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.

________________

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. Again, more storms head our way as a frontal system approaches the coast Tuesday. By Tuesday 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.

________________

Air Quality Index:

Eugene-Springfield: The Air Quality Index is 32 in the Good category measuring Particulate Matter.

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

Cottage Grove: The Air Quality Index is 32 in the Good category measuring Particulate Matter.

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

________________

Advisories:

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

________________

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

• Clear and cold tonight,
• Sunny Saturday, partly cloudy Saturday night,
• Cloudy with a slight (20%) chance of AM freezing rain 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 Monday AM, a (40%) chance of afternoon rain, then cloudy with a good (50%) chance of rain Monday night.
• lows 26-36 highs 40-45.
• 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 45 low 34)

_____

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).

___________________

Forecast for Roseburg:

• Clear with areas of fog and freezing fog late tonight,
• Areas of AM fog and freezing fog Saturday, sunny with patchy lingering fog in the 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 Saturday night (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, a (30%) chance of rain Sunday night,
• Cloudy with a (40%) chance of rain and warmer Monday and Monday night
• lows 23-42 highs 40-50.
• 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)

________________

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

• Clear with areas of inland patchy fog and freezing fog late tonight and Saturday AM, sunny in the afternoon, partly cloudy in the evening with a (40%) chance of coastal rain tonight, while mostly cloudy with a (40%) chance of inland rain late Saturday night,
• 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.
• lows 32-47 highs 50-54.
• 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).

________________

Forecast for the Cascades in Lane County:

• Clear and cold tonight and breezy (Wind: SE 15-25 mph gusts to 35 mph),
• Sunny Saturday, partly cloudy in the evening, mostly cloudy and cold with a slight (20%) chance of snow late at night (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 tonight through Saturday night, 3,500 ft. Sunday, 4,000 ft. Sunday night, 4,500 ft. Monday, then 5,500 ft. Monday night.
• lows 13-29 highs 29-34.
• 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.

________________

**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.

________________