Here is my new 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 show the frontal system that brought rain chances back and the next front approaching today. The graphics for days 3-7 show not much frontal activity for the week. The upper low will be the main instrument of rain for the Pacific Northwest.

Note: Willamette Pass, Hoodoo, and Mt. Ashland are all closed for the season. Check out their websites for any deals on events and lift tickets for next year.

 

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Air Quality Index:

Eugene-Springfield: The Air Quality Index is 2 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:

• A WINTER WEATHER ADVISORY IS IN EFFECT UNTIL 8 PM THIS EVENING FOR THE NORTHERN OREGON CASCADES AND THE CASCADES IN LANE COUNTY.
• A WINTER WEATHER ADVISORY IS IN EFFECT UNTIL 11 PM TONIGHT FOR THE SOUTH CENTRAL OREGON CASCADES, THE SOUTHERN OREGON CASCADES, AND THE SISKIYOU MOUNTAINS.
• 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 evening showers likely (70%) tapering off to a slight (20%) chance of showers late tonight (0.10 in. of rain possible),
• Cloudy with a good (50%) chance of AM rain, mostly cloudy with rain Tuesday afternoon (0.10 in. of rain possible), showers at night (0.50 in. of rain possible),
• Mostly cloudy with rain Wednesday (0.25 in. of rain possible), a good (50%) chance of evening showers, a slight (20%) chance of showers Wednesday night (under 0.10 in. of rain possible),
• Mostly cloudy with a good (50%) chance of showers and a bit warmer Thursday, then a (40%) chance of showers at night.
• lows 44-48 cooling to 38 Thursday night highs near 57.
• Partly cloudy with a slight (20%) chance of showers and a bit warmer Friday, just partly cloudy Friday night through Saturday night,
• A mix of clouds and sun with a slight (20%) chance of showers and a bit cooler Sunday, partly cloudy with a slight (20%) chance of showers at night,
• Then a mix of clouds and sun and a bit cooler with a slight (20%) chance of showers Monday.
• highs 58-63 cooling to 60 Monday lows 38-42. (seasonal averages high 62 low 40)

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Eugene-Springfield Pollen Count:

Grass………. Low (3)

Trees………. Moderate (38)

Last Counted: 4/21/17

Data Courtesy of Oregon Allergy Associates.

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Forecast for Roseburg:

• Cloudy with increasing evening showers, isolated showers late late tonight (under 0.10 in. of rain possible),
• Cloudy with a good (50%) chance of AM rain, rain likely (70%) Tuesday afternoon (0.10 in. of rain possible), increasing showers late at night (0.25 in. of rain possible),
• Mostly cloudy with AM rain, coastal showers likely (70%) Wednesday afternoon while inland showers in the afternoon (0.50 in. of rain possible), a slight (20%) chance of showers Wednesday night,
• Then mostly cloudy with a slight (20%) chance of showers Thursday and at night (under 0.10 in. of rain possible).
• lows 43-52 cooling to 39 Thursday night highs near 58.
• Partly cloudy with a slight (20%) chance of showers and a bit warmer Friday, just partly cloudy at night through Sunday night,
• Then mostly cloudy and a bit cooler with a slight (20%) chance of showers Monday.
• highs 62-68 cooling to 65 Monday lows 40-46. (seasonal averages high 64 low 43)

 

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

• Cloudy with increasing evening showers, isolated showers likely (70%) late tonight (under 0.10 in. of rain possible),
• Cloudy with a good (50%) chance of AM rain, rain likely (70%) Tuesday afternoon (0.50 in. of rain possible), showers at night (0.50 in. of rain possible),
• AM rain Wednesday, mostly cloudy with coastal showers likely (60%) in the afternoon while inland afternoon showers (0.25 in. of rain possible), a slight (20%) chance of showers Wednesday night (under 0.10 in. of rain possible),
• Then mostly cloudy with a slight (20%) chance of showers Thursday and at night.
• lows 46-52 cooling to 42 Thursday night highs near 55.
• Partly cloudy with a slight (20%) chance of showers and a bit warmer Friday, just partly cloudy Friday night through Sunday night,
• Then mostly cloudy and a bit cooler with a slight (20%) chance of showers Monday.
• highs 58-60 cooling to 57 Monday lows 43-46. (seasonal averages high 56 low 44)

 

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Forecast for the Cascades in Lane County:

• Mostly cloudy with rain and snow showers this evening, a good (50%) chance of rain and snow showers late tonight (0.25 in. of rain possible, 1-4 in. of snow possible),
• Cloudy with a good (50%) chance of AM rain and snow, rain and snow and a bit warmer Tuesday afternoon (0.10 in. of rain possible, 1 in. of snow possible), showers Tuesday night (0.75 in. of rain possible),
• AM rain, showers and a bit cooler Wednesday afternoon, rain and snow showers and colder at night,
• Mostly cloudy with rain and snow showers likely (70%) and a bit cooler Thursday and Thursday night.
• snow level 4,000 ft. tonight, 3,500 ft. rising to 5,000 ft. Tuesday afternoon, 6,500 ft. Tuesday night 6,000 ft. Wednesday, 4,000 ft. Wednesday night, 3,500 ft. Thursday, then 4,000 ft. Thursday night.
• lows 30-33 cooling to 25 Thursday night highs 43-38.
• A mix of clouds and sun and a bit warmer with a good (50%) chance of rain and snow showers Friday, just partly cloudy Friday night through Saturday night (a bit warmer Saturday),
• A mix of clouds and sun with a slight (20%) chance of showers Sunday, mostly cloudy with a slight (20%) chance of showers at night,
• Then a mix of clouds and sun and a bit cooler with a slight (20%) chance of showers Monday.
• snow level 3,500 ft. Friday, free air freezing level 5,000 ft. Friday night, 5,500 ft. Saturday, 8,000 ft. Saturday night, snow level 7,000 ft. Sunday and Sunday night, then 6,000 ft. Monday.
• highs 42-50 cooling to 47 Monday lows 23-30.

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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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