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 52 in the Moderate category measuring Particulate Matter.

Oakridge: The Air Quality Index is 45 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 49 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 UNTIL 10 AM MONDAY BELOW 1,000 FT. FOR THE THE NORTH OREGON CASCADES FOOTHILLS, AND THE CASCADE FOOTHILLS IN LANE COUNTY.
• A WINTER WEATHER ADVISORY IS IN EFFECT UNTIL 10 AM MONDAY BELOW 1,000 FT. FOR THE COAST RANGE OF NORTHWEST OREGON, THE CENTRAL COAST RANGE OF WESTERN OREGON, THE LOWER COLUMBIA, THE GREATER PORTLAND METRO AREA, THE CENTRAL WILLAMETTE VALLEY,  THE SOUTH WILLAMETTE VALLEY, THE WESTERN COLUMBIA GORGE, AND THE CENTRAL COLUMBIA GORGE.

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

• Cloudy with occasional rain or sleet mixed with snow at times this afternoon (0.10 in. of rain possible, locally 1 in. of snow possible), rain and freezing rain, or light sleet likely (60%) this evening, rain and freezing rain likely (70%) late tonight (0.10 in. of rain possible, 0.10 in. if ice accumulation possible),
• 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 through Tuesday night,
• highs 35-47 lows 32-36.
• A mix of clouds and sun with a slight (20%) chance of rain Wednesday, a (40%) chance of rainWednesday night,
• Mostly cloudy with a  slight (20%) chance of rain Thursday and Thursday  night,
• Just mostly cloudy Friday, partly cloudy at night.
• Then mostly cloudy 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:

• Cloudy with a good (50%) chance of rain this afternoon, a (30%) chance of rain tonight,
• Mostly cloudy and warmer with a (30%) chance of rain Monday, cloudy with a (30%) chance of rain in the evening, rain likely (70%) Monday night,
• Cloudy with a good (50%) chance of rain and a bit warmer Tuesday afternoon and evening, then cloudy with a (40%) chance of rain Tuesday night.
• highs 39-52 lows 35-39.
• 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:

• Cloudy with a good (50%) chance of afternoon inland rain while coastal rain likely (70%), a (30%) chance of rain tonight,
• Mostly cloudy and a bit warmer with a (30%) 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.
• highs 48-53 lows 42-44 cooling back to near 42 Tuesday night.
• Mostly cloudy with a (40%) 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 near 52 lows 40-42. (seasonal averages high 51 low 40).

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Forecast for the Cascades in Lane County:

• Cloudy and a bit warmer with rain or snow likely (70%) and a slight (20%) chance of sleet or freezing rain this afternoon (0.10 in. of rain possible, 0.10 in. of ice possible, 2 in. of snow possible)and tonight (under 0.10 in. of rain possible, under 0.10 in. pf ice possible, 1 in. of snow possible),
• Mostly cloudy with a slight (20%) chance of AM rain, freezing rain and snow Monday, a slight (20%) chance of rain and snow and a bit warmer in the afternoon, cloudy with 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 good (50%) chance of rain and snow Tuesday night.
• snow level at the surface today, 3,500 ft. tonight, 3,000 ft. Monday, then 4,500 ft. Monday night through Tuesday night.
• highs 32-34 lows 23-28.
• A mix of clouds and sun with a slight (20%) chance of rain and snow Wednesday, mostly cloudy with 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 mostly cloudy 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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