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 through, but the high pressure behind it (Shaded “Arch” shape with blue arrows) is sending cold air down to us from Canada. The days 1-3 graphic shows a surface low and frontal system that moved Southward through the Pacific Northwest ushering in 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 for the South Willamette Valley, if that much. The graphic for days 3-7 shows another frontal system that will be headed our way 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 19 in the Good category measuring Particulate Matter.

Oakridge: The Air Quality Index is 38 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 11 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 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  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 THROUGH 10 AM MONDAY FOR CENTRAL DOUGLAS COUNTY,  AND THE EASTERN DOUGLAS COUNTY FOOTHILLS.
• A WINTER STORM WARNING IS IN EFFECT UNTIL 10 AM MONDAY ABOVE 2,000 FT. FOR EASTERN CURRY COUNTY, JOSEPHINE COUNTY.
• A WINTER WEATHER ADVISORY IS IN EFFECT UNTIL 10 AM MONDAY BELOW 2,000 FT. FOR JACKSON COUNTY.
• A WINTER WEATHER ADVISORY IS IN EFFECT UNTIL 10 AM MONDAY ABOVE 500 FT. FOR CENTRAL DOUGLAS COUNTY.
• A WINTER WEATHER ADVISORY IS IN EFFECT UNTIL 10 AM MONDAY FOR EASTERN CURRY COUNTY, JOSEPHINE COUNTY, THE SOUTH CENTRAL OREGON CASCADES, THE SOUTHERN OREGON CASCADES , THE SISKIYOU MOUNTAINS, NORTHERN AND EASTERN KLAMATH COUNTY, AND WESTERN LAKE COUNTY.
• *A HIGH SURF ADVISORY IS IN EFFECT UNTIL 4 AM MONDAY FOR SOUTH CENTRAL OREGON COAST AND THE CURRY COUNTY COAST.
• 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 evening rain and snow showers likely (70%), a good (50%) chance of snow showers and colder late tonight (under 0.10 in. of rain possible, under 1 in. of snow possible),
• A mix of clouds and sun and a bit cooler with a slight (20%) chance of snow showers Monday (under 0.10 in. of rain possible), partly cloudy and cold with a slight (20%) chance of snow showers at night,
• Just partly cloudy and a bit warmer Tuesday, a slight (20%) chance of snow showers and cold Tuesday night,
• Mostly cloudy and a bit cooler with a good (50%) chance of snow Wednesday, then a slight (20%) chance of snow showers Wednesday night.
• lows 29-19 highs 34-32.
• A mix of clouds and sun and a bit cooler with a slight (20%) chance of snow showers Thursday and Friday (a bit warmer), mostly cloudy with a slight (20%) chance of snow showers Thursday night, a slight (20%) chance of rain and snows Friday night,
• Mostly cloudy with a good (50%) chance of rain and snow and a bit cooler Saturday, then cloudy with a good (50%) chance of rain and a bit warmer Saturday night and Sunday.
• highs 30-38 cooling to 35 Saturday warming to 42 Sunday lows 25-34. (seasonal averages high 46 low 34)

 

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Forecast for Roseburg:

