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.

________________

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.

________________

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).

________________

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 5 PM TODAY FOR EASTERN CURRC COUNTY, JOSEPHINE COUNTY, THE EASTERN DOUGLAS COUNTY FOOTHILLS, AND JACKSON COUNTY, THE KLAMATH BASIN, AND NORTHERN AND EASTERN KLAMATH COUNTY.
• A WINTER WEATHER ADVISORY IS IN EFFECT UNTIL 11 PM TONIGHT FOR THE SOUTH CENTRAL OREGON CASCADES, THE SOUTHERN OREGON CASCADES AND THE SISKIYOU MOUNTAINS.

________________

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

• Mostly cloudy with showers and cooler today (0.50 in. of rain possible, a slight (20%) chance of afternoon and evening thunderstorms and small hail possible), showers likely (70%) late tonight (0.10 in. of rain possible),
• Mostly cloudy with showers likely (70%) Tuesday AM, a bit warmer with the chance of showers decreasing in the afternoon (under 0.10 in. of rain possible),  mostly cloudy with a (30%) chance of evening showers, patchy fog late Tuesday night (under 0.10 in. of rain possible),
• Patchy AM fog, a mix of clouds and sun and a bit warmer Wednesday, then just mostly clear with patchy fog Wednesday night.
• highs 49-55 lows 40-36.
• Patchy AM fog, mostly sunny and a bit warmer Thursday and Friday, mostly clear Thursday night and partly cloudy Friday night,
• A mix of clouds and sun and a bit cooler with a slight (20%) 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 showers Sunday.
• highs 62-65 cooling to 60 Sunday lows 35-45. (seasonal averages high 56 low 37).

_____

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).

___________________

Forecast for Roseburg:

• Rain and snow showers and a bit cooler today (0.30 in. of rain possible, snow level 2,500 ft,), cloudy with rain and snow showers this evening, a good (50%) rain and snow showers late tonight (0.15 in. of rain possible, snow level 3,000 ft. tonight),
• Mostly cloudy with a (40%) chance of rain and snow showers and a bit warmer Tuesday afternoon (0.10 in. of rain possible, snow level 3,000 ft. rising to 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, a mix of clouds and sun and a bit warmer Wednesday afternoon, then just mostly clear Wednesday night.
• highs 50-58 lows near 38.
• Patchy mainly AM and late night fog and sunny and a bit warmer Thursday and Friday, mostly clear Thursday night, becoming mostly cloudy with a slight (20%) chance of rain Friday night,
• Mostly cloudy and a bit cooler with a (30%) chance of showers Saturday and Saturday night,
• Then cloudy with rain likely (60%) Sunday.
• highs 63-68 cooling to 58 Saturday and Sunday lows 38-44. (seasonal averages high 58 low 39).

________________

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

• Mostly cloudy with showers today (0.40 in. of rain possible), cloudy with evening showers, showers likely (70%) late tonight (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 with patchy fog Tuesday night (under 0.10 in. of rain possible),
• Mostly cloudy with patchy AM fog, a bit warmer Wednesday afternoon, then just partly c loudy Wednesday night.
• highs 50-56 lows 42-44 cooling back to 42 Wednesday night.
• Mostly sunny and a bit warmer Thursday and Friday, mostly clear Thursday night, becoming mostly cloudy with a (40%) chance of showers Friday night,
• Mostly cloudy with a (30%) chance of showers and a bit cooler Saturday and at night.
• Then cloudy with rain likely (60%) chance of rain Sunday.
• highs 62-65 cooling to 56 Saturday and Sunday lows 44-47. (seasonal averages high 54 low 42).

________________

Forecast for the Cascades in Lane County:

• Mostly cloudy with snow showers and a bit cooler today (3-6 in. of snow possible), rain and snow showers with small hail possible this evening, snow showers late tonight (0.50 in. of rain possible, 3-6 in. of snow possible),
• Cloudy with snow showers likely (60%) Tuesday, a bit warmer with a good (50%) chance of rain and snow showers in the afternoon, cloudy with a (40%) chance of rain and snow showers Tuesday night.
• A mix of clouds and sun and a bit warmer with a slight (20%) chance of rain and snow showers Wednesday, then just mostly clear Wednesday night.
• snow level 2,500 ft. today through Tuesday, 4,000 ft. Tuesday night, 5,000 ft. Wednesday, then free air freezing level 7,000 ft. Wednesday night.
• highs 32-42 lows 24-26.
• 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 showers 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 and Saturday night, then 6,500 ft. Sunday.
• highs 45-50 cooling to 42 Sunday lows 28-33.

________________

**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.

________________

Get your local Eugene-Springfield and Lane County news on-line at eugenedailynews.com.

________________