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 8 in the Good category measuring Particulate Matter.

Oakridge: The Air Quality Index is 24 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 6 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 near 42 highs 56-59 cooling to 56 Monday.
• Mostly cloudy and a bit cooler 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 Thursday afternoon through Friday.
• highs 58-56 warming to 66 Thursday lows 44-42. (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 cloudy with showers and a slight (20%) chance of thunderstorms this evening, showers late tonight (snow level 3,500 ft.),
• Mostly cloudy with showers Saturday (AM snow level 3,500 ft.), a (40%) chance of showers at night,
• Mostly cloudy with a (40%) chance of showers and a bit warmer Sunday (Mother’s Day) and Sunday night,
• Mostly cloudy and a bit cooler with a (40%) chance of showers Monday, evening rain likely (70%), then rain late Monday night.
• lows near 43 highs 56-62.
• AM showers, mostly cloudy with showers likely (70%) and a bit cooler Tuesday afternoon and evening, a good (50%) chance of showers late at night,
• Mostly cloudy and warmer with a (40%) chance of showers Wednesday, a slight (20%) chance of evening showers, partly cloudy with a (30%) chance of showers late Wednesday night and Thursday,
• highs 59-54 warming to 68 Thursday lows 44-42 warming back to 44 Wednesday night. (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 AM coastal showers likely (70%) and coastal showers Saturday afternoon while inland showers Saturday (0.25 in. of rain possible), a (40%) chance of showers at night (under 0.10 in. of rain possible),
• Mostly cloudy with a (30%) chance of showers and a bit warmer Sunday (Mother’s Day) and Sunday night,
• Mostly cloudy with a good (50%) chance of showers and a bit cooler Monday, then evening rain likely (70%), rain late at night.
• lows 46-44 highs 54-56.
• Mostly cloudy with AM showers, showers likely (70%) and a bit cooler Tuesday afternoon and in the evening, a (40%) chance of showers Tuesday night and Wednesday (a bit warmer), a slight (20%) chance of evening showers, partly cloudy and a bit warmer late Wednesday night and Thursday,
• highs 55-58 lows 47-45 warming back to 47 Wednesday night. (seasonal averages high 59 low 47)

 

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Forecast for the Cascades in Lane County:

• Mostly cloudy with evening showers with a slight (20%) chance of thunderstorms, showers late tonight (0.25 in. of rain possible, 1-4 in. of snow possible),
• Showers and a bit cooler Saturday, shower chances decreasing Saturday night,
• Mostly cloudy and a bit warmer with showers increasing Sunday (Mother’s Day), showers decreasing to  a good (50%) chance of showers at night,
• Mostly cloudy with showers Monday, then rain and snow showers Monday night.
• snow level 4,000 ft. tonight, 3,500 ft. Saturday, 4,000 ft. Saturday night and Sunday, 4,500 ft. Sunday night, 4,500 ft. Monday, then 5,000 ft. Monday night.
• lows near 28 highs 42-39 warming back to 42 Sunday.
• Showers Tuesday, showers likely (70%) at night,
• Mostly cloudy with a good (50%) chance of showers and a bit warmer Wednesday, a (40%) chance of showers Wednesday night,
• Then a mix of clouds and sun Thursday.
• snow level 4,000 ft. Tuesday, 3,500 ft. Tuesday night, 3,500 ft. warming to 5,000 ft. Wednesday afternoon, 5,000 ft. rising to 7,000 ft. late Wednesday night, free air freezing level 8,000 ft. Thursday,
• highs 42-38 warming to 52 Thursday lows 30-32.

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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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