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. That will allow cooler moist air to move inland from the coast.  A frontal system (position shown is Wednesday) will be pushing through the Pacific Northwest Tuesday and Wednesday giving us at least a slight chance of showers starting Wednesday.

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Air Quality Index:

Eugene-Springfield: The Air Quality Index is 37 in the Good category measuring Particulate Matter.

Oakridge: The Air Quality Index is 25 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 30 in the Good category measuring Particulate Matter.

Data courtesy of Lane Regional Air Protection Agency (LRAPA).

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Advisories:

• A HEAT ADVISORY IS IN EFFECT UNTIL 8 PM TODAY FOR EASTERN CURRY COUNTY, JOSEPHINE COUNTY, JACKSON COUNTY,  THE SOUTH CENTRAL OREGON CASCADES, THE SOUTHERN OREGON CASCADES AND THE SISKIYOU MOUNTAINS.
• A FLASH FLOOD WATCH IS IN EFFECT FROM 3 PM THIS AFTERNOON THROUGH LATE TONIGHT FOR THE SOUTH CENTRAL OREGON CASCADES, THE SOUTHERN OREGON CASCADES, THE SISKIYOU MOUNTAINS AND THE KLAMATH BASIN.

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Forecast for the Southern and lower Mid Willamette Valley including Eugene-Springfield and Albany-Corvallis:

• Mostly sunny and a bit cooler, but still very warm this afternoon, mostly clear tonight,
• A mix of clouds and sun and a bit cooler Tuesday, partly cloudy in the evening, mostly cloudy late at night,
• Mostly cloudy and a bit cooler with a slight (20%) chance of showers Wednesday and Wednesday night.
• highs 90-73 lows 54-52.
• A mix of clouds and sun and a bit cooler with a slight (20%) chance of showers Thursday, mostly cloudy with a (40%) chance of showers Thursday night,
• A good (50%) chance of showers Friday and Friday night,
• Mostly cloudy with a (40%) chance of showers and a bit warmer Saturday and Saturday night,
• Then a mix of clouds and sun and a bit warmer with a slight (20%) chance of showers Sunday.
• highs 69-63 warming to 68 Sunday lows 49-47. (seasonal averages high 71 low 46.)

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Eugene-Springfield Pollen Count:

Grass………. Very High (233)

Trees………. Moderate (51)

Last Counted: 6/3/16

Data Courtesy of Oregon Allergy Associates.

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Forecast for Roseburg:

• Sunny and a bit cooler with a slight (20%) chance of showers and thunderstorms this afternoon, mostly clear with a slight (20%) chance of evening thunderstorms, partly cloudy with a slight (20%) chance of thunderstorms late tonight,
• Partly cloudy with a slight (20%) chance of thunderstorms Tuesday afternoon and in the evening, just mostly cloudy late Tuesday night,
• Mostly cloudy and a bit cooler with a slight (20%) chance of showers Wednesday and Wednesday night.
• highs 95-79 lows 63-52.
• Mostly cloudy with a slight (20%) chance of showers Thursday, partly cloudy with a slight (20%) chance of showers in the afternoon and evening, mostly cloudy with a (30%) chance of showers at night and Friday AM, a (40%) chance of showers and a slight (20%) chance of thunderstorms in the afternoon and evening, a (40%) chance of showers late at night,
• Mostly cloudy with a (30%) chance of showers Saturday and Saturday night,
• Partly cloudy with a slight (20%) chance of showers Sunday AM, then mostly cloudy with a slight (20%) chance of showers Sunday afternoon.
• highs 72-68 warming to 72 Sunday lows 50-47 warming back to 50 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 tonight,
• Mostly cloudy Tuesday AM, partly cloudy in the afternoon and evening, mostly cloudy with late Tuesday night,
• Then mostly cloudy with a (30%) chance of showers Wednesday and in the evening, partly cloudy with a slight (20%) chance of showers late Wednesday night.
• highs near 65 lows 56-52.
• Partly cloudy with a slight (20%) chance of showers Thursday AM, mostly cloudy and a bit cooler with a slight (20%) chance of showers in the afternoon, mostly cloudy with a (30%) chance  of showers Thursday night and Friday AM, a (30%) chance of showers and a slight (20%) chance of thunderstorms in the afternoon and evening, a (40%) chance of showers late Friday night through Saturday night,
• Then mostly cloudy with a slight (20%) chance of showers Sunday.
• 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 this afternoon, a (40%) chance of showers and thunderstorms this evening, a slight (20%) chance of showers and thunderstorms late tonight,
• Partly cloudy with a good (50%) chance of showers and thunderstorms and a bit cooler Tuesday afternoon, mostly cloudy with a (40%) chance of showers and thunderstorms in the evening, just mostly cloudy late Tuesday night,
• A mix of clouds and sun and a bit cooler Wednesday with a slight (20%) chance of showers in the afternoon, mostly cloudy with a slight (20%) chance of showers Wednesday night.
• snow level above 8,000 ft. today through Wednesday night.
• highs 82-65 lows 53-42.
• A mix of clouds and sun and a bit cooler with a slight (20%) chance of showers Thursday, mostly cloudy with a (30%) chance of showers Thursday night,
• A mix of clouds and sun with a (40%) chance of showers and a bit cooler Friday, mostly cloudy a (40%) chance of showers Friday night,
• A mix of clouds and sun and a bit cooler with a (40%) chance of showers Saturday, partly cloudy with a (30%) chance of showers Saturday night,
• Then a mix of clouds and sun and a bit warmer with a slight (20%) chance of showers Sunday.
  snow level above 8,000 ft. Thursday, 7,500 ft. Thursday night, 6,500 ft. Friday, 5,500 ft. Friday night and Saturday, 6,500 ft. Saturday night, then 8,000 ft. Sunday.
• highs 62-49 warming to 55 Sunday lows 39-34 warming to 36 Saturday 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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