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) took over producing sunny skies and warm temperatures. The graphics for days 1-3 show the next frontal system that will approach the Pacific Northwest tonight and Thursday. An Upper Level Low Pressure Trough (Shaded “U” shape with blue arrows) will move out of the Gulf of Alaska behind the frontal system to keep the rain chances with us. The graphics for days 3-7 show no frontal systems pushing into or through the Pacific Northwest through next Wednesday.

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Air Quality Index:

Eugene-Springfield: The Air Quality Index is 28 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 1 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:

• Increasing clouds to mostly cloudy with a slight (20%) chance of rain this evening, rain late tonight (0.10 in. of rain possible) and Thursday AM, showers and much cooler with a slight (20%) chance of thunderstorms in the afternoon (0.25 in. of rain possible) and evening, showers likely (60%) and colder late Thursday night (0.10 in. of rain possible),
• AM showers likely (70%), mostly cloudy and a bit cooler with showers and a slight (20%) chance of thunderstorms Friday afternoon and evening, showers likely (70%) late at night,
• Mostly cloudy with AM showers likely (60%), showers with a slight (20%) chance of thunderstorms Saturday afternoon, evening showers likely (70%), then a good (50%) chance of showers late Saturday night.
• lows 52-42 highs 58-56.
• Cloudy with a good (50%) chance of showers and a bit warmer Sunday (Mother’s Day), mostly cloudy with a good (50%) chance of showers at night and Monday (a bit cooler), cloudy with a good (50%) chance of showers Monday night,
• Mostly cloudy and a bit warmer with a good (50%) chance of showers Tuesday, cloudy with a good (50%) chance of showers at night,
• Then mostly cloudy and a bit warmer with a (30%) chance of showers Wednesday.
• highs 59-56 warming to 60 Wednesday lows 43-40. (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:

• Partly cloudy this evening, increasing clouds to mostly cloudy with rain late tonight,
• Mostly cloudy with AM rain, colder with showers and a slight (20%) chance of thunderstorms Thursday afternoon, evening showers likely (70%) with a slight (20%) chance of thunderstorms, much cooler with a good (50%) chance of showers late Thursday night,
• Mostly cloudy with showers Friday AM, showers and a bit cooler with a slight (20%) chance of thunderstorms in the afternoon and evening, showers late Friday night,
• Mostly cloudy with showers and a bit cooler Saturday, then a (40%) chance of showers Saturday night.
• lows 52-44 cooling to 42 Saturday night highs 60-56.
• Mostly cloudy with a (40%) chance of showers and a bit warmer Sunday (Mother’s Day) and Sunday night,
• A slight (20%) chance of AM showers, showers likely (70%) and a bit cooler Monday through Tuesday night,
• Then mostly cloudy and warmer with a (40%) chance of showers Wednesday.
• highs 58-53 warming to 62 Wednesday lows 42-45 cooling back to 42 Tuesday night. (seasonal averages high 69 low 46)

 

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

• Mostly cloudy with a slight (20%) chance of evening coastal rain, rain late tonight (under 0.10 in. of rain possible),
• Mostly cloudy with rain Thursday AM, showers with a slight (20%) chance of afternoon thunderstorms and a bit cooler (0.25 in. of rain possible), coastal showers with a slight (20%) chance of thunderstorms in the evening while inland showers likely (70%) with a slight (20%) chance of thunderstorms in the evening, showers likely (70%) late Thursday night (0.25 in. of rain possible),
• Mostly cloudy with AM showers, a bit cooler with showers and a slight (20%) chance of thunderstorms Friday afternoon, showers at night,
• Mostly cloudy with AM showers likely (70%), showers Saturday afternoon, then a (40%) chance of showers at night.
• lows 50-47 highs 56-52 warming back to 56 Sunday.
• Mostly cloudy with a (30%) chance of showers and a bit warmer Sunday (Mother’s Day) and Sunday night,
• A good (50%) chance of AM showers, showers Monday afternoon and evening,
• Mostly cloudy with showers likely (70%) Tuesday and in the evening, then a (40%) chance of showers Tuesday night and Wednesday.
• highs 55-53 warming to 57 Wednesday lows near 46. (seasonal averages high 59 low 46)

 

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Forecast for the Cascades in Lane County:

• Partly cloudy with a slight (20%) chance of evening showers and thunderstorms, mostly cloudy with a good (50%) chance of showers late tonight (0.10 in. of rain possible, more in storms),
• Mostly cloudy with AM rain, showers and colder Thursday (0.50 in. of rain possible) and at night,(0.10 in. of rain possible, 1-2 in. of snow possible),
• AM showers likely (70%), showers with a slight (20%) chance of thunderstorms and a bit cooler Friday afternoon and evening, showers Friday night,
• Showers and a bit cooler Saturday with a slight (20%) chance of afternoon thunderstorms, then showers Saturday night.
• snow level above 8,000 ft. tonight, 6,500 ft. Thursday, 5,000 ft. Thursday night, 4,000 ft. Friday and Friday night, 3,500 ft. Saturday, then 4,500 ft. Saturday night.
• lows 38-28 highs 48-40.
• Mostly cloudy and a bit warmer with a good (50%) chance of rain and snow showers Sunday (Mother’s Day), a good (50%) chance of rain and snow showers at night and Monday, showers likely (70%) Monday night through Tuesday night,
• Then mostly cloudy with a good (50%) chance of showers and a bit warmer Wednesday.
• snow level 4,000 ft. Sunday, 5,000 ft. Sunday night, 4,500 ft. Monday and Monday night, 3,500 ft. Tuesday, 4,500 ft. Tuesday night, then 4,000 ft. Wednesday.
• highs 42-39 warming back to 42 Wednesday 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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