Here is my weekly weather quiz question for the last time. What is “ Astronomical Dawn?”Here is the correct answer. Astronomical Dawn is the time at which the sun is 18 degrees below the horizon in the morning. Astronomical dawn is that point in time at which the sun starts lightening the sky. Prior to this time during the morning, the sky is completely dark. I’ll have a new weekly weather quiz question for you Monday.  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 Monday. 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 5 in the Good category measuring Particulate Matter.

Oakridge: The Air Quality Index is 10 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 FROM 8 PM THIS EVENING UNTIL 8 PM MONDAY FOR THE NORTHERN OREGON CASCADES AND THE CASCADES IN LANE COUNTY.
• A WINTER STORM WARNING IS IN EFFECT FROM 11 PM THIS EVENING UNTIL 11 PM MONDAY FOR THE SOUTH CENTRAL OREGON CASCADES.
• A WINTER WEATHER ADVISORY IS IN EFFECT FROM 11 PM THIS EVENING UNTIL 11 PM MONDAY 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 showers likely (70%) this evening, rain late tonight (0.50 in. of rain possible) and Monday AM, showers and a bit cooler in the afternoon (0.50 in. of rain possible) and breezy (Wind: S 15-25 mph gusts to 35 mph), evening showers likely (70%), a slight (20%) chance of showers late Monday night (0.10 in. of rain possible),
• Mostly cloudy with rain Tuesday (0.25 in. of rain possible), showers Tuesday night (0.25 in. of rain possible) and Wednesday, then mostly cloudy with a good (50%) chance of showers at night.
• lows near 45 highs near 55.
• Mostly cloudy with a good (50%) chance of showers and a bit warmer Thursday and Thursday night,
• Cloudy with a good (50%) chance of showers and a bit warmer Friday, partly cloudy Friday night through Saturday night,
• Then a mix of clouds and sun and a bit warmer Sunday.
• highs 58-69 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:

• Mostly cloudy with rain late tonight (0.50 in. of rain possible) and Monday AM, showers and a bit cooler in the afternoon (0.50 in. of rain possible), cloudy with evening showers likely (70%), a good (50%) chance of showers late Monday night (0.25 in. of rain possible),
• Rain and a bit warmer Tuesday (0.25 in. of rain possible), evening showers likely (70%), showers late at night (0.25 in. of rain possible),
• Mostly cloudy with AM rain, showers likely (70%) Wednesday afternoon, then a good (50%) chance of showers Wednesday night.
• lows 45-49 cooling to 44 Wednesday night highs near 56.
• Mostly cloudy with a (40%) chance of showers Thursday and Thursday night,
• Mostly cloudy with a (30%) chance of showers and a bit warmer Friday, partly cloudy at night and Saturday (a bit warmer), mostly clear Saturday night,
• Then mostly cloudy and a bit warmer Sunday.
• highs 56-70 lows 42-44. (seasonal averages high 64 low 43)

 

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

• Mostly cloudy with rain tonight (0.75 in. of rain possible) and Monday AM, afternoon showers (0.75 in. of rain possible), cloudy with a (30%) chance of coastal showers at night while evening inland showers likely (70%) and a good (50%) chance of showers late at night (under 0.10 in. of rain possible),
• Mostly cloudy with rain Tuesday (0.50 in. of rain possible), showers at night (0.25 in. of rain possible),
• AM rain Wednesday, mostly cloudy with showers likely (60%) Wednesday, then a good (50%) chance of showers Wednesday night.
• lows 48-50 cooling to 46 Wednesday night highs near 55.
• Mostly cloudy with a (40%) chance of showers and a bit cooler Thursday and at night,
• Mostly cloudy with a (30%) chance of showers and a bit warmer Friday, just partly cloudy Friday night and Saturday, mostly clear at night and Saturday (a bit warmer),
• Then mostly cloudy and a bit cooler Sunday.
• highs 54-62 cooling to 58 Sunday lows near 44. (seasonal averages high 56 low 44)

 

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Forecast for the Cascades in Lane County:

• Mostly cloudy with rain and snow showers likely (70%) this evening, rain and snow likely (70%) late at night (0.50 in. of rain possible, 3-6 in. of snow possible),
• Mostly cloudy with AM rain and snow, rain and snow showers Monday afternoon (1.00 in. of rain possible, 5-11 in. of snow possible) and breezy (Wind: SW 10-15 mph increasing to SW 15-25 mph gusts to 40 mph in the afternoon), evening rain and snow showers, a good (50%) chance of rain and snow showers late Monday night (0.50 in. of rain possible, 1-3 in. of snow possible),
• Mostly cloudy with a good (50%) chance of AM rain and snow, rain and snow and a bit warmer Tuesday afternoon, rain and snow showers Tuesday night and Wednesday (a bit cooler), then rain and snow showers Wednesday night.
• snow level 4,500 ft. tonight and Monday, 4,500 ft. Monday night, 4,000 ft. Tuesday, 6,000 ft. Tuesday night then 4,000 ft. Wednesday and Wednesday night.
• lows 32-30 highs 40-42 cooling back to 40 Wednesday.
• Mostly cloudy with rain and snow likely (70%) and a bit warmer Thursday through Friday, a slight (20%) chance of rain and snow showers Friday night,
• Partly cloudy and a bit warmer Saturday and at night,
• Then a mix of clouds and sun and a bit warmer Sunday.
• snow level 3,500 ft. Thursday and Thursday night, 3,000 ft. Friday, 4,000 ft. Friday night, free air freezing level 5,500 ft. Saturday, 7,500 ft. Saturday night, then 8,000 ft. Sunday.
• highs 39-49 lows 28-24.

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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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