Here is my new weekly weather quiz question. What is “Deep Percolation Loss?” 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) takes over clearing the skies for some drying time, but also colder temperatures. Again, more storms head our way as a frontal system approaches the coast Sunday. 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 40 in the Good category measuring Particulate Matter.

Oakridge: The Air Quality Index is 53 in the Moderate category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 48 in the Good category measuring Particulate Matter.

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

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Advisories:

• AN AIR STAGNATION ADVISORY IS IN EFFECT UNTIL 9 AM MONDAY FOR THE LOWER COLUMBIA AND THE SOUTH WILLAMETTE VALLEY.
• A WIND ADVISORY IS IN EFFECT UNTIL NOON SATURDAY FOR THE GREATER PORTLAND METRO AREA.
• A WIND ADVISORY IS IN EFFECT FROM 10 PM TONIGHT UNTIL 10 AM FRIDAY FOR JACKSON COUNTY.
• A FREEZE WARNING IS IN EFECT FROM 2 AM FRIDAY UNTIL 8 AM SATURDAY FOR THE SOUTH CENTRAL OREGON COAST AND THE CURRY COUNTY COAST.
• A WIND CHILL WARNING IS IN EFFECT FROM 10 PM TONIGHT UNTIL 9 AM FRIDAY FOR THE KLAMATH BASIN, NORTHERN AND EASTERN KLAMATH COUNTY, AND CENTRAL, EASTERN AND WESTERN LAKE COUNTY.
• A WIND CHILL WATCH IS IN EFFECT FROM FRIDAY EVENING THROUGH SATURDAY MORNING FOR THE KLAMATH BASIN, NORTHERN AND EASTERN KLAMATH COUNTY, AND CENTRAL, EASTERN AND WESTERN LAKE COUNTY.
• A WIND CHILL WATCH IS IN EFFECT FROM FRIDAY EVENING THROUGH SATURDAY MORNING FOR NORTHERN AND EASTERN KLAMATH COUNTY, AND CENTRAL, EASTERN AND WESTERN LAKE COUNTY.
• AN AIR STAGNATION ADVISORY IS IN EFFECT UNTIL 10 AM SATURDAY FOR CENTRAL DOUGLAS COUNTY, EASTERN CURRY COUNTY, JOSEPHINE COUNTY, AND JACKSON COUNTY.

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Forecast for the Southern and lower Mid Willamette Valley including Eugene-

• Mostly cloudy with areas of fog and freezing fog this evening,  clear with areas of fog and freezing fog late tonight (New Year’s Eve),
• Sunny with patchy AM fog and freezing fog and becoming sunny Friday afternoon (New Year’s Day) East of I-5 while mostly cloudy with AM fog and freezing fog West of I-5 and sunny in the afternoon, partly cloudy in the evening and mostly cloudy with patchy fog and freezing fog Friday night East of I-5 while mostly cloudy and cold with patchy fog and freezing fog late at night West of I-5,
• AM clouds and sun and with areas of freezing fog and mostly sunny Saturday afternoon East of I-5 while mostly cloudy with AM freezing fog then patchy afternoon fog West of I-5, mostly cloudy with patchy evening fog and freezing fog, areas of fog and freezing fog late Saturday night,
• Mostly cloudy with freezing fog and a slight (20%) chance of AM showers or freezing rain Sunday, a (40%) chance of rain Sunday night.
• lows 26-23 warming to 32 Sunday night highs 37-40.
• Cloudy and a bit warmer with a good (50%) chance of rain Monday and Monday night,
• Mostly cloudy with rain likely (70%) Tuesday and at night,
• Cloudy with a (40%) chance of rain Wednesday and Wednesday night,
• Then cloudy with a slight (20%) chance of rain Thursday.
• highs 43-45 lows near 35. (seasonal averages high 45 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:

• Clear with patchy fog and freezing fog late tonight (New Year’s Eve),
• Patchy AM fog and freezing fog, sunny and a bit warmer Friday afternoon (New Year’s Day), clear with areas of fog and freezing fog  late Friday night,
• Areas of AM fog and freezing fog Saturday, sunny with patchy lingering fog in the afternoon, partly cloudy with a slight (20%) chance of rain and snow in the evening, mostly cloudy with a (30%) chance of rain and snow and a slight (20%) chance of light freezing rain late Saturday night (snow level 600 ft. late at night),
• Mostly cloudy with a (40%) chance of rain and snow and a slight (20%) chance of light freezing rain Sunday AM, mostly cloudy and a bit warmer with a (40%) chance of rain in the afternoon and Sunday night.
• lows 28-25 warming to 35 Sunday night highs 39-44.
• Cloudy with a (40%) chance of rain and a bit warmer Monday afternoon, mostly cloudy with rain likely (60%) Monday night through Tuesday evening, then a good (50%) chance of rain late Tuesday night through Wednesday night,
• Then cloudy with a good (50%) chance of rain Thursday.
• highs 47-52 cooling to 50 Thursday lows near 40. (seasonal averages high 48 low 36)

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

• Clear with patchy coastal fog and freezing fog while patchy inland freezing fog late tonight (New Year’s Eve),
• Patchy AM coastal fog and freezing fog while patchy AM freezing fog inland, sunny Friday afternoon (New Year’s Day), clear with areas of inland fog and freezing fog late at night,
• Areas of AM freezing fog inland, sunny Saturday with patchy afternoon lingering fog, partly cloudy in the evening with a (30%) chance of coastal rain,  a slight (20%) chance of evening inland rain, with a (40%) chance of rain and a (30%) chance of freezing rain late Saturday night,
• Mostly cloudy with a (40%) chance of rain Sunday, cloudy with a good (50%) chance of rain Sunday night.
• lows 32-30 warming to 42 Sunday night highs near 50.
• Cloudy and a bit warmer with a good (50%) chance of rain Monday, rain likely (70%) Monday night through Tuesday night,
• Mostly cloudy with a good (50%) chance of  Wednesday and in the evening, then rain likely (60%) Wednesday night and Thursday.
• highs 54-50 lows 45-42. (seasonal averages high 51 low 40).

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Forecast for the Cascades in Lane County:

• Clear tonight while mostly cloudy near the Cascade Crest, breezy (Wind: SE 15-25 mph gusts to 40 mph tonight),
• Sunny Friday (New Year’s Day) while a mix of clouds and sun in the AM and sunny in the afternoon near the Cascade Crest, breezy (Wind: SE 15-25 mph gusts to 40 mph), clear and cold Friday night,
• Sunny Saturday, partly cloudy and cold with a slight (20%) chance of snow showers late at night,
• Mostly cloudy and a bit warmer with a (40%) chance of rain and snow showers Sunday, then a (40%) chance of rain and snow at night.
• free air freezing level at the surface rising to 3,500 ft. late tonight, at the surface rising to 3,500 ft. Friday afternoon, at the surface Saturday, snow level at the surface Saturday night, 2,500 ft. Sunday, then 3,500 ft. Sunday night.
• lows 14-10 warming to near 24 Sunday night highs 27-34.
• Mostly cloudy with a (40%) chance of rain and snow Monday afternoon, a good (50%) chance of rain and snow Monday night,
• Mostly cloudy with a rain and snow likely (70%) Tuesday and Tuesday night,
• Then mostly cloudy with a good (50%) chance of rain and snow Wednesday and Wednesday night,
• Then cloudy with a (40%) chance of rain and snow Thursday.
• snow level 4,000 ft. Monday, 5,000 ft. Monday night through Tuesday night, then 4,000 ft. Wednesday through Thursday.
• highs near 33 lows 28-25.

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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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