Check out my latest Eugene Daily News Weather Or Not column:
http://eugenedailynews.com/2017/12/promise-promise-not-awh-forget/
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Here is my weekly weather quiz question for the last time. What are “Convective Clouds?” Here is the correct answer. Convective Clouds- the vertically developed family of clouds are cumulus and cumulonimbus. The height of their bases range from as low as 1,000 feet to a bit more than 10,000 feet. Clouds with extensive vertical development are positive indications of unstable air. Strong upward currents in vertically developed clouds can carry high concentrations of supercooled water to high levels where temperatures are quite cold. Upper portions of these clouds may be composed of water and ice. I’ll have a new weekly weather quiz 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.
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Upper Level High Pressure (Shaded “Arch” shape with blue arrows) weakens its hold on us but keeps the serious rain away for the rest of the weekend. An Upper Level Low Pressure Trough moves in to increase the rain chances. The graphics for days 1-3 show the frontal system that is moving toward us by the end of the weekend. The graphics for days 3-7 show the next frontal systems heading our way Wednesday through next Sunday.
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Air Quality Index:
Eugene/Springfield: The Air Quality Index is 8 in the Good category measuring Particulate Matter.
Oakridge: The Air Quality Index is 59 in the Moderate category measuring Particulate Matter.
Cottage Grove: The Air Quality Index is 38 in the Good category measuring Particulate Matter.
Data courtesy of Lane Regional Air Protection Agency (LRAPA)
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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 (LRAPA)
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Advisories:
- 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.
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Forecast for the Southern and lower Mid Willamette Valley including Eugene-Springfield and Albany-Corvallis:
- Partly cloudy this evening, mostly cloudy with areas of fog late tonight,
- Patchy fog with a slight (20%) chance of rain Sunday AM, mostly cloudy and a bit cooler with a (20%) chance of rain in the afternoon and evening (under 0.10 in. of rain possible), a slight (20%) chance of rain late Sunday night (under 0.10 in. of rain possible),
- Mostly cloudy with a slight (20%) chance of AM rain, rain likely (70%) and a bit cooler Monday afternoon through Tuesday AM, showers likely (70%) and a bit warmer in the afternoon, then a good (50%) chance of showers Tuesday night.
- lows 36-33 warming back to 36 Monday night cooling to 35 Tuesday night highs 47-44 warming back to 47 Tuesday.
- Mostly cloudy and a bit cooler with rain likely (70%) Wednesday, a good (50%) chance of rain at night,
- Cloudy and a bit warmer with rain likely (70%) and a bit warmer Thursday, showers likely (70%) Thursday night,
- Mostly cloudy with a (40%) chance of showers and a bit warmer Friday, a slight (20%) chance of showers at night,
- Then just partly cloudy and bit cooler Saturday.
- highs 46-50 cooling to 48 Saturday lows 38-36. (seasonal averages high 46 low 34)
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Forecast for Roseburg:
- Mostly cloudy with areas of fog late tonight and Sunday AM, a slight (20%) chance of rain in the afternoon and evening, just mostly cloudy late Sunday night,
- Cloudy with a slight (20%) chance of AM rain, rain likely (70%) Monday afternoon, evening rain, rain likely (70%) late at night,
- Cloudy with rain likely (70%) Tuesday, then mostly cloudy with a (40%) chance of showers Tuesday night.
- lows 38-43 cooling back to 38 Tuesday night highs near 48.
- Cloudy with a good (50%) chance of rain and a bit warmer Wednesday, mostly cloudy with a (30%) chance of rain Wednesday night,
- Cloudy and a bit warmer with a good (50%) chance of rain Thursday, showers likely (70%) at night,
- Mostly cloudy with a (30%) chance of showers and a bit warmer Friday, partly cloudy Friday night,
- Areas of AM fog, then partly cloudy and a bit cooler Saturday afternoon.
- highs 52-56 cooling to 54 Saturday lows near 40. (seasonal averages high 49 low 36)
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Forecast for The South Oregon Coast Including Coos Bay and North Bend:
- Mostly cloudy and a bit cooler tonight with areas of fog late tonight and Sunday AM, a slight (20%) chance of coastal rain while a slight (20%) chance of inland rain Sunday afternoon (under 0.10 in. of rain possible), a slight (20%) chance of coastal rain at night while a slight (20%) chance of evening inland rain,
- Mostly cloudy with a good (50%) chance of AM rain, rain likely (70%) Monday afternoon, evening rain, rain likely (70%) late Monday night,
- Cloudy with rain likely (70%) Tuesday, mostly cloudy with a good (50%) chance of showers Tuesday night.
- lows 40-43 cooling to 40 Tuesday night highs near 52.
- Cloudy and a bit warmer with a good (50%) chance of rain Wednesday, mostly cloudy with a (40%) chance of rain at night,
- Cloudy and a bit warmer with a good (50%) chance of rain Thursday, a good (50%) chance of showers Thursday night,
- Mostly cloudy with a (30%) chance of showers Friday, a slight (20%) chance of showers at night,
- Areas of AM fog, then just mostly cloudy Saturday.
- highs 54-57 lows near 42. (seasonal averages high 51 low 40)
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Forecast for the Cascades in Lane County:
- Partly cloudy tonight,
- Increasing clouds to mostly cloudy and a bit cooler with a slight (20%) chance of rain and snow Sunday afternoon, just mostly cloudy Sunday night,
- Mostly cloudy and a bit cooler with rain and snow likely (70%) Monday afternoon, rain likely (70%) at night and Tuesday AM, rain and snow showers likely (60%) and a bit cooler in the afternoon, good (50%) chance of rain and snow showers Tuesday night.
- free air freezing level 5,000 ft. rising to 8,000 ft. tonight, snow level 4,000 ft. Sunday, free air freezing level 9,000 ft. falling to 5,500 ft. Sunday night, snow level 6,000 ft. Monday afternoon, 7,000 ft. Monday night, 5,500 ft. Tuesday, then 3,500 ft. Tuesday night.
- lows 27-32 cooling to 26 Tuesday night highs 42-38.
- Mostly cloudy and a bit cooler with rain and snow likely (60%) Wednesday, a (40%) chance or rain and snow Wednesday night,
- Cloudy and a bit warmer with a rain and snow likely (70%) Thursday, showers likely (70%) at night,
- Mostly cloudy with a (40%) chance of showers Friday, a slight (20%) chance of rain and snow showers Friday night,
- Then just partly cloudy and a bit warmer Saturday.
- snow level 3,000 ft. Wednesday, 4,500 ft. Wednesday night, 5,000 ft. Thursday, 6,000 ft, Thursday night, 4,500 ft. Friday and Friday night, then free air freezing level 10,000 ft. Saturday.
- highs 37-42 lows near 30.
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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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