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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 high pressure ridge (“Arch” shape with blue arrows offshore) has taking over to keep us warmer than normal. An upper level low (Shaded “U” shape with blue arrows of the same graphic) will swing in through northern California returning the clouds and the chance of showers and at the same time cool us down.

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Air Quality Index:

Eugene-Springfield: The Air Quality Index is 32 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 35 in the Good category measuring Ozone.

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 clear tonight,
Mostly sunny and warmer Friday, partly cloudy at night,
A mix of clouds and sun and just a bit cooler Saturday, partly cloudy in the evening, mostly cloudy late Saturday night,
A mix of clouds and sun Sunday AM, increasing clouds to cloudy and a bit cooler with a (30%) chance of showers Sunday afternoon, then a good (50%) chance of showers Sunday night.
lows 50-53 highs 85-75.
Cloudy with a good (50%) chance of showers Monday and Monday night,
Mostly cloudy with a (40%) chance of showers Tuesday AM, a slight (20%) chance of showers and a bit warmer in the afternoon and at night,
A mix of clouds and sun and a bit warmer with a slight (20%) chance of showers a Wednesday, partly cloudy with a slight (20%) chance of showers in the evening, then just partly cloudy Wednesday night and Thursday.
highs 64-70 lows 52-47. (seasonal averages high 69 low 45)
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Eugene-Springfield Pollen Count

Trees: Low- 13

Grass: Very High- 315

Reading as of: 5/28/15

Data courtesy of Oregon Allergy Associates.

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Forecast for the Umpqua Basin including Roseburg:

Mostly clear tonight,
Partly cloudy Friday AM, mostly sunny with a slight (20%) chance of afternoon thunderstorms, just mostly cloudy late Friday night,
Mostly cloudy Saturday with a slight (20%) chance of thunderstorms and a bit cooler Saturday afternoon and evening, mostly cloudy late Saturday night and Sunday AM, a slight (20%) chance of thunderstorms in the afternoon and evening, then a (30%) chance of showers late Sunday night.
lows near 56 highs 86-77.
Cloudy with AM showers likely (60%) Monday, a (40%) chance of showers and cooler in the afternoon and Monday night through Tuesday, mostly cloudy with a slight (20%) chance of showers Tuesday night through Thursday AM, then just partly cloudy and warmer Thursday afternoon.
highs 66-74 lows near 50. (seasonal averages high 72 low 49)
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Forecast for the South Oregon Coast including Coos Bay and North Bend:

Mostly clear tonight,
Mostly cloudy Friday AM, sunny in the afternoon, partly cloudy in the evening, mostly cloudy late Friday night through Saturday night,
Then cloudy with a (30%) chance of showers Sunday and Sunday night.
lows near 52 highs near 60.
Cloudy with a (30%) chance of showers Monday and Monday night,
Mostly cloudy with a (30%) chance of showers Tuesday, a slight (20%) chance of showers in the evening, then just mostly cloudy late Tuesday night through Thursday.
highs 57-62 lows 52-50. (seasonal averages high 60 low 49)

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Forecast for the Cascades in Lane County:

A slight (20%) chance of showers and thunderstorms this evening, becoming mostly clear late tonight,
Mostly sunny Friday AM, partly cloudy and warmer with a slight (20%) chance of showers and thunderstorms in the afternoon and evening, just partly cloudy late Friday night,
A mix of clouds and sun and a bit cooler with a slight (20%) chance of showers and thunderstorms Saturday afternoon, mostly cloudy with a slight (20%) chance of showers and thunderstorms in the evening, then just mostly cloudy late at night,
Mostly cloudy and cooler Sunday with a good (50%) chance of showers and thunderstorms in the afternoon, becoming cloudy with a good (50%) chance of showers and thunderstorms in the evening, then a good (50%) chance of showers late Sunday night.
snow level above 8,000 ft. tonight through Sunday night.
lows 46-43 highs 73-65.
Cloudy and cooler with a good (50%) chance of showers Monday, mostly cloudy with a good (50%) chance of showers at night,
A (40%) chance of showers Tuesday, a (30%) chance of evening showers, a slight (20%) chance of showers late Tuesday night,
A mix of clouds and sun with a slight (20%) chance of showers Wednesday, partly cloudy with a slight (20%) chance of showers Wednesday night and Thursday AM, then just partly cloudy Thursday afternoon.
snow level 8,000 ft. Monday, 8,000 ft. falling to 7,000 ft. late Monday night, 7,000 ft. Tuesday and Tuesday night, 7,500 ft. Wednesday, then 8,000 ft. Wednesday night and Thursday.
highs 52-55 lows 38-36.

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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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