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 rain and freezing rain likely (70%) this evening, a (40%) chance of rain and freezing late tonight (0.10 in. of rain possible, under 0.10 in. if ice accumulation possible),
• Cloudy with a good (50%) chance of rain, freezing rain and light freezing drizzle Monday AM, a slight (20%) chance of afternoon rain, rain likely (70%) Monday night (0.10 in. of rain possible) and Tuesday AM, a bit warmer with a (40%) chance of rain in the afternoon, mostly cloudy with a good (50%) chance of rain at night (0.10 in. of rain possible),
• A mix of clouds and sun with a slight (20%) chance of rain Wednesday, then mostly cloudy with a (30%) chance of rainWednesday night.
• lows 30-35 cooling to 33 Tuesday night warming to 36 Wednesday night highs 40-47.
• Mostly cloudy with a slight (20%) chance of rain Thursday through Friday night,
• Then mostly cloudy with a (30%) chance of rain Saturday and Sunday, just a slight (20%) chance of rain Saturday night.
• highs 44-46 cooling to 43 Saturday and Sunday lows near 33. (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 cloudy with a (30%) chance of rain tonight (under 0.10 in. of rain possible),
• Cloudy and warmer with a slight (20%) chance of rain Monday (under 0.10 in. of rain possible), a (30%) chance of rain in the evening, rain likely (70%) Monday night (0.15 in. of rain possible),
• Cloudy with a (40%) chance of rain and a bit warmer Tuesday afternoon (under 0.10 in. of rain possible) and evening, mostly cloudy with a (30%) chance of rain Tuesday night (under 0.10 in. of rain possible),
• Mostly cloudy a bit cooler with a slight (20%) chance of rain Wednesday, then cloudy with a (30%) chance of Wednesday night.
• lows 37-40 cooling back to 37 Wednesday night highs 44-50 cooling to 47 Wednesday.
• Cloudy with a (30%) chance of rain Thursday, mostly cloudy with a slight (20%) chance of rain Thursday night,
• Mostly cloudy Friday, partly cloudy at night,
• Mostly cloudy with a slight (20%) chance of rain Saturday and Saturday night,
• Then mostly cloudy with a (30%) chance of rain Sunday.
• highs 46-48 lows 37-40. (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 (30%) chance of rain tonight (under 0.10 in. of rain possible) and Monday (under 0.10 in. of rain possible), rain likely (70%) Monday night (0.25 in. of rain possible),
• Cloudy with a (40%) of AM coastal rain and rain likely (70%) Tuesday afternoon while a (40%) chance of rain inland Tuesday (0.15 in. of rain possible), evening coastal rain likely (70%) with a good (50%) chance of rain Tuesday night,
• Mostly cloudy with a (40%) chance of  rain Wednesday and Wednesday night.
• lows 40-43 cooling back to near 42 Wednesday night highs 53-55 cooling back to 53 Wednesday.
• Cloudy with a (30%) chance of rain Thursday, a slight (20%) chance of rain at night,
• Just mostly cloudy Friday, partly cloudy Friday night,
• Mostly cloudy with a (40%) chance of rain Saturday, a slight (20%) chance of rain Saturday night,
• Then mostly cloudy with a (30%) chance of rain Sunday.
• highs 50-53 lows 40-44. (seasonal averages high 51 low 40).

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Forecast for the Cascades in Lane County:

• Cloudy rain and snow likely (70%) and a slight (20%) chance of freezing rain in the valleys tonight (under 0.10 in. of rain possible, 1 in. of snow possible),
• Mostly cloudy with a slight (20%) chance of AM rain, freezing rain, light freezing drizzle and snow Monday AM, a slight (20%) chance of rain and snow and a bit warmer in the afternoon, cloudy with a good (50%) chance of evening rain and snow, rain and snow likely (70%) and a slight (20%) chance of freezing rain late Monday night (0.10 in. of rain possible, 2 in. of snow possible),
• Cloudy with rain, snow likely (70%) and a slight (20%) chance of freezing rain Tuesday AM, a good (50%) chance of rain, rain and snow in the evening, a good (50%) chance of rain, snow and a slight (20%) chance of freezing rain Tuesday night,
• A mix of clouds and sun with a slight (20%) chance of rain, freezing rain and snow Wednesday AM, mostly cloudy with a slight (20%) chance of rain an d snow in the afternoon, then mostly cloudy with a (30%) chance of rain and snow at night.
• snow level 3,500 ft. tonight, 3,000 ft. Monday, then 4,500 ft. Monday night, 5,000 ft. Tuesday, 4,000 ft. Tuesday night, 3,500 ft. Wednesday, then 4,000 ft. Wednesday night.
• lows 23-28 cooling to 24 Wednesday night highs near 34.
• Mostly cloudy with a (30%) chance of  rain and snow and a bit cooler Thursday, a slight (20%) chance of rain and snow Thursday night through Friday night,
• A (30%) chance of rain and snow Saturday and Sunday, mostly cloudy with a (40%) chance of rain and snow Saturday night.
• snow level 3,500 ft. Thursday, 3,000 ft. Thursday night and Friday, 3,500 ft. Friday night and Saturday, 4,000 ft. Saturday night, then 3,500 ft. Sunday.
• highs 32-29 warming back to 32 Sunday lows 20-23.

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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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