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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The upper level High Pressure Ridge (Shaded “Arch” shape with blue arrows) is slowly moving eastward ushering in an upper level trough of low pressure (Shaded “U” shape with blue arrows on previous graphic) that is setting up offshore. Cooler moist air moves inland from the coast finally cooling us down. A frontal system finally moved in to bring us some cooler air and possible showers. By next Monday a cold front will be pushing into the Pacific Northwest.

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Air Quality Index:

Eugene-Springfield: The Air Quality Index is 58 in the Moderate category measuring Particulate Matter.

Oakridge: The Air Quality Index is 22 in the Good category measuring Ozone.

Cottage Grove: The Air Quality Index is 58 in the Moderate 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 this evening, mostly cloudy late tonight,
• Mostly cloudy and cooler with a slight (20%) chance of showers Wednesday afternoon through Thursday night,
• Then mostly cloudy with a good (50%) chance of showers and a bit cooler Friday and Friday night.
• lows 55-46 highs 72-65.
• Mostly cloudy with a good (50%) chance of showers Saturday AM, a good (50%) chance of showers and a slight (20%) chance of thunderstorms and a bit warmer Saturday afternoon and evening, mostly cloudy with a (30%) chance of evening showers, a slight (20%) chance of showers late Saturday night,
• 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 showers in the evening, 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.
• highs 66-72 cooling to 69 Tuesday lows 46-50. (seasonal averages high 71 low 47).

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Eugene-Springfield Pollen Count:

Grass………. Very High (571)

Trees………. Moderate (63)

Last Counted: 6/7/16

Data Courtesy of Oregon Allergy Associates.

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Forecast for Roseburg:

• Mostly clear this evening, partly cloudy late tonight,
• Mostly cloudy and much cooler with a slight (20%) chance of showers Wednesday and in the evening, partly cloudy late Wednesday night,
• Partly cloudy with a slight (20%) chance of showers Thursday AM, mostly cloudy and a bit cooler with a slight (20%) chance of showers Thursday afternoon and at night,
• Then mostly cloudy with a (40%) chance of showers and a bit cooler Friday and Friday night.
• lows 59-49 highs 77-68.
• Mostly cloudy with a (30%) chance of showers and a slight (20%) chance of thunderstorms and a bit warmer Saturday and Saturday night,
• Mostly cloudy and a bit warmer with a (30%) chance of showers Sunday and Sunday night,
• Then mostly cloudy with a (40%) chance of showers and a bit warmer Monday through Tuesday.
• highs 69-75 lows 47-52 cooling back to 47 Monday night. (seasonal averages high 74 low 51).

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

• Partly cloudy this evening, mostly cloudy with a slight (20%) chance of showers late tonight,
• Mostly cloudy with a slight (20%) chance of showers Wednesday, partly cloudy with a slight (20%) chance of showers late Wednesday night and Thursday AM, mostly cloudy with a slight (20%) chance of showers in the afternoon and Thursday night,
• Then mostly cloudy with a (30%) chance of showers Friday and at night.
• lows 57-49 highs near 63.
• Mostly cloudy with a (30%) chance of showers Saturday and Saturday night,
• Mostly cloudy with a slight (20%) chance of showers Sunday, then a (30%) chance of showers Sunday night through Tuesday.
• highs 62-64 cooling back to 62 Tuesday lows 49-53 cooling back to 49 Monday night. (seasonal averages high 61 low 50)

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Forecast for the Cascades in Lane County:

• Partly cloudy with a (30%) chance of showers and thunderstorms this evening, a slight (20%) chance of showers late tonight (under 0.10 in. of rain possible, more in storms),
• Mostly cloudy and a bit cooler with a slight (20%) chance of showers Wednesday, a (30%) chance of evening showers, partly cloudy and colder with a slight (20%) chance of showers late Wednesday night,
• A mix of clouds and sun and a bit cooler with a slight (20%) chance of showers Thursday, partly cloudy with a slight (20%) chance of evening showers, then mostly cloudy with a slight (20%) chance of showers late Thursday night,
• Mostly cloudy with a good (50%) chance of showers and a bit cooler Friday afternoon and evening, a good (50%) chance of rain and snow showers late Friday night.
• snow level above 8,000 ft. tonight through Thursday, 7,500 ft. Thursday night, 6,500 ft. Friday, then 6,000 ft. Friday night.
• lows 48-34 highs 67-54.
• Mostly cloudy with a good (50%) chance of AM rain and snow showers and a slight (20%) chance of thunderstorms, a bit cooler with a good (50%) chance of rain and snow showers and a slight (20%) chance of thunderstorms Saturday afternoon and evening, a good (50%) chance of showers late Saturday night,
• A mix of clouds and sun and a bit warmer with a (40%) chance of AM showers, a slight (20%) chance of showers Sunday afternoon, partly cloudy with a sight (20%) chance of evening showers, mostly 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 (40%) chance of showers at night,
• Then a mix of clouds and sun with a (40%) chance of showers and a bit cooler Tuesday.
• snow level 4,500 ft. Saturday, 5,500 ft. Saturday night, 6,000 ft. Sunday, 7,500 ft. Sunday night, above 8,000 ft. Monday, 7,500 ft. Monday night, then 7,000 ft. Tuesday.
• highs 52-62 cooling to 6o Tuesday lows 36-39 cooling back to 36 Monday night.

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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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