Here is my weekly weather quiz question for the last time. What is an“Acre-foot?” Here is the correct answer. An Acre-foot is the amount of water required to cover one acre to a depth of one foot. An acre-foot equals 326,851 gallons, or 43,560 cubic feet. I’ll have a new weekly weather quiz question for you starting Monday. Please remember to post your answer at the bottom of this page. An email will not suffice. The first person to post the correct answer will win a week of free personalized weather forecasts tailored to your needs.  Good luck.

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An upper level high pressure ridge (Shaded “Arch” shape with blue arrows) will be sending us airflow from the Northwest then another upper level trough of low pressure (Shaded “U” shape with blue arrows) moves in behind it. The days 1-3 graphic shows the storm that moisture will still be moving over us with some warmer air. A lot of the ice melted Saturday, but cold overnight temperatures could freeze what is still wet this morning. The combination of the branches rising with melting and being refrozen could result in more trees and branches  falling. The graphic for days 3-7 shows the next storms headed our way Tuesday and Thursday. For mountain snow conditions at the local ski areas check out their websites or give them a call.

Note: Just in case you haven’t noticed “THIS ISN”T WINTER YET!” The Winter Solstice falls on Thursday December 22nd at 2:44 AM PST. I hope this current weather pattern isn’t the precursor to a very active Winter Storm season.

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Air Quality Index:

Eugene-Springfield: The Air Quality Index is 55 in the Moderate category measuring Particulate Matter.

Oakridge: The Air Quality Index is 36 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 28 in the Good category measuring Particulate Matter.

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

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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.

Data courtesy of Lane Regional Air Protection Agency (LRAPA)

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Advisories:

• A Permanent Health Advisory remains in effect for the South Umpqua River and Lawson Bar. Pools in the bedrock along the rivers edge are known to develop Blue-green Algae (cyanobacterial) blooms that can be harmful to pets and people if accidental ingestion occurs. Signs have been posted along several access areas along the river.

 

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

• Areas AM freezing fog, mostly cloudy with sun breaks this afternoon, mostly cloudy with a (30%) chance of rain or snow late tonight (0.10 in. of rain possible),
• Mostly cloudy and a bit warmer with rain Monday (0.50 in. of rain possible), rain, possibly heavy at times, Monday night (0.75 in. of rain possible),
• Mostly cloudy with AM rain, a good (50%) chance of rain and a bit warmer Tuesday afternoon, a slight (20%) chance of evening showers, just mostly cloudy at night.
• highs 34-50 lows 32-42 cooling to 35 Tuesday night.
• A mix of clouds and sun and a bit cooler with patchy fog Wednesday, becoming cloudy with a good (50%) chance of rain late Wednesday night,
• Mostly cloudy and a bit warmer with rain likely (70%) Thursday, showers likely (70%) at night,
• A good (50%) chance of showers Friday, a (40%) chance of showers Friday night,
• Then cloudy with a good (50%) chance of showers Saturday.
• highs near 43 lows near 35. (seasonal averages high 45 low 33)

 

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Forecast for Roseburg:

• Partly cloudy with patchy AM freezing fog, partly cloudy and a bit warmer this afternoon, mostly cloudy tonight,
• Cloudy  with AM rain and snow (snow level 1,500 ft rising to 3,500 ft), rain and a bit warmer Monday afternoon (0.25 in. of rain possible), cloudy with rain Monday night (0.25 in. of rain possible),
• Mostly cloudy with AM rain, partly cloudy with a good (50%) chance of rain and a bit warmer Tuesday afternoon (0.50 in. of rain possible), partly cloudy with a slight (20%) chance of showers Tuesday evening, then just partly cloudy at night.
• highs 38-50 lows 32-43 cooling to 36 Tuesday night.
• Partly cloudy and a bit cooler Wednesday, mostly cloudy with a (40%) chance of rain at night,
• AM rain, showers and a bit warmer Thursday afternoon, evening showers likely (70%), rain and snow showers likely (70%) late Thursday night,
• Mostly cloudy with a (40%) chance of  rain and snow showers and a bit cooler Friday and Friday night,
• Then cloudy with a (30%) chance of showers Saturday.
• highs 43-47  Saturday lows 36-38 cooling to 44 Thursday night and Friday night. (seasonal averages high 47 low 36)

 

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

• Partly cloudy with areas of AM coastal frost while patchy freezing fog inland, mostly cloudy and a bit warmer this afternoon, a slight (20%) chance of coastal rain tonight,
• Cloudy with AM coastal rain Monday and a bit warmer with a good (50%) chance of afternoon rain while AM inland rain likely (70%) and inland afternoon rain (0.25 in. of rain possible), rain and breezy (Wind: S 20-30 mph at the shore while S 10-20 mph inland, gusts to 40 mph late) Monday night (0.75 in. of rain possible),
• Mostly cloudy with AM rain, partly cloudy with a good (50%) chance of afternoon rain and breezy (Wind: SW 15-20 mph shifting to W 10-15 mph in the afternoon) Tuesday (0.75 in. of rain possible), partly cloudy with a slight (20%) chance of evening showers, then just partly cloudy and colder at night.
• highs 48-54 lows 36-46 cooling back to 36 Tuesday night.
• Partly cloudy and a bit cooler Wednesday, mostly cloudy with rain becoming likely (70%) late at night,
• Rain Thursday AM, showers and a bit cooler in the afternoon, showers likely (70%) Thursday night,
• Mostly cloudy with a (40%) chance of showers and a bit cooler Friday and at night,
• Then cloudy with a (30%) chance of showers Saturday.
• highs 53-48 lows 42-39.(seasonal averages high 51 low 39)

 

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Forecast for the Cascades in Lane County:

• A mix of clouds and sun and a bit warmer today, just mostly cloudy tonight,
• Mostly cloudy with AM snow likely (70%), snow and rain and a bit warmer Monday afternoon (0.50 in. of rain possible, 2-4 in. of snow possible), rain Monday night and Tuesday AM, rain and snow and a bit warmer Tuesday afternoon, mostly cloudy with a good (50%) chance of rain and snow showers in the evening, a slight (20%) chance of rain and snow showers Tuesday night.
• free air freezing level at the surface today, 3,000 ft. tonight, snow level 2,500 ft. rising to 3,500 ft. Monday afternoon, 7,000 ft. Monday night,7,000 ft. falling to 4,000 ft. Tuesday afternoon, then 3,500 ft. Tuesday night.
• highs 30-36 lows 22-32 cooling back to 22 Tuesday night.
• Mostly sunny and a bit cooler Wednesday, becoming cloudy with a good (50%) chance of rain and snow  late Wednesday night,
• Mostly cloudy and a bit cooler with rain and snow Thursday, snow showers at night,
• A good (50%) chance of snow showers Friday, a (40%) chance of snow showers Friday night,
• Then mostly cloudy with a good (50%) chance of snow showers Saturday.
• free air freezing level at the surface Wednesday, snow level 5,000 ft. Wednesday night, 3,500 ft. Thursday, 2,500 ft. Thursday night, at the surface Friday and Friday night, then 2,500 ft. Saturday.
• highs 35-32 lows 25-22.

 

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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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