Here is my new weekly weather quiz question. What is “Shear?” 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 is moving down from Canada to returning the chance of rain.  A frontal system moved through Monday with cooler temperatures and the chance of showers.

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Air Quality Index:

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

Oakridge: The Air Quality Index is 7 in the Good category measuring Ozone.

Cottage Grove: The Air Quality Index is 31 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 cloudy with showers and a slight (20%) chance of isolated thunderstorms and a bit cooler this afternoon and evening (0.25 in. of rain possible, small hail possible), a slight (20%) chance of showers and colder late tonight,
• A mix of clouds and sun Wednesday with a slight (20%) chance of AM showers, a (40%) chance of showers and a bit warmer in the afternoon, a slight (20%) chance of showers Wednesday night,
• Mostly cloudy with a good (50%) chance of showers Thursday AM, a good (50%) chance of showers and a slight (20%) chance of thunderstorms in the afternoon and evening, then a good (50%) chance of showers Thursday night.
• highs 64-67 cooling to 65 Thursday lows 42-47.
• Mostly cloudy and a bit warmer with a good (50%) chance of showers Friday, partly cloudy with a (40%) chance of evening showers, partly cloudy with a slight (20%) chance of showers late Friday night,
• A mix of clouds and sun with a slight (20%) chance of showers and a bit warmer Saturday, partly cloudy with a slight (20%) chance of evening showers, partly cloudy and a bit warmer late Saturday night through Sunday night,
• Then mostly sunny and a bit warmer Monday.
• highs 69-82 lows 45-50. (seasonal averages high 72 low 47).

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Eugene-Springfield Pollen Count:

Grass………. Very High (246)

Trees………. Low (10)

Last Counted: 6/13/16

Data Courtesy of Oregon Allergy Associates.

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Forecast for Roseburg:

• Mostly cloudy and a bit cooler with a showers likely (70%) this afternoon (0.15 in. of rain possible), a (30%) chance of evening showers, partly cloudy with a (30%) chance of showers late tonight,
• Mostly cloudy and a bit warmer with a (30%) chance of showers Wednesday (under 0.10 in. of rain possible), a (30%) chance of showers and a slight (20%) chance of thunderstorms in the evening, a (30%) chance of showers late Wednesday night (under 0.10 in. of rain possible),
• Mostly cloudy with a good (50%) chance of showers Thursday, a good (50%) chance of showers with a slight (20%) chance of thunderstorms in the evening, then a (40%) chance of showers late Thursday night.
• highs 64-66 lows 45-48.
• Mostly cloudy with a good (50%) chance of showers Friday, a slight (20%) chance of evening showers, just partly cloudy and a bit warmer Friday night through Sunday night,
• Then sunny & warm Monday.
• highs 66-82 lows 48-55. (seasonal averages high 75 low 52).

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Forecast for The South Oregon Coast Including Coos Bay and North Bend:

• Mostly cloudy and a bit cooler today with coastal showers likely (60%) with a slight (20%) chance of thunderstorms while a good (50%) chance of inland AM showers and a good (50%) chance of showers and a slight (20%) chance of inland afternoon showers (0.25 in. of rain possible), a (30%) chance of showers tonight (under 0.10 in. of rain possible),
• Partly cloudy Wednesday AM, mostly cloudy with a (30%) chance of showers and a bit warmer Wednesday afternoon (under 0.10 in. of rain possible), a (30%) chance of showers with a slight (20%) chance of thunderstorms in the evening, a (40%) chance of showers late Wednesday night (under 0.10 in. of rain possible),
• Mostly cloudy with a good (50%) chance of showers Thursday, a good (50%) chance of showers and a slight (20%) chance of thunderstorms in the evening, then a (30%) chance of showers late Thursday night.
• highs 59-62 lows 48-52.
• Mostly cloudy with a good (50%) chance of showers Friday, a slight (20%) chance of evening showers, then partly cloudy late Friday night,
• Then partly cloudy and a bit warmer Saturday through Monday.
• highs 60-67 lows near 53. (seasonal averages high 62 low 50)

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Forecast for the Cascades in Lane County:

• Mostly cloudy with rain and snow showers and a bit cooler today (0.25 in. of rain possible, 1-3 in. of snow possible), rain and snow showers increasing this evening, a slight (20%) chance of rain and snow showers late tonight,
• A mix of clouds and sun with a slight (20%) chance of rain and snow showers Wednesday AM, a good (50%) chance of rain and snow showers in the afternoon and at night,
• Mostly cloudy with a good (50%) chance of AM rain and snow showers, showers likely (70%) with a slight (20%) chance of thunderstorms and a bit cooler Thursday afternoon, a good (50%) chance of showers and a slight (20%) chance of thunderstorms in the evening, a good (50%) chance of showers late Thursday night.
• snow level 4,000 ft. today, 4,500 ft. Tuesday night and Wednesday, 5,500 ft. Wednesday night, 5,500 ft. Thursday, then 6,000 ft. Thursday night.
• highs 42-50 cooling to 46 Thursday lows 32-35.
• Mostly cloudy with a good (50%) chance of showers and a bit warmer Friday, partly cloudy a (40%) chance of evening showers, a slight (20%) chance of showers late Friday night,
• A mix of clouds and sun and a bit warmer with a slight (20%) chance of showers Saturday, partly cloudy with a slight (20%) chance of evening showers, just partly cloudy late Saturday night,
• A mix of clouds and sun and a bit warmer Sunday, partly cloudy at night,
• Then mostly sunny and a bit warmer Monday.
• snow level 6,000 ft. Friday and Friday night, 7,500 ft. Saturday, above 8,000 ft. Saturday night, free air freezing level 10,000 ft. Sunday and Sunday night, then 12,000 ft. Monday.
• highs 52-70 lows 34-42.

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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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