Here is my weekly weather quiz question for the last time. What is a “Severe Thunderstorm?” Here is the correct answer. A Severe Thunderstorm is a thunderstorm that produces a tornado, winds of at least 58 mph (50knots), and/or hail at least 1 inch in diameter. Structural wind damage may imply the occurrence of a severe thunderstorm. A thunderstorm wind equal to or greater than 40 mph (35 knots) and/or hail of at least 1 inch is defined as approaching severe.  I’ll have a new weekly weather question for you starting Monday. 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 return the chance of rain.  A frontal system moves in with cooler temperatures and the chance of showers. By the end of the week another frontal system moves in to our South continuing the rain chances, small though they may be.

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Air Quality Index:

Eugene-Springfield: The Air Quality Index is 36 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 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:

• Partly cloudy tonight,
• Mostly cloudy with a slight (20%) chance of AM showers, a good (50%) chance of showers and a bit cooler Monday afternoon, a good (50%) chance of showers Monday night,
• Showers likely (70%) Tuesday AM, showers likely (70%) with a slight (20%) chance of thunderstorms in the afternoon and evening, a slight (20%) chance of showers late Tuesday night,
• A mix of clouds and sun with a (30%) chance of AM showers, a slight (20%) chance of showers and a bit warmer Wednesday afternoon, mostly cloudy with a slight (20%) chance of evening showers, then a (40%) chance of showers late Wednesday night.
• lows 49-45 highs 65-63 warming to 68 Wednesday.
• Mostly cloudy with a (30%) chance of showers Thursday, a good (50%) chance of showers and a bit cooler Thursday night and Friday, a (30%) chance of evening showers, partly cloudy with a slight (20%) chance of showers late Friday night,
• A mix of clouds and sun Saturday, then partly cloudy with a slight (20%) chance of showers Saturday night and Sunday.
• highs 65-72 lows near 46. (seasonal averages high 72 low 47).

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Eugene-Springfield Pollen Count:

Grass………. Moderate (19)

Trees………. Low (11)

Last Counted: 6/10/16

Data Courtesy of Oregon Allergy Associates.

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Forecast for Roseburg:

• Mostly clear this evening, partly cloudy late tonight,
• Mostly cloudy and a bit cooler with a (30%) chance  of showers Monday and Monday night,
• Mostly cloudy and a bit cooler with a good (50%) chance of showers Tuesday, a (30%) chance of showers at night,
• Mostly cloudy and a bit warmer with a (30%) chance of showers Wednesday, a (30%) chance of showers and a slight (20%) chance of thunderstorms in the evening, then a (30%) chance of showers late Wednesday night.
• lows 50-46 highs 68-64 warming back to 68 Wednesday.
• Mostly cloudy with a good (50%) chance of showers and a bit warmer Thursday through Friday evening, then  partly cloudy and a bit warmer with slight (20%) chance of showers late Friday night through Sunday.
• highs 67-78 lows 49-52. (seasonal averages high 75 low 51).

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

• Mostly clear this evening, partly cloudy late tonight,
• Mostly cloudy with a (30%) chance of showers and a bit cooler Monday, a (30%) chance of evening coastal showers and showers likely (60%) late at night while a (30%) chance of inland showers Monday night,
• Mostly cloudy and a bit cooler with AM coastal showers likely (60%) while a (40%) chance of inland showers Tuesday, a (30%) chance of showers at night,
• Mostly cloudy with a slight (20%) chance of showers Wednesday, a slight (20%) chance of evening showers, then a (40%) chance of showers late Wednesday night.
• lows 52-48 warming back to 50 Wednesday night highs near 60.
• Mostly cloudy and a bit warmer with a good (50%) chance of showers Thursday through Friday night,
• Then partly cloudy with a slight (20%) chance of showers and a bit warmer Saturday through Sunday.
• highs 60-64 lows 50-52. (seasonal averages high 61 low 50)

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Forecast for the Cascades in Lane County:

• Partly cloudy tonight,
• Mostly cloudy with a slight (20%) chance of showers Monday AM, a bit cooler in the afternoon with a good (50%) chance of showers (under 0,10 in. of rain possible), evening showers likely (70%),  a good (50%) chance of rain and snow showers late Monday night,
• Mostly cloudy with rain and snow showers likely (70%) and a bit cooler Tuesday, a good (50%) chance of rain and snow showers Tuesday night,
• A mix of clouds and sun with a (40%) chance of rain and snow showers and a bit warmer Wednesday, then mostly cloudy with a good (50%) chance of rain and snow showers at night.
• free air freezing level 11,000 ft. tonight, snow level above 8,000 ft. Monday, 7,000 ft. falling to 5,000 ft. late Monday night, 4,500 ft. Tuesday and Tuesday night, 5,000 ft. Wednesday, then 6,000 ft. Wednesday night.
• lows 38-33 highs 56-45 warming to 53 Wednesday.
• Mostly cloudy with a good (50%) chance of showers and a bit cooler Thursday, a (30%) chance of evening showers, showers becoming likely (60%) late at night,
• Mostly cloudy with AM showers likely (60%), a (30%) chance of showers and a bit warmer Friday afternoon, partly cloudy with a slight (20%) chance of showers Friday night,
• A mix of clouds and sun and a bit warmer with a slight (20%) chance of showers Saturday, then partly cloudy and a bit warmer with a slight (20%) chance of showers Saturday night and Sunday.
• snow level 6,000 ft. Thursday, 6,500 ft. Thursday night, 6,000 ft. Friday, 6,500 ft. Friday night and Saturday, then above 8,000 ft. Saturday night and Sunday.
• highs 47-59 lows 34-38.

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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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