Check out my latest Eugene Daily News Weather Or Not column
http://eugenedailynews.com/2017/12/favorite-christmas-hymn-favorite/
__________
Here is my weekly weather quiz question for the last time. What is “Condensation?” Here is the correct answer. Condensation is in general, the physical process by which a vapor becomes a liquid or solid; the opposite of evaporation, although on the molecular scale, both processes are always occurring. I’ll have a new weekly weather question for you starting Monday. The first person to post the correct answer as a comment on this page will win a week of free personalized weather forecasts tailored to your needs. Good luck.
________________
An Upper Level Low Pressure Trough (Shaded “U” shape with blue arrows) has taken control as Upper Level High Pressure (Shaded “U” shape with blue arrows) offshore moved eastward and weakens. The graphics for days days 1-3 show the complex frontal system moving into Oregon. The graphics for days 3-7 show new complex frontal systems approaching the Pacific Northwest through next Saturday.
NOTE: Hoodoo Ski Area opened Friday.
________________
Air Quality Index:
Eugene/Springfield: The Air Quality Index is 62 in the Moderate category measuring Particulate Matter.
Oakridge: The Air Quality Index is 43 in the Good category measuring Particulate Matter.
Cottage Grove: The Air Quality Index is 47 in the Good category measuring Particulate Matter.
Data courtesy of Lane Regional Air Protection Agency (LRAPA)
__________________
Home Wood Heating Advisory:
(Posted Daily)
Eugene-Springfield: GREEN – Burning Is Allowed.
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
________________
Advisories:
- A WINTER WEATHER ADVISORY IS IN EFFECT UNTIL 1 AM MONDAY FOR THE COAST RANGE OF NORTHWEST OREGON AND THE GREATER PORTLAND METRO AREA, THE NORTHERN OREGON CASCADE FOOTHILLS.
- A WINTER WEATHER ADVISORY IS IN EFFECT UNTIL 10 PM TONIGHT FOR THE LOWER COLUMBIA, AND THE SOUTH WILLAMETTE VALLEY.
- A WINTER STORM WARNING IS IN EFFECT UNTIL 10 AM MONDAY FOR THE WESTERN COLUMBIA RIVER GORGE, THE CENTRAL COLUMBIA RIVER GORGE, AND THE UPPER HOOD RIVER VALLEY
- A PERMANENT HEALTH ADVISORY REMAINS IN EFFECT FOR THE SOUTH UMPQUA RIVER 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.
________________
Forecast for the Southern and lower Mid Willamette Valley including Eugene-Springfield and Albany-Corvallis:
- Cloudy with rain likely (70%) this evening, a (40%) chance of rain late tonight (0.10 in. of rain possible),
- Mostly cloudy with a (40%) chance of AM rain, a slight (20%) chance of showers and a bit warmer Monday afternoon (Christmas Day), mostly cloudy in the evening, partly cloudy and colder late at night,
- Patchy AM fog, mostly cloudy and a bit cooler with a slight (20%) chance of rain Tuesday afternoon, rain likely (70%) and a bit warmer Tuesday night and Wednesday, then mostly cloudy with a (30%) chance of rain Wednesday night.
- lows 36-29 warming to 42 Wednesday night highs 46-39 warming back to 46 Wednesday.
- Mostly cloudy and a bit warmer with a (40%) chance of rain Thursday, a good (50%) chance of rain and a bit warmer Thursday night and Friday, a (40%) chance of rain Friday night,
- Mostly cloudy and a bit cooler with a (40%) chance of rain Saturday, then a slight (20%) chance of rain and a bit cooler Saturday night and Sunday.
- highs 48-52 cooling to 46 Sunday lows 44-36 (seasonal averages high 45 low 33)
_________________
Forecast for Roseburg:
- Cloudy with rain this evening, a (40%) chance of rain late tonight (under 0.10 in. of rain possible),
- Mostly cloudy with patchy fog and a slight (20%) chance of AM showers, just mostly cloudy and a bit warmer Monday afternoon (Christmas Day), mostly cloudy with patchy fog and freezing fog late at night and Tuesday AM, mostly cloudy and a bit cooler in the afternoon, a good (50%) chance of rain Tuesday night,
- Mostly cloudy and a bit warmer with a (30%) chance of rain Wednesday, a slight (20%) chance of rain Wednesday night.
- lows 42-32 warming to 40 Tuesday night cooling to 38 Wednesday night highs 45-42 warming back to 45 Wednesday.
- Mostly cloudy with (30%) chance of rain Thursday through Friday night,
- Then mostly cloudy with a slight (20%) chance of rain and a bit cooler Saturday through Sunday.
- highs 46-45 lows 38-43 cooling back to 38 Saturday night. (seasonal averages high 48 low 36)
_____________________
Forecast for The South Oregon Coast Including Coos Bay and North Bend:
- Mostly cloudy with rain this evening, a good (50%) chance of rain late tonight (under 0.10 in. of rain possible),
- Mostly cloudy with a slight (20%) chance of showers Monday AM (Christmas Day), just partly cloudy in the afternoon at night with patchy fog late at night and Tuesday AM, a (30%) chance of rain and a bit warmer in the afternoon, a good (50%) chance of rain Tuesday night,
- Mostly cloudy and bit warmer with a (30%) chance of rain Wednesday, then a slight (20%) chance of rain at night.
- lows 43-34 warming to 45 Wednesday night highs 50-52.
- Mostly cloudy and bit warmer with a (30%) chance of rain Thursday through Saturday, then mostly cloudy with a slight (20%) chance of rain Saturday night and Sunday.
- highs 54-52 warming back to 54 Sunday lows 49-42. (seasonal averages high 51 low 40)
________________
Forecast for the Cascades in Lane County:
- Cloudy with rain and snow likely (70%) late tonight (0.25 in. of rain possible, 2-5 in. of snow possible),
- A mix of clouds and sun and a bit cooler with a good (50%) chance of rain and snow showers Monday afternoon (Christmas Day), just partly cloudy at night,
- A mix of clouds and sun with a slight (20%) chance of snow and a bit warmer Tuesday afternoon, rain and snow likely (70%) late Tuesday night,
- Mostly cloudy with rain and snow likely (70%) Wednesday, then mostly cloudy with a (30%) chance of rain and snow Wednesday night.
- snow level 5,500 ft. tonight, 3,500 ft. Monday, free air freezing level 4,000 ft. falling to the surface late Monday night, snow level 3,000 ft. Tuesday afternoon, snow level 4,500 ft. Tuesday night, then 5,000 ft. Wednesday and Wednesday night.
- lows 26-22 warming back to 26 Wednesday night highs 32-35.
- Mostly cloudy with a (30%) chance of rain and snow and a bit warmer Thursday, a good (50%) chance of rain and snow Thursday night and Friday,
- A good (50%) chance of rain and snow and a bit warmer Friday, a (40%) chance of rain and snow at night and Saturday, then mostly cloudy and a bit cooler with a slight (20%) chance of rain and snow Friday night and Saturday
- snow level 4,000 ft. Thursday, 6,000 ft. Thursday night, 6,500 ft. Friday, 5,500 ft. Friday night, 4,000 ft. Saturday, 5,500 ft. Saturday night, then 4,500 ft. Sunday.
- highs 38-40 cooling to 36 Saturday lows 33-26.
________________
**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.
________________