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Here is my new weekly weather quiz question. What is a “lysimeter?” 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) is taking over to keep us warmer, dry and in sunshine for a while.

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Air Quality Index:

Eugene-Springfield: The Air Quality Index is 30 in the Good category measuring Particulate Matter.

Oakridge: The Air Quality Index is 22 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: None At This Time.

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

Mostly cloudy this AM, mostly sunny and warmer this afternoon, partly cloudy tonight and Thursday AM, mostly sunny Thursday and Friday, partly cloudy in the evening, mostly cloudy late Friday night.
highs 77-84 lows 50-52.
Partly cloudy Saturday and Saturday night,
A mix of clouds and sun and a bit cooler Sunday, mostly cloudy with a (30%) chance of showers Sunday night and Monday, then mostly cloudy with a slight (20%) chance of showers Monday night and Tuesday.
highs 82-70 lows near 50. (seasonal averages high 69 low 45)
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Eugene-Springfield Pollen Count

Trees: Low- 12

Grass: Very High- 252

Reading as of: 5/26/15

Data courtesy of Oregon Allergy Associates.

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Forecast for the Umpqua Basin including Roseburg:

Mostly cloudy this AM, sunny and warmer in the afternoon, mostly clear tonight,
Partly cloudy in the AM, sunny and warmer Thursday afternoon, mostly clear in the evening, partly cloudy late Thursday night and Friday AM, mostly sunny with a slight (20%) chance of afternoon and evening thunderstorms, then mostly cloudy late Friday night.
highs 82-85 lows 53-56.
Mostly cloudy in the AM, mostly cloudy with a slight (20%) chance of thunderstorms and a bit cooler Saturday afternoon and evening, mostly cloudy with a slight (20%) chance of showers and thunderstorms thunderstorms Saturday night through Sunday evening, then a slight (20%) chance of showers late Sunday night,
Then mostly cloudy and cooler with a slight (20%) chance of showers Monday through Tuesday.
highs 83-70 lows 56-49. (seasonal averages high 72 low 49)
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Forecast for the South Oregon Coast including Coos Bay and North Bend:

Mostly cloudy this AM, partly cloudy in the afternoon and evening, mostly cloudy late tonight,
Mostly cloudy Thursday AM, sunny in the afternoon, mostly clear in the evening, partly cloudy late Thursday night,
Mostly cloudy Friday AM, partly cloudy in the afternoon, then mostly cloudy Friday night.
highs near 62 lows 50-52.
Mostly cloudy Saturday and at night,
Mostly cloudy with a slight (20%) chance of showers Sunday afternoon, a slight (20%) chance of evening thunderstorms, then mostly cloudy with a slight (20%) chance of showers late Sunday night through Tuesday
highs 62-58 warming back to 62 Tuesday lows 52-50. (seasonal averages high 60 low 48)

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Forecast for the Cascades in Lane County:

Partly cloudy today and a bit warmer with a slight (20%) chance of showers this afternoon and evening, becoming mostly clear late tonight,
Mostly sunny Thursday, partly cloudy at night,
Mostly sunny Friday AM, partly cloudy with a slight (20%) chance of showers in the afternoon, mostly cloudy with a slight (20%) chance of evening showers, then just mostly cloudy Friday night.
snow level above 8,000 ft. today and tonight, free air freezing level 12,000 ft. Thursday and Thursday night, then snow level above 8,000 ft. Friday and Friday night.
highs 64-72 lows 42-47.
A mix of clouds and sun with a slight (20%) chance of showers and thunderstorms Saturday afternoon, partly cloudy with a slight (20%) chance of evening showers and thunderstorms, just mostly cloudy late at night Saturday,
A mix of clouds and sun Sunday with a (40%) chance of showers and thunderstorms in the afternoon, mostly cloudy with a (40%) chance of showers and thunderstorms in the evening,
Mostly cloudy with a (40%) chance of showers Monday, then a (30%) chance of showers Monday night and Tuesday.
snow level above 8,000 ft. Saturday, 10,000 ft. Saturday night through Monday, then 9,000 ft. Monday night and Tuesday.
highs 69-54 lows 46-38.

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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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