Here is my weekly weather quiz question for the last time. What is  a “Percolation Path?” Here is the correct answer. A Percolation Path: In hydrologic terms, the course followed by water moving or percolating through any other permeable material, or under a dam which rests upon a permeable foundation. 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 low trough of low pressure (Shaded “U” shape with blue arrows) still controls our weather and moving slowly to the north. High pressure (Shaded “Arch” shape with blue arrows) will take over by Wednesday. By Saturday a cold front is poised over the Pacific Ocean to approach the coast and ,of course, that means a return to wet weather.

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Air Quality Index:

Eugene-Springfield: The Air Quality Index is 13 in the Good category measuring Particulate Matter.

Oakridge: The Air Quality Index is 5 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 12 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 6 AM TUESDAY FOR THE NORTHERN OREGON CASCADES AND THE CASCADES IN LANE COUNTY.
• A WINTER WEATHER ADVISORY IS IN EFFECT UNTIL 11 PM TONIGHT FOR THE EASTERN DOUGLAS COUNTY FOOTHILLS,  THE SOUTH CENTRAL OREGON CASCADES, THE SOUTHERN OREGON CASCADES AND THE SISKIYOU MOUNTAINS.

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

• Mostly cloudy with showers and a slight (20%) chance of evening thunderstorms and small hail possible, showers likely (70%) late tonight (0.25 in. of rain possible),
• Cloudy with showers Tuesday AM, a bit warmer with the chance of showers decreasing to (30%) in the afternoon (0.20 in. of rain possible), cloudy with a (30%) chance of evening showers, patchy fog late Tuesday night (under 0.10 in. of rain possible),
• Cloudy with patchy fog and a slight (20%) chance of showers Wednesday AM, a mix of clouds and sun and a bit warmer in the afternoon, partly cloudy in the evening,  just clear with patchy fog late Wednesday night and Thursday AM, sunny and a bit warmer in the afternoon, then clear Thursday night.
• lows 38-40 cooling to 34 Wednesday night, warming to 36 Thursday night highs 50-60.
• Mostly sunny and a bit warmer Friday, partly cloudy Friday night,
• Mostly cloudy and a bit cooler with a (30%) chance of rain Saturday and at night,
• Cloudy and a bit cooler with a good (50%) chance of rain Sunday, then cloudy with a good (50%) chance of showers Sunday night and Monday.
• highs 66-56 lows 43-46 cooling back to 43 Sunday night. (seasonal averages high 56 low 37).

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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.

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

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Forecast for Roseburg:

• Mostly cloudy with showers tonight (0.10 in. of rain possible, snow level 2,500 ft. rising to 3,000 ft. late tonight),
• AM showers, mostly cloudy with a good (50%) chance of rain and snow showers and a bit warmer Tuesday afternoon (under 0.10 in. of rain possible, snow level 3,500 ft.), a (30%) chance of showers at night (under 0.10 in. of rain possible) and patchy fog late,
• Mostly cloudy with patchy fog Wednesday AM, mostly cloudy with a slight (20%) chance of showers and a bit warmer Wednesday afternoon, partly cloudy in the evening, mostly clear with patchy fog late Wednesday night,
• Patchy mainly AM and late night fog and sunny and a bit warmer Thursday, mostly clear at night.
• lows near 40 highs 54-67.
• Patchy mainly AM and late night fog and sunny and a bit warmer Friday, becoming mostly cloudy with a slight (20%) chance of rain Friday night,
• Mostly cloudy and a bit cooler with a slight (20%) chance of showers Saturday, a (30%) chance of showers at night,
• Mostly cloudy with rain likely (60%) Sunday, cloudy with a good (50%) chance of showers Sunday night,
• Then mostly cloudy with showers likely (60%) Monday.
• highs 67-59 warming to 62 Monday lows 45-43. (seasonal averages high 58 low 39).

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Forecast for The South Oregon Coast Including Coos Bay and North Bend:

• Cloudy with showers tonight (0.25 in. of rain possible) and Tuesday AM, a good (50%) chance of showers in the afternoon, mostly cloudy with a (30%) chance of showers with patchy fog Tuesday night (under 0.10 in. of rain possible),
• Mostly cloudy with patchy AM fog, a bit warmer with a slight (20 %) chance of showers Wednesday afternoon (under 0.10 in. of rain possible), just partly cloudy with patchy fog late Wednesday night,
• Partly cloudy with patchy AM fog, mostly sunny and a bit warmer Thursday afternoon, then mostly clear at night.
• lows near 43 highs 54-64.
• Mostly sunny and a bit cooler Friday, mostly clear Friday night,
• Mostly cloudy with a (30%) chance of showers and a bit cooler Saturday and at night,
• Mostly cloudy with rain likely (60%) Sunday, then showers likely (70%) Sunday night and Monday.
• highs 62-57 lows near 47. (seasonal averages high 54 low 42).

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Forecast for the Cascades in Lane County:

• Mostly cloudy with rain and snow showers tonight (0.50 in. of rain possible, 2-5 in. of snow possible),
• Cloudy with rain and snow showers Tuesday (0.25 in. of rain possible, 2-5 in. of snow possible), a good (50%) chance of rain and snow showers Tuesday night (0.10 in. of rain possible),
•  Cloudy with a slight (20%) chance of AM rain and snow showers, a mix of clouds and sun and a bit warmer with a slight (20%) chance of rain and snow showers Wednesday afternoon, just mostly clear Wednesday night,
• Sunny and a bit warmer Thursday, then clear at night.
• snow level 3,000 ft. tonight and Tuesday, 4,000 ft. Tuesday night, 4,500 ft. Wednesday, free air freezing level 7,000 ft. Wednesday night, 8,000 ft. Thursday, then 9,000 ft. Thursday night.
• lows 25-28 highs 34-45.
• Mostly sunny and a bit warmer Friday, partly cloudy Friday night,
• A mix of clouds and sun with a slight (20%) chance of rain Saturday, a (30%) chance of showers at night,
• Mostly cloudy with rain likely (60%) and a bit cooler Sunday, a good (50%) chance of showers at night,
• Then cloudy with a good (50%) chance of rain and snow showers Monday.
• free air freezing level 8,000 ft. Thursday, 9,000 ft. Thursday night, 8,000 ft. Friday, 9,000 ft. Friday night, snow level 7,500 ft. Saturday and Saturday night, 6,500 ft. Sunday, 6,000 ft. Sunday night, then 5,000 ft. Monday.
• highs 46-42 lows 35-32.

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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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