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.

________________

An upper air low pressure trough (Shaded “U” shape with blue arrows is still in control of our weather, But a high pressure ridge (Shaded “Arch” shape with blue arrows) will fall in behind returning the much missed sunshine for a while. The days 1-3 graphic shows the storm that brought all of the moisture to mix with cold air to produce the icy weather over all of our area has moved away. With overnight and early AM temperatures remaining well below freezing, I’m afraid more trees and branches will most likely fall. The graphic for days 3-7 shows the next storm headed our way Tuesday and another one moving toward us next Thursday. For mountain snow conditions at the local ski areas check out their websites or give them a call. With the potential of significant snowfall and mixed precipitation you’d be wise to judge carefully when and if you need to drive during the next 12 hours or so of this storm.

________________

Air Quality Index:

Eugene-Springfield: The Air Quality Index is 36 in the Good category measuring Particulate Matter.

Oakridge: The Air Quality Index is 18 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 42 in the Good category measuring Particulate Matter.

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

________________

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)

________________

Advisories:

• A WINTER WEATHER ADVISORY IS IN EFFECT UNTIL 10 PM TODAY FOR THE LOWER COLUMBIA, THE GREATER PORTLAND METRO AREA, AND THE CENTRAL WILLAMETTE VALLEY.
• 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.
• A Blue-Green Algae Health Advisory HAS BEEN CANCELLED for Agency Lake. Agency Lake is located just north of Upper Klamath Lake near Klamath Falls along Highway 97 in Klamath County. Water monitoring on the lake has confirmed the blue-green algae bloom is no longer present.

 

________________

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

• Mostly cloudy and a bit warmer with occasional snow flurries this afternoon, a slight (20%) chance of rain and snow showers patchy light freezing drizzle this evening,
• Just mostly cloudy Sunday, a slight (20%) chance of rain late at night,
• Mostly cloudy and a bit warmer with rain Monday, then rain, possibly heavy at times, Monday night.
• highs 35-46 lows 25-40.
• Mostly cloudy with rain and a bit warmer Tuesday, a slight (20%) chance of showers at night,
• Partly cloudy with a slight (20%) chance of showers and a bit cooler Wednesday, mostly cloudy with a good (50%) chance of rain Wednesday night,
• Mostly cloudy with rain likely (70%) Thursday, then showers likely (70%) Thursday night and Friday.
• highs 48-44 lows near 35. (seasonal averages high 45 low 33)

 

_____________________

Forecast for Roseburg:

• Partly cloudy and a bit warmer this afternoon, mostly cloudy tonight through Sunday night,
• Mostly cloudy with a slight (20%) chance of AM rain, rain and a bit warmer Monday, cloudy with a good (50%) chance of evening rain, then rain Monday night.
• highs 39-47 lows 27-38.
• Mostly cloudy with rain and a bit warmer Tuesday, a (30%) chance of showers Tuesday evening, just mostly cloudy at night,
• Partly cloudy and a bit cooler Wednesday, mostly cloudy with a (40%) chance of rain at night,
• Rain likely (70%) and a bit warmer Thursday, evening showers, rain and snow showers late Thursday night,
• Then rain and snow showers likely (70%) and a bit cooler Friday.
• highs 48-44 warming back to 48 Thursday cooling to 42 Friday lows near 37. (seasonal averages high 47 low 36)

 

________________

 

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

• Partly cloudy and a bit warmer inland this afternoon, mostly cloudy tonight through Sunday night,
• Mostly cloudy with a (30%) chance of rain and a bit warmer Monday, cloudy with a (40%) chance of evening rain, then rain late Monday night.
• highs 45-50 lows 32-45.
• Mostly cloudy and a bit warmer with rain and breezy Tuesday, a (30%) chance of showers Tuesday evening, just mostly cloudy at night,
• Partly cloudy and a bit cooler Wednesday, mostly cloudy with a good (50%) chance of rain at night,
• Rain likely (70%) and a bit cooler Thursday, showers Thursday night,
• Then showers likely (70%) and a bit cooler Friday.
• highs 53-47 lows 38-43 cooling back to 38 Thursday night. (seasonal averages high 51 low 39)

 

________________

 

Forecast for the Cascades in Lane County:

• Mostly cloudy with a slight (20%) chance of snow showers and a bit warmer this afternoon, cold with a (40%) chance of evening snow showers, a slight (20%) chance of snow showers late tonight,
• A mix of clouds and sun and a bit warmer Sunday, just mostly cloudy at night,
• Cloudy with a good (50%) chance of AM snow, snow and rain and a bit warmer Monday afternoon, then rain and snow Monday night.
• snow level at the surface today and tonight, free air freezing level at the surface Sunday and Sunday night, snow level 2,500 ft. Monday, then 6,000 ft. Monday night.
• highs 25-35 lows 10-28.
• Cloudy with rain and a bit warmer Tuesday, mostly cloudy with a good (50%) chance of rain and snow showers Tuesday night,
• Just partly cloudy and a bit cooler Wednesday, mostly cloudy with a good (50%) chance of rain and snow  Wednesday night,
• Mostly cloudy and a bit cooler with rain and snow likely (70%) Thursday, rain and snow showers at night,
• Then snow showers likely (60%) and a bit cooler Friday.
• snow level 6,500 ft. Tuesday, 4,000 ft. Tuesday night, free air freezing level 5,500 ft. Wednesday, snow level 5,000 ft. Wednesday night, 4,000 ft. Thursday, 2,500 ft. Thursday night, then at the surface Friday.
• highs 35-32 lows 22-25 cooling back to 22 Thursday night.

 

________________

**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.

__________