Here is my weekly weather quiz question. What is “Attenuation?”   The first person to post the correct answer as a comment on this page will win a week of free personalized weather forecasts tailored to your needs.  Good luck.

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An Upper Level High Pressure Ridge (Shaded “Arch” shape with blue arrows) has taken over returning the sunny skies and warming us up again. The graphics for days 1-3 show the next front that tries to move in Tuesday, but seems to go stationary just to our North. The graphics for days 3-7 show no frontal systems pushing through the Pacific Northwest through next Monday.

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Air Quality Index:

Eugene-Springfield: The Air Quality Index is 19 in the Good category measuring Particulate Matter.

Oakridge: The Air Quality Index is 19 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 15 in the Good category measuring Particulate Matter.

Data courtesy of Lane Regional Air Protection Agency (LRAPA)

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Home Wood Heating Advisory:

Eugene-Springfield: GREEN – Burning is Allowed.

Oakridge: GREEN – Burning is Allowed.

*Note: Pellet stoves may be used anytime if they produce no visible emissions.

Data courtesy of Lane Regional Air Protection Agency (LRAPA)

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Advisories:

• Permanent Health Advisory remains in effect for the South Umpqua River and Lawson Bar. Pools in the bedrock along the rivers edge are known to develop Blue-green Algae (cyanobacterial) blooms that can be harmful to pets and people if accidental ingestion occurs. Signs have been posted along several access areas along the river.

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

• Mostly clear tonight,
• Mostly sunny Wednesday, partly cloudy in the evening, increasing clouds to mostly cloudy with a slight (20%) chance of showers late Wednesday night (under 0.10 in. of rain possible),
• Mostly cloudy with AM rain, showers and a bit cooler Thursday afternoon (0.25 in. of rain possible), showers likely (60%) and colder Thursday night (0.10 in. of rain possible),
• Mostly cloudy with showers likely (60%) and a slight (20%) chance of thunderstorms Friday afternoon and evening, then showers likely (70%) at night.
• lows 43-52 cooling back to 42 Thursday night and Friday night highs 73-58.
• Mostly cloudy with showers likely (60%) and a bit cooler Saturday, cloudy with a good (50%) chance of showers Saturday night,
• Mostly cloudy with a good (50%) chance of showers Sunday (Mother’s Day), cloudy with a good (50%) chance of showers at night,
• Mostly cloudy with showers likely (70%) Monday, a good (50%) chance of showers at night,
• Then showers likely (70%) Tuesday.
• highs near 58 lows 42-45. (seasonal averages high 66 low 43)

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Eugene-Springfield Pollen Count:

Grass………. Moderate (12)

Trees………. Moderate (54)

Last Counted: 5/9/17

Data Courtesy of Oregon Allergy Associates.

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Forecast for Roseburg:

• Mostly clear tonight,
• Sunny Wednesday, partly cloudy in the evening, increasing clouds to mostly cloudy with a (30%) chance of rain Wednesday night,
• Mostly cloudy and colder with rain Thursday, evening showers, showers likely (70%) and much cooler late at night and Friday AM, then showers and a bit cooler in the afternoon and Friday night.
• lows 47-52 cooling to 44 Thursday night and Friday night highs 78-58.
• Mostly cloudy with showers and a bit cooler Saturday, a (30%) chance of showers Saturday night and (a bit warmer) Sunday (Mother’s Day), showers likely (60%) Sunday night and Monday, mostly cloudy with a (40%) chance of showers Monday night,
• Then showers likely (60%) and a but cooler Tuesday.
• highs 56-62 cooling to 58 Tuesday lows 42-45. (seasonal averages high 69 low 46)

 

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

• Mostly clear tonight,
• Cloudy Wednesday AM at the shore and sunny in the afternoon while sunny inland Wednesday, becoming mostly cloudy with a slight (20%) chance of evening coastal showers while rain likely (70%) inland late Wednesday night (under 0.10 in. of rain possible),
• Mostly cloudy and a bit cooler with rain Thursday (0.25 in. of rain possible), coastal showers at night while inland evening showers with inland showers likely (70%) late at night (0.25 in. of rain possible),
• Mostly cloudy with showers and a bit cooler Friday and Friday night.
• lows 47-50 cooling back to 47 Thursday night and Friday night highs 62-55.
• Mostly cloudy with showers likely (60%) Saturday, a (40%) chance of showers Saturday night and (a bit warmer) Sunday (Mother’s Day), then showers likely (70%) Sunday night through Tuesday (a bit cooler).
• highs 55-58 cooling to 56 Tuesday lows 43-46. (seasonal averages high 58 low 46)

 

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Forecast for the Cascades in Lane County:

• Mostly clear tonight,
• Mostly sunny Wednesday AM, becoming partly cloudy with a slight (20%) chance of showers in the afternoon, a slight (20%) chance of evening showers and thunderstorms, mostly cloudy with a slight (20%) chance of showers late Wednesday night,
• Mostly cloudy with rain and colder Thursday, rain and snow showers likely (70%) and colder at night,
• AM rain and snow showers likely (70%), rain and snow showers likely (70%) and a slight (20%) chance of thunderstorms and a bit cooler Friday afternoon, then rain and snow showers likely (70%) Friday night.
• free air freezing level 11,000 ft. tonight, snow level above 8,000 ft. Wednesday and Wednesday night, 6,500 ft. Thursday, 4,500 ft. Thursday night, then 4,000 ft. Friday and Friday night.
• lows 34-38 cooling to 28 Friday night highs 68-42.
• Rain and snow showers likely (70%) Saturday and Saturday night,
• A mix of clouds and sun and a bit warmer with a (40%) chance of showers Sunday (Mother’s Day), mostly cloudy with a (40%) chance of rain and snow showers at night,
• Mostly cloudy with rain and snow showers likely (70%) Monday through Tuesday (a bit cooler).
• snow level 3,500 ft. Saturday, 4,500 ft. Saturday night, 4,000 ft. Sunday, 5,000 ft. Sunday night, 4,500 ft. Monday, 4,000 ft. Monday night, then 3,500 ft. Tuesday.
• highs 42-44 cooing to 40 Tuesday lows near 30.

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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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