Here is my weekly weather quiz question for the last time. What is “Active Storage Capacity?” Here is the correct answer. Active Storage Capacity: In hydrologic terms, the total amount of reservoir capacity normally available for release from a reservoir below the maximum storage level. It is total or reservoir capacity minus inactive storage capacity. More specifically, it is the volume of water between the outlet works and the spillway crest. I’ll have a new weekly weather quiz question for you starting Monday. Please remember to post your answer at the bottom of this page. An email will not suffice. The first person to post the correct answer will win a week of free personalized weather forecasts tailored to your needs.  Good luck.

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An elongated Upper Level Low Pressure Trough has moved in, but the high pressure behind it (Shaded “Arch” shape with blue arrows) will send cold air down to us from Canada. The days 1-3 graphic shows a frontal system moving through the Pacific Northwest ushering in much colder air. There will be some precipitation, but so far there shouldn’t be enough moisture to bring any more than just a light dusting of snow, if that much. The graphic for days 3-7 shows another frontal system that will slide Southward along the Oregon coast Friday into Saturday next week.  For mountain snow conditions at the local ski areas check out their websites or give them a call.

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Air Quality Index:

Eugene-Springfield: The Air Quality Index is 56 in the Moderate category measuring Particulate Matter.

Oakridge: The Air Quality Index is 23 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 25 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 7 PM THIS EVENING UNTIL MIDNIGHT SUNDAY NIGHT FOR THE COAST RANGE OF NORTHWEST OREGON, THE CENTRAL COAST RANGE OF WESTERN OREGON.
• A WINTER WEATHER ADVISORY IS IN EFFECT FROM 10 PM THIS EVENING UNTIL 10 PM SUNDAY FOR THE LOWER COLUMBIA, THE GREATER PORTLAND METRO AREA.
• A WINTER WEATHER ADVISORY IS IN EFFECT FROM MIDNIGHT TONIGHT UNTIL 6 AM MONDAY FOR THE CENTRAL WILLAMETTE VALLEY AND THE SOUTH WILLAMETTE VALLEY.
• A WINTER WEATHER ADVISORY IS IN EFFECT FROM 7 PM THIS EVENING UNTIL MIDNIGHT SUNDAY NIGHT FOR THE WESTERN COLUMBIA RIVER GORGE, THE CENTRAL COLUMBIA RIVER GORGE, THE NORTHERN OREGON CASCADES FOOTHILLS.
• A WINTER WEATHER ADVISORY IS IN EFFECT FROM 7 PM THIS EVENING UNTIL MIDNIGHT SUNDAY NIGHT FOR THE NORTHERN OREGON CASCADE FOOTHILLS,  THE NORTHERN OREGON CASCADES, AND THE UPPER HOOD RIVER VALLEY.
• A WINTER WEATHER ADVISORY IS IN EFFECT FROM 10 PM TONIGHT UNTIL 6 AM MONDAY FOR THE CASCADE FOOTHILLS IN LANE COUNTY AND THE CASCADES IN LANE COUNTY.
• A WINTER WEATHER ADVISORY IS IN EFFECT FROM 10 AM SUNDAY UNTIL 10 AM MONDAY ABOVE 500 FT. FOR THE SOUTH CENTRAL OREGON COAST, THE CURRY COUNTY COAST, CENTRAL DOUGLAS COUNTY.
• A WINTER STORM WARNING IS IN EFFECT FROM 10 PM TONIGHT THROUGH 10 AM MONDAY ABOVE 2,000 FT. FOR CENTRAL DOUGLAS COUNTY, EASTERN CURRY COUNTY,  JOSEPHINE COUNTY, AND JACKSON COUNTY.
• A WINTER STORM WARNING IS IN EFFECT FROM 10 PM TONIGHT THROUGH 10 AM MONDAY FOR CENTRAL DOUGLAS COUNTY,  AND THE EASTERN DOUGLAS COUNTY FOOTHILLS.
• A WINTER STORM WARNING IS IN EFFECT FROM 4 AM SUNDAY UNTIL 10 AM MONDAY ABOVE 2,000 FT. FOR EASTERN CURRY COUNTY, JOSEPHINE COUNTY.
• A WINTER WEATHER ADVISORY IS IN EFFECT FROM 4 AM SUNDAY UNTIL 10 AM MONDAY BELOW 2,000 FT. FOR JACKSON COUNTY.
• A WINTER WEATHER ADVISORY IS IN EFFECT FROM 10 PM TONIGHT UNTIL 10 AM MONDAY ABOVE 500 FT. FOR CENTRAL DOUGLAS COUNTY.
• A WINTER WEATHER ADVISORY IS IN EFFECT FROM 10 PM TONIGHT UNTIL 10 AM MONDAY FOR THE SOUTH CENTRAL OREGON CASCADES, THE SOUTHERN OREGON CASCADES , AND THE SISKIYOU MOUNTAINS, NORTHERN AND EASTERN KLAMATH COUNTY, AND WESTERN LAKE COUNTY.
• 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 rain and snow beginning this evening, rain and snow showers late tonight (0.10 in. of rain possible, 1 in. of snow possible, snow level 1,000 ft.),
• Cloudy and a bit warmer with rain and snow showers (0.25 in. of rain possible, 1 in. of snow possible) Sunday (New Year’s Day), evening snow showers, a good (50%) chance of snow showers and colder late Sunday night (under 0.10 in. of rain possible, 1 in. of snow possible),
• Mostly cloudy and a bit cooler with a slight (20%) chance of snow showers Monday, just partly cloudy and cold at night,
• Mostly sunny and a bit cooler Tuesday, mostly clear and cold with a slight (20%) chance of snow showers at night.
• lows 32-13 highs 38-29.
• A mix of clouds and sun and a bit warmer with a slight (20%) chance of snow Wednesday, mostly cloudy with a slight (20%) chance of snow showers Wednesday night,
• Partly cloudy and a bit warmer Thursday and at night,
• Mostly cloudy and a bit warmer Friday, a (40%) chance of rain and snow Friday night,
• Then mostly cloudy with a good (50%) chance of rain Saturday.
• highs 32-38 lows 18-26. (seasonal averages high 45 low 34)

