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 7 in the Good category measuring Particulate Matter.

Oakridge: The Air Quality Index is 8 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 HIGH SURF ADVISORY IS IN EFFECT UNTIL 10 PM TONIGHT FOR THE NORTH OREGON COAST AND THE CENTRAL OREGON COAST.
• A WINTER STORM WARNING IS IN EFFECT FROM UNTIL NOON MONDAY FOR THE NORTHERN OREGON CASCADES AND THE CASCADES IN LANE COUNTY.
• A FLOOD WATCH IS IN EFFECT THROUGH LATE TONIGHT FOR THE SOUTH CENTRAL OREGON COAST, THE CURRY COUNTY COAST, CENTRAL DOUGLAS COUNTY, EASTERN CURRY COUNTY, AND JOSEPHINE COUNTY.
• A HIGH SURF ADVISORY IS IN EFFECT FROM 8 PM TONIGHT UNTIL 8 AM MONDAY FOR THE SOUTH CENTRAL OREGON COAST AND THE CURRY COUNTY COAST.
• A WINTER STORM WARNING IS IN EFFECT UNTIL 11 PM MONDAY  FOR THE SOUTH CENTRAL OREGON CASCADES, THE SOUTHERN OREGON CASCADES AND THE SISKIYOU MOUNTAINS.
• A WIND ADVISORY IS IN EFFECT UNTIL 8 PM TONIGHT FOR CENTRAL DOUGLAS COUNTY, EASTERN CURRY COUNTY, JOSEPHINE COUNTY, THE EASTERN DOUGLAS COUNTY FOOTHILLS, AND JACKSON COUNTY.
• A HIGH WIND WARNING IS IN EFFECT UNTIL 11 PM MONDAY FOR THE KLAMATH BASIN, NORTHERN AND EASTERN KLAMATH COUNTY, AND CENTRAL, EASTERN AND WESTERN LAKE COUNTY.
• A WINTER WEATHER ADVISORY IS IN EFFECT FROM 5 AM UNTIL 5 PM MONDAY FOR  EASTERN CURRY COUNTY, JOSEPHINE COUNTY, THE EASTERN DOUGLAS COUNTY FOOTHILLS, AND JACKSON COUNTY.
• A WINTER WEATHER ADVISORY IS IN EFFECT UNTIL 5 PM MONDAY FOR THE KLAMATH BASIN, AND NORTHERN AND EASTERN KLAMATH COUNTY.

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

• Mostly cloudy with showers tonight (0.50 in. of rain possible),
• Showers and cooler Monday (0.50 in. of rain possible), showers likely (70%) at night (0.25 in. of rain possible),
• Cloudy with showers likely (70%) Tuesday AM, a bit warmer with a good (50%) chance of showers in the afternoon (0.25 in. of rain possible), then mostly cloudy with a good (50%) chance of showers Tuesday night (under 0.10 in. of rain possible),
• A mix of clouds and sun and a bit warmer with a slight (20%) chance of showers Wednesday, then just partly cloudy with patchy fog Wednesday night.
• lows 40-36  highs near 49-55.
• Patchy AM fog, mostly sunny and a bit warmer Thursday and Friday, mostly clear both nights,
• A mix of clouds and sun and a bit cooler with a (40%) chance of showers Saturday, mostly cloudy with a good (50%) chance of showers at night,
• Then cloudy and a bit cooler with a good (50%) chance of rain Sunday.
• highs 62-65 cooling to 60 Sunday lows 35-45. (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 rain and snow showers tonight (0.40 in. of rain possible, 1-2 in. of snow possible, snow level 2,500 ft.),
• Rain and snow showers and a bit cooler Monday (0.30 in. of rain possible, snow level 2,500 ft,), cloudy with rain and snow showers in the evening, a good (50%) rain and snow showers late Monday night (0.15 in. of rain possible, snow level 3,000 ft. falling to 2,500 ft. late at night),
• Mostly cloudy with AM rain and snow showers likely (70%), a (40%) chance of rain and snow showers and a bit warmer Tuesday afternoon (0.10 in. of rain possible), a (30%) chance of showers at night (under 0.10 in. of rain possible),
• Mostly cloudy with patchy fog Wednesday AM, mostly sunny and a bit warmer Wednesday afternoon, then just mostly clear Wednesday night.
• lows near 38 highs 50-58.
• Patchy mainly AM and late night fog and mostly sunny and a bit warmer Thursday and Friday, mostly clear both nights,
• Mostly cloudy and a bit cooler with a (30%) chance of showers Saturday and Saturday night,
  Then cloudy with a good (50%) chance of rain Sunday.
• highs 63-68 cooling to 58 Saturday and Sunday lows 38-44. (seasonal averages high 57 low 39).

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

• Mostly cloudy with showers tonight (0.50 in. of rain possible) and Monday (0.40 in. of rain possible), cloudy with evening showers, coastal showers likely (70%) Monday night while (50%) chance of inland showers late at night (0.25 in. of rain possible),
• Mostly cloudy with AM showers likely (70%), a slight (20%) chance of showers and a bit warmer Tuesday afternoon (under 0.10 in. of rain possible),  a (30%) chance of showers Tuesday night (under 0.10 in. of rain possible),
• Mostly cloudy with patchy AM fog, sunny and a bit warmer Wednesday afternoon, then just mostly clear Wednesday night.
• lows 42-44 cooling back to 42 Wednesday night highs 50-56.
• Mostly sunny and a bit warmer Thursday and Friday, mostly clear Thursday night, partly cloudy Friday night,
• Mostly cloudy with a (30%) chance of showers and a bit cooler Saturday and at night.
• Then cloudy with a a good (50%) chance of rain Sunday.
• highs 62-65 cooling to 56 Saturday and Sunday lows 44-47. (seasonal averages high 54 low 41).

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Forecast for the Cascades in Lane County:

• Mostly cloudy with rain and snow showers tonight (0.75 in. of rain possible, 5-10 in. of snow possible),
• Mostly cloudy with snow showers and a bit cooler Monday (4-8 in. of snow possible), rain and snow showers in the evening, snow showers late at night (0.50 in. of rain possible, 2-5 in. of snow possible),
• Cloudy with AM snow showers likely (60%) Tuesday, a bit warmer with a good (50%) chance of rain and snow showers in the afternoon, cloudy with a (30%) chance of showers Tuesday night.
• Mostly cloudy and a bit warmer with a slight (20%) chance of rain and snow showers Wednesday, then just mostly clear Wednesday night.
• snow level 4,000 ft. falling to 3,000 ft. late tonight, 2,500 ft. Monday through Tuesday, 4,000 ft. Tuesday night, 4,500 ft. Wednesday, then free air freezing level 7,000 ft. Wednesday night.
• lows24-26 highs 32-42.
• Mostly sunny and a bit warmer Thursday and Friday, mostly clear both nights,
• A mix of clouds and sun and a bit warmer with a slight (20%) chance of rain Saturday, mostly cloudy with a good (50%) chance of showers at night,
• Then mostly cloudy with rain likely (60%) and a bit cooler Sunday.
• free air freezing level 8,000 ft. Thursday, 9,000 ft. Thursday night, 10,000 ft. Friday, 9,000 ft. Friday night, snow level 7,000 ft. Saturday, 7,500 ft. Saturday  night, then 6,500 ft. Sunday.
• highs 45-50 cooling to 42 Sunday lows 28-33.

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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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