Saturday lows 46-52.

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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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