 

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Forecast for Roseburg:

• Mostly cloudy with a (30%) chance of rain and snow this evening, rain and snow tonight (0.10 in. of rain possible, 1-2 in. of snow possible above 1,500 ft. and 1 in. of snow possible lower elevations, snow level 900 ft.),
• Mostly cloudy and a bit cooler Sunday (New Year’s Day) with rain and snow showers ( 0.25 in. of rain possible, 2-4 in. of snow possible above 1,500 ft. while 1-2 in. of snow possible at lower elevations, snow level 1,000 ft.),  evening rain and snow showers, a good (50%) chance of snow showers and colder late Sunday night (0.10 in. of rain possible, 3-4 in. of snow possible above 1,500 ft. and 1-2 in. of snow possible at lower elevations, snow level 300 ft.),
• Cloudy with a good (50%) chance of snow showers and a bit cooler Monday (under 0.10 in. of rain possible), mostly cloudy with a (40%) chance of snow showers at night,
• Mostly cloudy with a (40%) chance of AM snow showers, partly cloudy and a bit cooler with a (30%) chance of showers Tuesday afternoon, a (30%) chance of evening snow showers, then a (30%) chance of snow showers and a slight (20%) chance of freezing rain late Tuesday night.
• lows 32-20 highs 38-33.
• Mostly cloudy with a (30%) chance of rain, snow and a slight (20%) chance of freezing rain Wednesday AM, a (30%) chance of rain and snow and a bit warmer in the afternoon,  mostly cloudy with a (30%) chance of rain and snow showers Wednesday night,
• Mostly cloudy with a slight (20%) chance of rain and snow showers and a bit warmer Thursday through Friday, a (30%) chance of rain and snow showers Friday night,
• Then mostly cloudy with rain and snow likely (70%) and a bit warmer Saturday.
• highs 35-43 lows 23-32t. (seasonal averages high 48 low 36)

 

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

• Mostly cloudy with coastal rain likely (70%) this evening while a good (50%) chance of inland rain early this evening and inland rain late this evening and tonight (0.10 in. of rain possible, snow level 2,000 ft. late tonight),
• Mostly cloudy and a bit cooler with AM coastal showers and showers with a slight (20%) chance of thunderstorms Sunday afternoon (New Year’s Day) while rain and snow showers inland (0.25 in. of rain possible, 1-2 in. of snow possible, snow level 1,500 ft. falling to 1,000 ft. in the afternoon), evening coastal showers and coastal rain and snow showers late at night while evening inland evening showers and inland rain and snow showers likely (70%) late Sunday night (0.25 in. of rain possible, 1-2 in. of snow possible, snow level 600 ft.),
• Cloudy with a good (50%) chance of rain and snow showers Monday AM (snow level 200 ft.), mostly cloudy with a (40%) chance of rain and snow showers and a bit cooler Monday afternoon (0.10 in. of rain possible, snow level 100 ft.), mostly cloudy and colder with a good (50%) chance of snow showers Monday night (snow level 100 ft.),
• Mostly cloudy with a (40%) chance of AM rain and snow showers, partly cloudy and a bit warmer Tuesday with a (30%) chance of afternoon rain and snow showers, partly cloudy with a (30%) chance of rain and snow showers and a slight (20%) chance of freezing rain late Tuesday night.
• lows 36-26 highs 42-39 warming back to 42 Tuesday.
• Mostly cloudy with a (30%) chance of AM rain and snow, a bit warmer with a (40%) chance of rain Wednesday afternoon, a (30%) chance of showers at night,
• Mostly cloudy and a bit warmer with a slight (20%) chance of showers Thursday through Friday, a (40%) chance of showers Friday night,
• Then mostly cloudy with rain likely (70%) and a bit warmer Saturday.
• highs 44-48  lows 27-37. (seasonal averages high 51 low 40)

 

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Forecast for the Cascades in Lane County:

• Mostly cloudy with evening snow becoming likely (70%), snow showers and cold late tonight (3-4 in. of snow possible),
• Snow showers (4-6 in. of snow possible) and a bit cooler Sunday (New Year’s Day), snow showers and cold at night (1-3 in. of snow possible),
• Cloudy and cooler with a good (50%) chance of snow showers Monday, mostly cloudy and very cold with a slight (20%) chance of snow showers at night,
• A mix of clouds and sun and a bit cooler Tuesday, then partly cloudy with a slight (20%) chance of snow showers Tuesday night.
• snow level at the surface tonight though Monday night, free air freezing level at the surface Tuesday, then snow level at the surface Tuesday night.
• lows 19-0 highs 26-19.
• A mix of clouds and sun and a bit warmer with a good (50%) chance of snow Wednesday, a (40%) chance of snow showers Wednesday night,
• A mix of clouds and sun with a slight (20%) chance of snow showers Thursday, partly cloudy with a slight (20%) chance of snow showers late at night,
• Mostly cloudy and a bit warmer Friday, a (40%) chance of snow Friday night,
• Then mostly cloudy with a good (50%) chance of snow Saturday.
• snow level at the surface Wednesday through Thursday night, free air freezing level at the surface Friday, then snow level at the surface Friday night and Saturday.
• highs 19-28 lows 0-13.

 

 

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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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