Here is my weekly weather quiz question. What is a “Severe Thunderstorm?” 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 trough of low pressure (Shaded “U” shape with blue arrows) that is offshore has brought cooler moist air inland from the coast cooling us down from record highs to below average temperatures. A frontal system finally moved through to bring the change. By next Monday a frontal system will be pushing through the Pacific Northwest.

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Air Quality Index:

Eugene-Springfield: The Air Quality Index is 24 in the Good category measuring Particulate Matter.

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

Cottage Grove: The Air Quality Index is 19 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 a slight (20%) chance of showers this evening, just mostly cloudy late tonight,
• Mostly cloudy and a bit cooler with a slight (20%) chance of showers Thursday (under 0.10 in. of rain possible) and Thursday night (under 0.10 in. of rain possible),
• A good (50%) chance of showers and a bit cooler Friday (under 0.10 in. of rain possible) and at night (under 0.10 in. of rain possible),
• Mostly cloudy with a good (50%) chance of showers and a slight (20%) chance of thunderstorms and a bit warmer Saturday afternoon, showers likely (70%) with a slight (20%) chance of thunderstorms in the evening, then a slight (20%) chance of showers late Saturday night.
• lows 50-46 highs 66-64 warming back to 66 Saturday.
• A mix of clouds and sun and a bit warmer with a slight (20%) chance of showers Sunday, mostly cloudy with a slight (20%) chance of evening showers, a (30%) chance of showers late Sunday night through Monday night,
• Then mostly cloudy and a bit cooler with a (40%) chance  of showers Tuesday through Wednesday.
• highs 70-66 lows 50-47. (seasonal averages high 71 low 47).

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Eugene-Springfield Pollen Count:

Grass………. Very High (248)

Trees………. Moderate (34)

Last Counted: 6/8/16

Data Courtesy of Oregon Allergy Associates.

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Forecast for Roseburg:

• Mostly cloudy with a slight (20%) chance of showers this evening, partly cloudy late tonight,
• Mostly cloudy with a slight (20%) chance of showers Thursday (under 0.10 in. of rain possible) and at night (under 0.10 in. of rain possible),
• Mostly cloudy with a (30%) chance of showers and a bit cooler Friday (under 0.10 in. of rain possible), a (40%) chance of showers at night (under 0.10 in. of rain possible),
• Mostly cloudy with a (30%) chance of AM showers,  a slight (20%) chance of thunderstorms Saturday afternoon, a (30%) chance of evening showers, then partly cloudy with a (30%) chance of showers late Saturday night.
• lows 53-46 highs 72-67.
• Partly cloudy with a slight (20%) chance of AM showers, mostly cloudy and a bit warmer with a slight (20%) chance of showers Sunday afternoon, then partly cloudy with a slight (20%) chance of showers  Sunday night through Wednesday.
• highs 75-70 lows 52-50 warming back to 50 Tuesday night. (seasonal averages high 74 low 51).

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

• Mostly cloudy with a slight (20%) chance of evening inland showers, partly cloudy late tonight,
• Mostly cloudy and a bit cooler with a slight (20%) chance of showers Thursday (under 0.10 in. of rain possible) and at night (under 0.10 in. of rain possible),
• Mostly cloudy with a (40%) chance of showers and a bit cooler Friday (under 0.10 in. of rain possible) and Friday night (under 0.10 in. of rain possible),
• Mostly cloudy with a (30%) chance of showers Saturday and in the evening, then partly cloudy with a (30%) chance of showers Saturday night.
• lows 52-50 highs 62-60.
• Partly cloudy with a slight (20%) chance of showers Sunday AM, mostly cloudy and a bit warmer with a slight (20%) chance of showers Sunday afternoon and at night,
• Then mostly cloudy with a (30%) chance of showers Monday and Monday night,
• Then Partly cloudy with a (30%) chance of showers Tuesday through Wednesday.
• highs 63-59 warming t0 62 Wednesday lows 53-50 warming back to 53 Tuesday night. (seasonal averages high 61 low 50)

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Forecast for the Cascades in Lane County:

• Mostly cloudy with a (30%) chance of evening showers, partly cloudy and colder with a slight (20%) chance of showers late tonight (under 0.10 in. of rain possible),
• Partly cloudy Thursday AM, mostly cloudy and a bit cooler with a good (50%) chance of showers in the afternoon and evening, a slight (20%) chance of showers late Thursday night (under 0.10 in. of rain possible),
• Mostly cloudy with a good (50%) chance of AM showers, a bit cooler with showers likely (70%) Friday afternoon, a good (50%) chance of showers late Friday night,
• Mostly cloudy and a bit cooler with a good (50%) chance of showers and a slight (20%) chance of thunderstorms Saturday afternoon, showers likely (70%) with a slight (20%) chance of evening thunderstorms, then partly cloudy with a slight (20%) chance of showers late Saturday night.
• snow level above 8,000 ft. tonight, 7,500 ft. Thursday, 7,000 ft. Thursday night, 6,500 ft. Friday, 5,500 ft. Friday night, 5,000 ft. Saturday, then 5,500 ft. Saturday night.
• lows 42-34 highs 57-48.
• A mix of clouds and sun and a bit warmer with a slight (20%) chance of showers Sunday afternoon, partly cloudy with a slight (20%) chance of showers late at night,
• A mix of clouds and sun and a bit warmer Monday with a slight (20%) chance of AM showers and a (30%) chance of showers and a bit warmer Monday afternoon, mostly cloudy with a (30%) chance of showers at night through Tuesday night,
• Then a mix of clouds and sun with a (40%) chance of showers and a bit cooler Wednesday.
• snow level 6,000 ft. Sunday, 7,500 ft. Sunday night, above 8,000 ft. Monday, 8,000 ft. Monday night, 5,500 ft. Tuesday, 5,000 ft. Tuesday night, then 4,500 ft. Wednesday.
• highs 57-60 cooling to 53 Wednesday lows 39-34.

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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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