Here is my new 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 then moves inland from the coast.  A frontal system is on its way 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 39 in the Good category measuring Particulate Matter.

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

Cottage Grove: The Air Quality Index is 40 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 sunny and still warm this afternoon, mostly clear this evening, mostly cloudy late tonight,
• Mostly cloudy and cooler with a slight (20%) chance of showers Wednesday afternoon through Thursday night,
• highs 90-70 lows 55-48.
• Mostly cloudy with a good (50%) chance of showers and a bit cooler Friday through 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, partly cloudy with 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, then mostly cloudy with a (30%) chance of showers at night and Monday.
• highs 65-72 lows 46-50. (seasonal averages high 71 low 46.)

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Eugene-Springfield Pollen Count:

Grass………. Very High (375)

Trees………. High (93)

Last Counted: 6/5/16

Data Courtesy of Oregon Allergy Associates.

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Forecast for Roseburg:

• Partly cloudy and a bit cooler this afternoon tonight,
• Mostly cloudy a bit cooler with a slight (20%) chance of showers Wednesday, partly cloudy with a slight (20%) chance of showers Wednesday night,
• Partly cloudy with a slight (20%) chance of AM showers, mostly cloudy and a bit cooler with a slight (20%) chance of showers Thursday afternoon and at night.
• highs 93-72 lows 59-50.
• Mostly cloudy with a (40%) chance of showers and a bit cooler Friday and Friday night,
• 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 slight (20%) chance of showers Sunday, then mostly cloudy with a (30%) chance of showers and a bit warmer Sunday night and Monday.
• highs 68-73 lows 49-47 warming to 52 Saturday night. (seasonal averages high 74 low 50).

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

• Partly cloudy this afternoon and evening, mostly cloudy late tonight,
• Mostly cloudy with a slight (20%) chance of showers Wednesday and in the evening, partly cloudy with a slight (20%) chance of showers late Wednesday night.
• Increasing clouds with a slight (20%) chance of showers Thursday and Thursday night.
• highs 65-63 lows 57-50.
• Mostly cloudy with a (30%) chance of showers Friday afternoon and at night,
• Mostly cloudy with a (%) 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 and Monday.
• highs near 63 lows 49-52. (seasonal averages high 61 low 50)

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Forecast for the Cascades in Lane County:

• Partly cloudy with a slight (20%) chance of showers and thunderstorms and a bit cooler this afternoon (0.10 in. of rain possible, more in storms) and tonight (under 0.10 in. of rain possible, more in storms),
• A mix of clouds and sun with a slight (20%) chance of showers Wednesday AM, a slight (20%) chance of showers and a bit cooler in the afternoon, mostly cloudy with 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.
• snow level above 8,000 ft. today through Thursday night.
• highs 82-62 lows 48-39.
• 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,
• A mix of clouds and sun and a bit cooler with a (40%) chance of rain and snow showers and a slight (20%) chance of thunderstorms Saturday afternoon and evening, 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, partly cloudy with a sight (20%) chance of showers at night,
• A mix of clouds and sun Monday with a slight (20%) chance of AM showers and a (30%) chance of showers and a bit warmer Monday afternoon.
• snow level 6,500 ft. Friday, 5,500 ft. Friday night, 5,000 ft. Saturday, 6,000 ft.  Saturday night, 6,500 ft. Sunday, then above 8,000 ft. Sunday night and Monday.
• highs 54-50 warming to 62 Monday lows 34-39.

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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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