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 23 in the Good category measuring Particulate Matter.

Oakridge: The Air Quality Index is 14 in the Good category measuring Ozone.

Cottage Grove: The Air Quality Index is 23 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, a (40%) chance of showers late tonight (under 0.10 in. of rain possible),
• A good (50%) chance of showers with a slight (20%) chance of thunderstorms and a bit warmer Friday afternoon and in the evening, (under 0.10 in. of rain possible, more in storms), just mostly cloudy late at night,
• Mostly cloudy with a good (50%) chance of showers and a bit warmer Saturday, a slight (20%) chance of showers in the evening, just mostly cloudy late Saturday night,
• Partly cloudy and a bit warmer Sunday and in the evening, then mostly cloudy with a slight (20%) chance of showers late Sunday night.
• lows 48-46 warming back to 48 Sunday night highs 65-72.
•  Mostly cloudy with a slight (20%) chance of showers and a bit cooler Monday and in the evening, mostly cloudy with a (30%) chance of showers late Monday night through Wednesday evening, a slight (20%) chance of showers late Wednesday night,
• Then mostly cloudy with a (30%) chance of showers and a bit warmer Thursday.
• highs 67-63 warming to 68 Thursday lows 50-45 warming to 48 Wednesday night. (seasonal averages high 72 low 47).

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Eugene-Springfield Pollen Count:

Grass………. High (46)

Trees………. Moderate (21)

Last Counted: 6/9/16

Data Courtesy of Oregon Allergy Associates.

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Forecast for Roseburg:

• Mostly cloudy with a (40%) chance of showers tonight (under 0.10 in. of rain possible),
• Mostly cloudy with a good (50%) chance of AM showers, partly cloudy with a good (50%) chance of showers and a bit cooler Friday afternoon (under 0.10 in. of rain possible), a (40%) chance of showers and a slight (20%) chance of thunderstorms in the evening, mostly cloudy with a slight (20%) chance of showers late Friday night (under 0.10 in. of rain possible),
• Mostly cloudy with a (30%) chance of showers and a bit warmer Saturday, a slight (20%) chance of evening showers, becoming mostly clear late Saturday night,
• Sunny and a bit warmer Sunday, mostly clear in the evening, then partly cloudy late Sunday night.
• lows 50-47 warming to 52 Sunday night highs 65-78.
• Mostly cloudy with a slight (20%) chance  of showers Monday and Monday night,
• Then mostly cloudy with a (30%) chance of showers Tuesday through Thursday.
• highs 74-67 warming to 73 Thursday lows 50-48 warming back to 50 Wednesday 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 (40%) chance of showers tonight (under 0.10 in. of rain possible) and Friday (under 0.10 in. of rain possible), a slight (20%) chance of showers Friday night (under 0.10 in. of rain possible),
• Mostly cloudy with a slight (20%) chance of showers Saturday AM, partly cloudy with a slight (20%) chance of afternoon showers, partly cloudy with a slight (20%) chance of evening coastal showers, mostly clear late Saturday night,
• Sunny and a bit warner Sunday, mostly clear in the evening, then partly cloudy with a slight (20%) chance of showers late Sunday night.
• lows 52-50 highs 59-62.
• Then mostly cloudy with a (30%) chance of showers Monday through Thursday.
• highs near 62 lows 52-49 warming back to 52 Wednesday night. (seasonal averages high 61 low 50)

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Forecast for the Cascades in Lane County:

• Mostly cloudy with a good (50%) chance of showers tonight (under 0.10 in. of rain possible) and Friday AM, a bit cooler with showers likely (70%) in the afternoon (under 0.10 in. of rain possible), mostly cloudy with a good (50%) chance of evening showers, partly cloudy with a good (50%) chance of showers late Friday night,
• A mix of clouds and sun and a bit warmer with a good (50%) chance of showers Saturday afternoon, partly cloudy with a slight (20%) chance of evening showers, just partly cloudy late Saturday night and Sunday, then partly cloudy with a slight (20%) chance of showers Sunday night.
• snow level 7,500 ft. tonight, 6,000 ft. Friday, 5,500 ft. Friday night and Saturday, 7,500 ft. Saturday night, free air freezing level 10,000 ft. Sunday, then snow level above 8,000 ft. Sunday night.
• lows 38-33 warming to 39 Monday night highs 52-59.
• A mix of clouds and sun with a slight (20%) chance of AM showers, a bit cooler Monday afternoon with a (30%) chance of showers, mostly cloudy with a (40%) chance of showers at night and Tuesday AM, partly cloudy and a bit cooler with a (40%) chance of showers in the afternoon, a (30%) chance of showers Tuesday night,
• A mix of clouds and sun with a (40%) chance of showers and a bit warmer Wednesday, mostly cloudy with a (40%) chance of showers at night,
• Then a mix of clouds and sun with a (30%) chance of showers Thursday.
• snow level above 8,000 ft. Monday, 7,500 ft. Monday night, 6,000 ft. Tuesday and Tuesday night,  6,500 ft. Wednesday and Wednesday night, then 6,000 ft. Thursday.
• 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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