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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The graphics for days 1-3 show the frontal system that moved through the Pacific Northwest 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 a frontal system pushing into or through the Pacific Northwest Monday and next Friday.

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Air Quality Index:

Eugene-Springfield: The Air Quality Index is 3 in the Good category measuring Particulate Matter.

Oakridge: The Air Quality Index is 8 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 0 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:

• A 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 cloudy with showers and a slight (20%) chance of thunderstorms with small hail possible this evening (0.25 in. of rain possible, more in storms), showers continue late tonight (0.25 in. of rain possible) and Saturday (0.25 in. of rain possible), evening showers likely (70%), a good (50%) chance of showers late Saturday night (0.10 in. of rain possible),
• Mostly cloudy with a good (50%) chance of showers and a bit warmer Sunday (Mother’s Day), a (40%) chance of showers at night,
• Cloudy with a good (50%) chance of AM showers, a bit cooler with rain likely (70%) Monday afternoon, evening rain, then showers late Monday night.
• lows 42-45 highs 56-59 cooling to 56 Monday.
• Mostly cloudy with showers likely (70%) Tuesday, a good (50%) chance of showers Tuesday night,
• Mostly cloudy and a bit warmer with the chance of showers decreasing to (50%) Wednesday, a slight (20%) chance of evening showers,  mostly cloudy late at night,
• Mostly cloudy start, then partly cloudy and a bit warmer Thursday afternoon through Friday.
• highs 58-69 lows 43-46. (seasonal averages high 66 low 43)

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Eugene-Springfield Pollen Count:

Grass………. Moderate (19)

Trees………. Moderate (73)

Last Counted: 5/10/17

Data Courtesy of Oregon Allergy Associates.

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Forecast for Roseburg:

• Mostly cloudy with showers and a slight (20%) chance of thunderstorms this evening, showers likely (70%) late tonight (gusty winds & small hail possible, snow level 3,500 ft.),
• Mostly cloudy with AM showers likely (70%) Saturday (AM snow level 3,000 ft. rising to 3,500 ft.), showers in the afternoon, cloudy with a (40%) chance of showers at night,
• Mostly cloudy with a (30%) chance of showers (snow level 3,000 ft. rising to 3,500 ft. in the afternoon) and a bit warmer Sunday (Mother’s Day) and Sunday night (snow level 3,500 ft. late at night),
• Cloudy and a bit cooler with a good (50%) chance of showers Monday, evening rain likely (70%), then rain late Monday night.
• lows near 43 highs 57-62 cooling back to 57 Monday.
• Mostly cloudy with AM rain, showers likely (70%) and a bit cooler Tuesday afternoon and evening, a good (50%) chance of showers late at night and Wednesday (a bit warmer), a slight (20%) chance of showers Wednesday night,
• Mostly cloudy Thursday AM, then partly cloudy Thursday afternoon through Friday.
• highs 55-73 lows near 44. (seasonal averages high 69 low 47)

 

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

• Mostly cloudy with showers tonight (0.50 in. of rain possible),
• Mostly cloudy with coastal showers showers Saturday while AM inland showers likely (70%) Saturday and inland showers in the afternoon (0.25 in. of rain possible), evening coastal showers likely (70%) and a good (50%) chance of coastal showers late Saturday night while a good (50%) chance of inland showers at night (under 0.10 in. of rain possible),
• Mostly cloudy with a (40%) chance of showers and a bit warmer Sunday (Mother’s Day), a (30%) chance of showers Sunday night,
• Mostly cloudy with a good (50%) chance of showers and a bit cooler Monday, then rain at night.
• lows 46-44 warming back to 46 Mondays night highs 54-56.
• Mostly cloudy with AM rain, showers likely (70%) and a bit cooler Tuesday afternoon and in the evening, a good (50%) chance of showers Tuesday night,
• Mostly cloudy with  slight (20%) chance of showers and a bit warmer Wednesday and Wednesday night,
• Mostly  cloudy Thursday AM, then partly cloudy and a bit warmer Thursday afternoon through Friday.
• highs 54-64 lows 45-47. (seasonal averages high 59 low 47)

 

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Forecast for the Cascades in Lane County:

• Mostly cloudy with evening showers and a slight (20%) chance of thunderstorms with small hail possible, showers late tonight (0.25 in. of rain possible, 1-4 in. of snow possible) and Saturday (0.25 in. of rain possible, 1-4 in. of snow possible), shower chances decreasing to (40%) late Saturday night,
• Mostly cloudy and a bit warmer with a good (50%) chance of showers Sunday (Mother’s Day), showers chances decreasing to  a good (50%) chance of showers at night,
• Mostly cloudy with a (40%) chance of showers Monday AM, showers likely (70%) and a bit cooler in the afternoon, evening rain or snow, then showers late Monday night.
• snow level 3,500 ft. tonight and Saturday, 4,000 ft. Saturday night, 3,500 ft. Sunday, 4,500 ft. Sunday night, 4,000 ft. Monday, then 4,500 ft. Monday night.
• lows 28-30 highs 39-42.
• Mostly cloudy with showers and a bit cooler Tuesday, cloudy with showers late at night,
• A good (50%) chance of showers and a bit warmer Wednesday, a (40%) chance of showers Wednesday night,
• A mix of clouds and sun and a bit warmer Thursday, then partly cloudy and a bit warmer Thursday night and Friday.
• snow level 3,500 ft. Tuesday and Tuesday night, 4,000 ft. Wednesday afternoon, 5,000 ft. Wednesday night, free air freezing level 8,000 ft. Thursday, then 9,000 ft. Thursday night and Friday.
• highs 37-56 lows 28-32.

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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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