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 takes over returning valley rain and mountain snow. The days 1-3 graphic shows a frontal system moving through the Pacific Northwest ushering in some much colder air. The graphic for days 3-7 shows another frontal system that will push into Oregon Friday of 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 60 in the Moderate category measuring Particulate Matter.

Oakridge: The Air Quality Index is 81 in the Moderate category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 53 in the Moderate 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 TODAY UNTIL MIDNIGHT SUNDAY NIGHT FOR THE NORTHERN OREGON CASCADE FOOTHILLS,  THE NORTHERN OREGON CASCADES, AND TGHE 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, 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 ADVIISORY 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:

• A mix of clouds and sun with patchy freezing fog this AM, mostly sunny and cooler this afternoon, becoming mostly cloudy with a (40%) chance of evening rain, rain likely (70%) late Saturday night (0.10 in. of rain possible),
• Cloudy with AM rain (0.25 in. of rain possible) and snow showers likely (70%) Sunday (New Year’s Day), a good (50%) chance of snow showers and a bit cooler in the afternoon, a good (50%) chance of snow showers and colder Sunday night (under 0.10 in. of rain possible),
• Mostly cloudy and a bit cooler with a slight (20%) chance of snow showers Monday, then just partly cloudy at night.
• highs 38-29 lows 35-17.
• Mostly sunny and a bit cooler Tuesday, clear and cold at night,
• Sunny and warmer Wednesday, clear at night,
• Mostly sunny and a bit warmer Thursday, partly cloudy Thursday night,
• Then mostly cloudy and a bit warmer with a (30%) chance of snow showers Friday.
• highs 27-37 lows 13-22. (seasonal averages high 45 low 34)

 

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Forecast for Roseburg:

• Mostly sunny with patchy freezing fog this AM, sunny and a bit cooler this afternoon, becoming mostly cloudy with a (30%) chance of rain and snow showers this evening, rain and snow showers late 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 with rain and snow showers ( 0.25 in. of rain possible, snow level 1,500 ft. falling to 700 ft. in the afternoon) and a bit cooler Sunday (New Year’s Day), evening rain and snow showers, snow showers and colder late Sunday night (under 0.10 in. of rain possible, snow level 200 ft.),
• Cloudy with a good (50%) chance of snow showers and a bit cooler Monday, then mostly cloudy with a slight (20%) chance of snow showers at night.
• highs 42-32 lows 32-22.
• Partly cloudy and a bit cooler Tuesday, mostly clear at night,
• Mostly sunny and a bit warmer Wednesday, mostly clear Wednesday night,
• Mostly sunny and a bit warmer Thursday, partly cloudy at night,
• Then mostly cloudy with a slight (20%) chance of snow showers and a bit warmer Friday.
• highs 29-39 lows 13-9 warming to 19 Thursday night. (seasonal averages high 48 low 36)

 

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

• Sunny at the shore this AM and partly cloudy and a bit cooler with a slight (20%) chance of coastal showers this afternoon while sunny inland this AM and partly cloudy inland this afternoon, mostly cloudy a (40%) chance of evening showers, showers late tonight (0.10 in. of rain possible, snow level 1,500 ft. rising to 2,000 ft. late at night),
• Mostly cloudy and a bit cooler with coastal showers while rain and snow showers (0.25 in. of rain possible, snow level 1,500 ft. falling to 800 ft.) inland Sunday (New Year’s Day), coastal rain and snow showers Sunday night while evening inland rain and snow showers and inland rain and snow showers likely (70%) and colder Sunday night (0.10 in. of rain possible, snow level 500 ft. falling to 0 ft.),
• Cloudy with a (30%) chance of AM snow showers, a (40%) chance of snow showers and a bit cooler Monday afternoon, then mostly cloudy and colder with a slight (20%) chance of snow showers Monday night.
• highs 48-39 lows 35-23.
• Mostly sunny and a bit cooler Tuesday, mostly clear Tuesday night,
• Mostly sunny and a bit warmer Wednesday, mostly clear at night,
• Partly cloudy in the AM, sunny and a bit warmer Thursday afternoon, partly cloudy at night,
• Then mostly cloudy with a (40%) chance of rain and snow showers and a bit warmer Friday.
• highs 37-45  lows 22-32. (seasonal averages high 51 low 40)

 

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Forecast for the Cascades in Lane County:

• Sunny and a bit cooler today, becoming mostly cloudy with good (50%) chance of evening snow, snow and cold late tonight (3-6 in. of snow possible),
• Snow showers and a bit cooler Sunday (New Year’s Day), snow showers likely (70%) and cold at night,
• Cloudy and cooler with a (40%) chance of snow showers Monday, then mostly cloudy with a slight (20%) chance of snow showers at night.
• free air freezing level at the surface tonight, at the surface rising to 3,500 ft. Saturday afternoon, snow level at the surface Saturday night though Monday night.
• highs 32-15 lows 23-3.
• A mix of clouds and sun and a bit cooler Tuesday, mostly clear Tuesday night,
• Mostly sunny and a bit warmer Wednesday and Thursday, clear Wednesday night, partly cloudy Thursday night,
• Then mostly cloudy and a bit warmer with a slight (20%) chance of snow showers Friday.
• free air freezing level at the surface Tuesday through Thursday night, then snow level at the surface Friday.
• highs 13-28 lows 0-9.

 

 

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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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