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) has taken over clearing the skies for some drying time, but also colder temperatures. 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 117 in the Unhealthy for Sensitive Groups category measuring Particulate Matter.

Oakridge: The Air Quality Index is 78 in the Moderate category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 100 in the Moderate category measuring Particulate Matter.

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

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Advisories:

• A WIND ADVISORY IS IN EFFECT UNTIL 10 PM TONIGHT FOR THE GREATER PORTLAND METRO AREA.
• A FREEZE WARNING IS IN EFECT UNTIL 8 AM TODAY FOR THE SOUTH CENTRAL OREGON COAST AND THE CURRY COUNTY COAST.
• AN AIR STAGNATION ADVISORY IS IN EFFECT UNTIL 10 AM TODAY FOR CENTRAL DOUGLAS COUNTY, EASTERN CURRY COUNTY, AND JOSEPHINE COUNTY.

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

• Sunny today, clear this evening, partly cloudy tonight,
• Cloudy with a slight (20%) chance of AM freezing rain, sleet or snow Sunday, a (40%) chance of rain and a bit warmer in the afternoon, a (40%) chance of rain and a slight (20%) chance of freezing rain Sunday night,
• Mostly cloudy and a bit warmer with a (40%) chance of rain and a slight (20%) chance of freezing rain or sleet Monday AM, a (40%) chance of afternoon rain, then cloudy with a good (50%) chance of rain Monday night.
• highs 40-45 lows 26-36.
• Mostly cloudy with a good (50%) chance of rain Tuesday, rain likely (70%) at night,
• Cloudy with a (30%) chance of rain Wednesday, mostly cloudy with a slight (20%) chance of rain Wednesday night through Thursday night,
• Then just mostly cloudy Friday.
• highs near 45 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:

• Areas of AM fog and freezing fog today, sunny with patchy lingering fog this afternoon, partly cloudy in the evening, mostly cloudy with a (30%) chance of rain and snow and a slight (20%) chance of light freezing rain late tonight (snow level 1,500 ft. late at night),
• Cloudy with a (40%) chance of rain and snow Sunday AM, a bit warmer with 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,
• Cloudy with a (40%) chance of rain and warmer Monday and Monday night
• highs 40-50 lows 32-42.
• Cloudy with a good (50%) chance of AM rain, rain likely (60%) and a bit warmer Tuesday afternoon and evening, then a (40%) chance of rain late Tuesday night through Friday (cooler Friday).
• highs 52-45 lows 42-37. (seasonal averages high 48 low 36)

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

• Areas of inland patchy fog and freezing fog this AM, sunny this afternoon, partly cloudy this evening, mostly cloudy with a (40%) chance of coastal rain tonight, while mostly cloudy with a (40%) chance of inland rain late tonight,
• Cloudy with AM rain likely (60%) Sunday, a good (50%) chance of afternoon rain, cloudy with a (40%) chance of rain Sunday night,
• Cloudy and a bit warmer with a good (50%) chance of rain Monday and in the evening, then rain likely (70%) late Monday night.
• highs 50-54 lows 39-47.
• Mostly cloudy with rain Tuesday and Tuesday night,
• Then mostly cloudy with a (40%) chance of  Wednesday through Friday.
• highs 54-50 lows 44-40 warming to 43 Thursday night. (seasonal averages high 51 low 40).

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Forecast for the Cascades in Lane County:

• Sunny today, partly cloudy this evening, mostly cloudy and cold with a slight (20%) chance of snow late tonight (Wind: SE 15-25 mph gusts to 35 mph),
• Cloudy and a bit warmer with a slight (20%) chance of snow or freezing rain Sunday AM, a (40%) chance of rain and snow in the afternoon, a (40%) chance of rain and snow with a slight (20%) chance of freezing rain Sunday night,
• Mostly cloudy with a good (50%) chance of rain and snow with a slight (20%) chance of freezing rain Monday AM, a good (50%) chance of rain and snow in the afternoon, then cloudy with a good (50%) chance of rain and snow Monday night.
• free air freezing level at the surface today and tonight, 3,500 ft. Sunday, 4,000 ft. Sunday night, 4,500 ft. Monday, then 5,500 ft. Monday night.
• highs 26-34 lows 15-29.
• Cloudy with a good (50%) chance of rain and snow Tuesday and Tuesday night,
• Mostly cloudy with a (40%) chance of rain and snow Wednesday, a slight (20%) chance of rain and snow Wednesday night through Thursday night,
• Then mostly cloudy and a bit cooler with a (30%) chance of rain and snow Friday.
• snow level 4,500 ft. Tuesday through Wednesday, then 4,000 ft. Wednesday night through Friday.
• highs 34-30 lows 28-24.

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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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