• Mostly cloudy with evening rain and snow showers, a good (50%) chance of snow showers and colder late Sunday night (0.10 in. of rain possible, 3-5 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 rain and snow showers and a bit cooler Monday (under 0.10 in. of rain possible, 1 in. of snow possible, snow level 300 ft.), mostly cloudy with a (30%) chance of rain and snow showers at night (under 0.10 in. of rain possible, snow level 500 ft.),
• Mostly cloudy with a (30%) chance of rain and snow showers and a bit warmer Tuesday (under 0.10 in. of rain possible, snow level 200 ft.), a (30%) chance of evening rain and snow showers, a (30%) chance of rain and snow showers and a slight (20%) chance of freezing rain late Tuesday night (under 0.10 in. of rain possible),
• Mostly cloudy with rain, snow likely (70%) and a slight (20%) chance of freezing rain Wednesday AM, rain and snow likely (70%) and a bit warmer in the afternoon, mostly cloudy with a (30%) chance of rain and snow showers Wednesday night.
• lows 29-26 warming to 32 Tuesday night cooling to 29 Wednesday night highs 37-42.
• Mostly cloudy with a (40%) chance of rain and snow showers and a bit cooler Thursday and Thursday night,
• A slight  (20%) chance of rain and snow showers and a bit warmer Friday, a (30%) chance of rain and snow at night,
• Mostly cloudy with rain and snow likely (70%) and a bit warmer Saturday and Saturday night,
• Then rain likely (70%) and a slight bit warmer Sunday.
• highs 38-45 lows 33-38. (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 showers and a slight (20%) chance of isolated thunderstorms this evening with  coastal showers, snow showers and isolated thunderstorms late tonight while inland evening rain and snow showers tonight (0.25 in. of rain possible, 2-3 in. of snow possible inland, snow level 700 ft.),
• Cloudy with coastal showers likely (70%) Monday AM while AM inland rain and snow showers likely (70%) and a good (50%) chance of rain and snow showers and a bit cooler in the afternoon (under 0.10 in. of rain possible, 1 in. of snow possible, snow level 600 ft.), mostly cloudy with a (40%) chance of evening coastal showers and a good (50%) chance of rain and snow showers late at night while a (40%) chance of inland rain and snow showers and a bit cooler Monday night (0.10 in. of rain possible, snow level 800 ft. falling to 300 ft. late at night),
• Mostly cloudy with a (30%) chance of AM coastal rain and snow showers while mostly cloudy and a bit warmer Tuesday afternoon with a (30%) chance of inland rain and snow showers, a (30%) chance of evening coastal showers and a (30%) chance of showers and a slight (20%) chance of freezing rain late at night and snow showers and a slight (20%) chance of coastal freezing rain late Tuesday night while a (30%) chance of showers, snow showers and a slight (20%) chance of freezing rain inland Tuesday night (0.10 in. of rain possible, snow level 1,000 ft.),
• Mostly cloudy with AM rain and snow likely (70%), rain likely (70%) Wednesday afternoon, then mostly cloudy with a (30%) chance of showers at night.
• lows near 33 highs 42-45.
• Mostly cloudy with a slight (20%) chance of showers Thursday through Friday, a (40%) chance of rain Friday night,
• Then mostly cloudy with rain likely (70%) and a bit warmer Saturday and Saturday night,
• Then mostly cloudy with rain Sunday.
• highs 45-50 lows 37-42. (seasonal averages high 51 low 40)

 

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Forecast for the Cascades in Lane County:

• Mostly cloudy with snow showers and cold tonight (1-2 in. of snow possible),
• Mostly cloudy and cooler with a good (50%) chance of snow showers Monday and Monday night,
• A slight (20%) chance of AM snow showers, a mix of clouds and sun and a bit cooler with a (40%) chance of snow showers Tuesday afternoon, mostly cloudy with a good (50%) chance of snow showers in the evening, snow showers likely (70%) and cold late Tuesday night,
• Mostly cloudy with AM snow likely (70%) Wednesday, a good (50%) chance of snow and a bit warmer in the afternoon, then mostly cloudy with a good (50%) chance of snow showers Wednesday night.
• snow level at the surface tonight through Wednesday.
• lows 14-18 cooling to 8 Wednesday night highs 22-25 cooling back to 22 Wednesday.
• Mostly cloudy with with a slight (20%) chance of snow showers Thursday and at night,
• A mix of clouds and sun and a bit warmer Friday, mostly cloudy with a (30%) chance of snow showers Friday night,
• Mostly cloudy with a good (50%) chance of snow Saturday and at night,
• Then snow likely (70%) with a good (50%) chance of rain Sunday.
• snow level at the surface Thursday night through Saturday night, then 4,500 ft. Sunday.
• highs 18-32 lows 13-22.

 

 

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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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