Here is my weekly weather quiz question for the last time. What is “Deep Percolation Loss?” Here is the correct answer. Deep Percolation Loss: In hydrologic terms, water that percolates downward through the soil beyond the reach of plant roots. I’ll have a new weekly weather quiz question for you starting Monday. Please remember to post your answer as a comment by clicking on “no comments /comments” in the upper right hand portion of this page under the caption, then add your comment. The first person to post the correct answer will win a week of free personalized weather forecasts tailored to your needs. The answer has to be a comment to win. An email answer will not count. Good luck.

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An upper level blocking high pressure ridge (Shaded “Arch” shape with blue arrows) cleared the skies for some drying time, but also colder temperatures. Now a couple of low pressure disturbances (Shown as small shaded areas) will move through from the south sliding moisture into our area. A frontal system will bring back the chance of precipitation back to Oregon. Again, more storms head our way as a frontal system approaches the coast Tuesday. By Saturday another frontal system approaches the Pacific Northwest. Local skiers continue to rejoice. The mountains have a lot of new snow and Willamette Pass, Hoodoo and Mt. Ashland are all open. Check their websites for updates.

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Air Quality Index:

Eugene-Springfield: The Air Quality Index is 37 in the Good category measuring Particulate Matter.

Oakridge: The Air Quality Index is 31 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 35 in the Good category measuring Particulate Matter.

Data courtesy of Lane Regional Air Protection Agency (LRAPA).

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Advisories:

• A WINTER WEATHER ADVISORY IS IN EFFECT FROM 4 AM UNTIL 4 PM SUNDAY FOR THE VALLEYS OF THE CENTRAL COAST RANGE , THE VALLEYS OF THE NORTH OREGON CASCADES FOOTHILLS, AND THE VALLEYS OF THE CASCADE FOOTHILLS IN LANE COUNTY.
• A WINTER WEATHER ADVISORY IS IN EFFECT FROM 4 AM UNTIL 4 PM SUNDAY BELOW 1,000 FT. FOR THE CENTRAL WILLAMETTE VALLEY, AND THE SOUTH WILLAMETTE VALLEY.
• A WINTER WEATHER ADVISORY IS IN EFFECT FROM 10 AM UNTIL 8 PM SUNDAY FOR THE CENTRAL COLUMBIA RIVER GORGE
• A WIND ADVISORY IS IN EFFECT UNTIL 10 PM TONIGHT FOR THE GREATER PORTLAND METRO AREA.
• A FREEZING RAIN ADVISORY IS IN EFECT FROM 1 AM UNTIL 10 AM SUNDAY FOR THE SOUTH CENTRAL OREGON COAST, CENTRAL DOUGLAS COUNTY, AND THE EASTERN DOUGLAS COUNTY FOOTHILLS.
• A FREEZING RAIN ADVISORY IS IN EFECT FROM 7 PM TONIGHT UNTIL 10 AM SUNDAY FOR EASTERN CURRY COUNTY, JOSEPHINE COUNTY, AND JACKSON COUNTY.

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Forecast for the Southern and lower Mid Willamette Valley including Eugene-Springfield and Albany-Corvallis:

• Partly cloudy this evening, mostly cloudy late tonight,
• Cloudy with a slight (20%) chance of AM light snow or sleet, freezing rain, sleet or snow Sunday afternoon (0.10 in. of rain possible, 0.10 in, of ice accumulation possible, locally 1 in. of snow possible), a good (50%) chance of rain and freezing rain Sunday night,
• Mostly cloudy with a slight (20%) chance of rain and freezing rain Monday AM, a slight (20%) chance of afternoon rain and a bit warmer, a good (50%) chance of rain Monday night,
• Cloudy with a good (50%) chance of rain Tuesday, then a slight (20%) chance of rain at night.
• lows 23-36 highs 34-45.
• Mostly cloudy with a good (50%) chance of rain Wednesday and Wednesday night,
• Mostly cloudy with a  slight (20%) chance of rain Thursday and Thursday  night,
• Just mostly cloudy Friday, partly cloudy at night.
• Then a mix of clouds and sun with a 30% chance of rain Saturday.
• highs 45-43 lows 36-32. (seasonal averages high 46 low 34)

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Home Wood Heating Advisory:

Eugene-Springfield: YELLOW– Caution is Advised.

Oakridge:  YELLOW– Caution is Advised.

*Note: Pellet stoves may be used anytime if they produce no visible emissions.

