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 Low Pressure Trough (Shaded “U” shape with blue arrows) is controlling our weather. The graphics for days 1-3 shows the front that moved through the Pacific Northwest. The graphics for days 3-7 show the next frontal system that approaches Sunday and the another one next Wednesday.

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Air Quality Index:

Eugene-Springfield: The Air Quality Index is 5 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 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:

• Mostly cloudy with a good (50%) chance of evening showers, a slight (20%) chance of showers late tonight (under 0.10 in. of rain possible),
• Mostly cloudy with a good (50%) chance of AM showers, showers likely (70%) Thursday afternoon (0.10 in. of rain possible), a good (50%) chance of evening showers, partly cloudy with a slight (20%) chance of showers late at night (under 0.10 in. of rain possible),
• Partly cloudy and a bit warmer Friday through Saturday, then partly cloudy with a slight (20%) chance of rain Saturday night,
• lows 43-36 warming to 44 Saturday night highs 57-65.
• Mostly cloudy and a bit cooler with a (40%) chance of showers Sunday, partly cloudy with a slight (20%) chance of showers at night,
• A mix of clouds and sun and a bit warmer Monday, partly cloudy with a slight (20%) chance of showers Monday night and Tuesday (a bit warmer), then just partly cloudy Tuesday night and Wednesday (a bit warmer).
• highs 60-70 lows 40-42. (seasonal averages high 63 low 41)

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Eugene-Springfield Pollen Count:

Grass………. Moderate (5)

Trees………. High (110)

Last Counted: 4/26/17

Data Courtesy of Oregon Allergy Associates.

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Forecast for Roseburg:

• Mostly cloudy with a slight (20%) chance of showers tonight,
• Mostly cloudy and a bit warmer with a (30%) chance of showers Thursday (under 0.10 in. of rain possible, snow level 3,500 ft. in the afternoon), a (30%) chance of showers at night (under 0.10 in. of rain possible, evening snow level 3,500 ft.),
• Partly cloudy and a bit warmer Friday, mostly clear in the evening, partly cloudy late Friday night,
• Partly cloudy and a bit warmer Saturday and in the evening, mostly cloudy with a (40%) chance of showers at night.
• lows 43-38 warming to 49 Saturday night highs 56-60.
• Mostly cloudy and a bit cooler with a (30%) chance of showers Sunday, partly cloudy with a slight (20%) chance of showers Sunday night,
• Mostly cloudy and a bit warmer Monday, mostly cloudy with a slight (20%) chance of showers Monday night and Tuesday (a bit warmer), just partly cloudy at night,
• Then sunny and a bit warmer Wednesday.
• highs 62-72 lows 43-46. (seasonal averages high 65 low 44)

 

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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 showers tonight (under 0.10 in. of rain possible),
• Mostly cloudy with a slight (20%) chance of showers Thursday and in the evening (under 0.10 in. of rain possible), just mostly cloudy late at night,
• Partly cloudy and a bit warmer Friday through Saturday, partly cloudy with a (30%) chance of evening showers, then mostly cloudy with a (40%) chance of showers late Saturday night.
• lows 45-42 warming to 48 Saturday night highs 56-60.
• Mostly cloudy and a bit cooler with a (30%) chance of showers Sunday, just partly cloudy Sunday night,
• Mostly cloudy and a bit warmer Monday, then a slight (20%) chance of showers Monday night and Tuesday (a bit warmer), partly cloudy Tuesday night,
• Then sunny and a bit warmer Wednesday.
• highs 56-64 lows 44-47. (seasonal averages high 57 low 44)

 

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Forecast for the Cascades in Lane County:

• Mostly cloudy with evening rain and snow showers likely (70%) decreasing to a (40%) chance of rain and snow showers and colder late tonight (0.10 in. of rain possible, 2 in. of snow possible),
• Mostly cloudy with rain and snow showers and a bit cooler Thursday (0.25 in. of rain possible, 1-3 in. of snow possible), evening rain and snow showers likely (70%), a good (50%) chance of rain and snow showers late at night (0.10 in. of rain possible, 1 in. of snow possible),
• Partly cloudy with a (30%) chance of AM snow showers, a slight (20%) chance of rain and snow showers and a bit warmer Friday afternoon, just partly cloudy Friday night and Saturday (a bit warmer), then partly cloudy with a slight (20%) chance of rain Saturday night.
• snow level 4,500 ft. falling to 3,500 ft. late tonight, 3,000 ft. rising to 4,000 ft. Thursday, 4,000 ft. Thursday night, 3,000 ft. Friday AM, free air freezing level 6,000 ft. Friday night, 7,000 ft. Saturday, then snow level 7,000 ft. Saturday night.
• lows 26-23 warming to 32 Saturday night highs 38-52.
• A mix of clouds and sun and a bit cooler with a slight (20%) chance of showers Sunday, just partly cloudy Sunday night,
• Mostly cloudy and a bit warmer with a (40%) chance of showers Monday, a slight (20%) chance of rain and snow showers at night,
• Partly cloudy with a slight (20%) chance of showers and a bit cooler Tuesday, then just partly cloudy Tuesday night and Wednesday (a bit warmer).
• snow level 7,000 ft. Sunday, 5,000 ft. Sunday night, free air freezing level 6,000 ft. Monday, snow level 5,500 ft. Monday night, 7,000 ft. Tuesday, free air freezing level 9,000 ft. Tuesday night, then 11,000 ft Wednesday.
• highs 52-57 lows 30-33.

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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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