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. A 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 54 in the Moderate category measuring Particulate Matter.

Oakridge: The Air Quality Index is 18 in the Good category measuring Ozone.

Cottage Grove: The Air Quality Index is 51 in the Moderate category measuring Ozone.

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 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 clear tonight,
• Partly cloudy 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.
• A mix of clouds and sun and a bit cooler with a slight (20%) chance of showers Thursday, then mostly cloudy with a good (50%) chance of showers Thursday night,
• lows 56-50 highs 87-70.
• Mostly cloudy with a good (50%) chance of showers and a bit cooler Friday and Friday night,
• A mix of clouds and sun with a (40%) chance of showers and a bit warmer Saturday, 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 at night,
• A slight (20%) chance of showers Monday morning, then a mix of clouds and sun with a (30%) chance of showers Monday afternoon.
• highs 65-72 lows 48-50. (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:

• Mostly clear with a slight (20%) chance of evening thunderstorms tonight,
• Partly cloudy and a bit cooler with a slight (20%) chance of thunderstorms Tuesday afternoon and in the evening, just partly cloudy late Tuesday night,
• Mostly cloudy with a slight (20%) chance of AM thunderstorms, a bit cooler with a slight (20%) chance of showers Wednesday afternoon, mostly cloudy with a slight (20%) chance of evening showers, partly cloudy with a slight (20%) chance of showers late Wednesday night,
• Partly cloudy and a bit cooler with a slight (20%) chance of showers Thursday, partly cloudy with a (30%) chance of showers in the evening, mostly cloudy with a (30%) chance of showers Thursday night.
• lows 60-50 highs 93-72.
• 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 showers and 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 tonight,
• Partly cloudy Tuesday and in the evening, mostly cloudy with a slight (20%) chance of coastal showers late Tuesday night,
• 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.
• Partly cloudy with a slight (20%) chance of showers Thursday, then mostly cloudy with a (30%) chance of showers Thursday night.
• lows 55-57 cooling to 50 Thursday night highs 65-63.
• Mostly cloudy with a (30%) chance of showers 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,
• 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 (40%) chance of showers and thunderstorms this evening, a slight (20%) chance of showers and thunderstorms late tonight (0.10 in. of rain possible, more in storms) and Tuesday AM, a (40%) chance of showers and thunderstorms and a bit cooler in the afternoon (0.25 in. of rain possible, more in storms), mostly cloudy with a (30%) chance of showers and thunderstorms in the evening, just partly cloudy late Tuesday night,
• A mix of clouds and sun with a slight (20%) chance of showers Wednesday AM, a (30%) chance of showers and a slight (20%) chance of thunderstorms and a bit cooler in the afternoon (gusty winds and small hail possible), partly cloudy 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 and thunderstorms, then mostly cloudy with a (40%) chance of showers late Thursday night.
• snow level above 8,000 ft. tonight through Thursday night.
• lows 52-39 highs 80-62.
• 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 Saturday, partly cloudy with a (40%) chance of evening rain and snow showers in the 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, 6,000 ft. Friday night through Saturday night, 6,500 ft. Sunday, then above 8,000 ft. Sunday night and Monday.
• highs 53-62 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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