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 has moved down from Canada to returning the chance of rain. It looks like we won’t see another frontal system until next Wednesday. In the meantime that pesky low pressure trough will dominate our weather pattern.

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Air Quality Index:

Eugene-Springfield: The Air Quality Index is 13 in the Good category measuring Particulate Matter.

Oakridge: The Air Quality Index is 6 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 9 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:

• Partly cloudy with a good (50%) chance of showers and a slight (20%) chance of thunderstorms this afternoon (under 0.10 in. of rain possible, small hail possible), mostly cloudy with a slight (20%) chance of evening showers and thunderstorms, a good (50%) chance of showers late tonight (under 0.10 in. of rain possible),
• A mix of clouds and sun with a good (50%) chance of showers Thursday (0.10 in. of rain possible), mostly cloudy with a good (50%) chance of showers Thursday night (under 0.10 in. of rain possible),
• Showers with a slight (20%) chance of thunderstorms Friday and in the evening showers, then a slight (20%) chance of showers late Friday night.
• highs near 65 lows 47-45.
• Partly cloudy and a bit warmer with a slight (20%) chance of showers Saturday and in the evening, just partly cloudy Saturday night,
• AM clouds, mostly sunny and a bit warmer Sunday and Monday, mostly clear at night,
  Then sunny and a bit warmer Tuesday.
• highs 69-83 lows 47-53. (seasonal averages high 73 low 48).

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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:

• Patchy AM fog, mostly cloudy and a bit warmer with a (40%) chance of showers this afternoon (under 0.10 in. of rain possible), a (30%) chance of showers tonight (under 0.10 in. of rain possible),
• Mostly cloudy with a (40%) chance of AM showers, showers likely (60%) with a slight (20%) chance of thunderstorms Thursday afternoon (0.10 in. of rain possible), a (40%) chance of evening showers and a slight (20%) chance of thunderstorms, a (40%) chance of showers late Thursday night (under 0.10 in. of rain possible),
• Mostly cloudy with a good (50%) chance of showers AM, showers likely (70%) Friday afternoon, then partly cloudy with a slight (20%) chance of showers Friday night.
• highs 66-68 lows 49-47.
• Partly cloudy with a slight (20%) chance of showers Saturday AM, sunny and a bit warmer in the afternoon, clear Saturday night,
• Then mostly sunny and a bit warmer Sunday through Tuesday, mostly clear at night.
• highs 74-84 lows 52-55. (seasonal averages high 76 low 52).

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

• Mostly cloudy with a (40%) chance of showers and a bit warmer this afternoon (under 0.10 in. of rain possible), a (30%) chance of showers tonight (under 0.10 in. of rain possible),
• Mostly cloudy with a (30%) chance of coastal showers Thursday while a (30%) chance of inland AM showers and showers likely (70%) with a slight (20%) chance of thunderstorms inland in the afternoon (under 0.10 in. of rain possible), a (30%) chance of showers Thursday night (under 0.10 in. of rain possible),
• Mostly cloudy with a good (50%) chance of showers Friday AM, showers likely (70%) in the afternoon, partly cloudy with a slight (20%) chance of evening showers, then just partly cloudy late Friday night.
• highs near 60 lows 48-52 cooling back to 48 Friday night.
• Partly cloudy with a slight (20%) chance of showers in the AM, sunny and a bit warmer Saturday afternoon, clear at night,
• Mostly sunny Sunday through Tuesday, mostly clear at night.
• highs 62-70 lows near 52. (seasonal averages high 62 low 51)

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Forecast for the Cascades in Lane County:

• Partly cloudy with rain and snow showers a good (50%) chance of rain and snow showers this AM, likely (70%) with a slight (20%) chance of thunderstorms this afternoon (under 0.10 in. of rain possible), scattered evening showers, a good (50%) chance of rain and snow showers late tonight (0.10 in. of rain possible),
• Mostly cloudy with a good (50%) chance of AM rain and snow showers, showers with a slight (20%) chance of thunderstorms and a bit cooler Thursday afternoon, showers likely (60%)  and a slight (20%) chance of thunderstorms in the evening, a good (50%) chance of showers late Thursday night through Friday evening, then a slight (20%) chance of showers late Friday night.
• snow level 4,500 ft. rising to 5,500 ft. today, 5,000 ft. tonight and Thursday, then 6,000 ft.Thursday night through Friday night.
• highs 45-53 lows 32-35 cooling back to 32 Friday night .
• Partly cloudy and a bit warmer with a (30%) chance of showers Saturday and in the evening, just partly cloudy late Saturday night,
• Partly cloudy and a bit warmer Sunday and at night,
• Mostly sunny and a bit warmer Monday, clear at night,
• Then  sunny and a bit warmer Tuesday.
• snow level 7,500 ft. Saturday, 8,000 ft. Saturday night, free air freezing level 10,000 ft. Sunday, 11,000 ft. Sunday night, 13,000 ft. Monday, then 14,000 ft. Monday night and Tuesday.
• highs 60-74 lows 37-45.

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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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