Advisory Courtesy of Lane Regional Air Protection Agency (LRAPA).

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Forecast for Roseburg:

• Mostly clear this evening, cloudy with a (40%) chance of rain and snow and a slight (20%) chance of light freezing rain late tonight (snow level 1,500 ft. late tonight),
• Cloudy with rain and snow likely (70%) with a slight (20%) chance of light freezing rain Sunday AM (snow level 1,500 ft.), a good (50%) chance of rain in the afternoon (snow level 2,000 ft. rising to 3,500 ft. in the afternoon), a (30%) chance of rain Sunday night,
• Mostly cloudy and warmer with a slight (20%) chance of rain Monday (afternoon snow level 3,500 ft.), cloudy with a (30%) chance of rain Monday night,
• Cloudy with a good (50%) chance of AM rain, rain likely (60%) and a bit warmer Tuesday afternoon and evening, then cloudy with a (40%) chance of rain Tuesday night.
• lows 32-39 highs 42-50.
• Mostly cloudy a bit cooler with a (30%) chance of rain Wednesday through Thursday night,
• Mostly cloudy with a slight (20%) chance of rain Friday and Saturday, partly cloudy with a slight (20%) chance of rain Friday night.
• highs 48-46 lows near 37. (seasonal averages high 48 low 36)

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Forecast for the South Oregon Coast including Coos Bay and North Bend:

• Increasing clouds this evening with a slight (20%) chance of inland rain and a good (50%) chance of rain and a slight (20%) chance of light freezing rain inland late tonight while a good (50%) chance of coastal rain late tonight,
• Cloudy with inland AM rain likely (60%) Sunday and a good (50%) chance of afternoon rain while coastal rain likely (70%), a (30%) chance of rain Sunday night,
• Mostly cloudy and a bit warmer with a slight (20%) chance of rain Monday,  a good (50%) chance of inland rain in the evening and rain likely (70%) late Monday night while coastal rain likely (70%) Monday night,
• Mostly cloudy with rain likely (70%) Tuesday, then cloudy with a good (50%) chance of rain Tuesday night.
• lows 36-44 cooling to near 40 Tuesday night highs 50-54 cooling to 52 Tuesday.
• Cloudy with a (40%) chance of  rain Wednesday, mostly cloudy with a (40%) chance of rain Wednesday night through Thursday night,
• Mostly cloudy with a slight (20%) chance of rain Friday and Saturday, partly cloudy with a slight (20%) chance of rain Friday night.
• highs near 52 lows 40-42. (seasonal averages high 51 low 40).

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Forecast for the Cascades in Lane County:

• Partly cloudy this evening, cloudy and cold with a slight (20%) chance of snow flurries late tonight,
• Cloudy and a bit warmer with a slight (20%) chance of rain and snow Sunday AM, rain or snow likely (70%) with a slight (20%) chance of sleet or freezing rain in the valleys in the afternoon (0.10 in. of rain possible, 0.10 in. of valley ice possible, 2 in. of snow possible), mostly cloudy with a (40%) chance of rain, freezing rain and snow  Sunday night,
• Cloudy with a slight (20%) chance of AM rain, freezing rain and snow Monday AM, a slight (20%) chance of rain and snow and a bit warmer in the afternoon, then cloudy with a (40%) chance of evening rain and snow, a good (50%) chance of rain, snow and a slight (20%) chance of freezing rain late Monday night,
• Cloudy with a good (50%) chance of rain, snow and a slight (20%) chance of freezing rain Tuesday, a (40%) chance of rain and snow Tuesday night.
• snow level at the surface tonight, 2,500 ft. rising to 5,000 ft. Sunday afternoon, 4,000 ft. Sunday night, 3,000 ft. Monday, then 4,500 ft. Monday night through Tuesday night.
• lows 10-29 highs 28-32.
• Mostly cloudy with a (40%) chance of rain and snow Wednesday, a good (50%) chance of rain and snow at night,
• A (30%) chance of  rain and snow Thursday, mostly cloudy with a slight (20%) chance of rain and snow Thursday night through Friday night,
• Then a mix of clouds and sun with a (30%) chance of rain and snow Saturday.
• snow level 4,500 ft. Wednesday, 4,000 ft. Wednesday night, 3,500 ft. Thursday, 3,000 ft. Thursday night, 3,500 ft. Friday, 4,000 ft. Friday night, then 4,500 ft Saturday.
• highs 33-30 lows 23-20 warming back to 23 Friday night.

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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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