Here is my weekly weather quiz question. What is an “Inversion? Here is the correct answer. Inversion(abbrev. INVRN) Is generally, a departure from the usual increase or decrease in an atmospheric property with altitude. Specifically it almost always refers to a temperature inversion, i.e., an increase in temperature with height, or to the layer within which such an increase occurs. An inversion is present in the lower part of a cap.
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An Upper Level Low Pressure Trough (“U “shape) is slowly moving southward over the Pacific Northwest. The graphics for days 1-3 show a slight pause in the frontal activity. The graphics for days 3-7 show more complex frontal activity moving our way Tuesday through next Saturday giving us chances of getting wet.
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Air Quality Index:
Eugene/Springfield: The Air Quality Index is 27 in the Good category measuring Particulate Matter.
Oakridge: The Air Quality Index is 70 in the Moderate category measuring Particulate Matter.
Cottage Grove: The Air Quality Index is 46 in the Good category measuring Particulate Matter.
Data courtesy of Lane Regional Air Protection Agency (LRAPA)
NOTE: Outdoor burning remains temporarily prohibited for the following areas: Eugene-Springfield (Always), Florence (Always), Lowell, Oakridge and UGB, and Springfield and UGB.
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ADVISORIES:
- A WINTER WEATHER ADVISORY IS IN EFFECT FROM MIDNIGHT TONIGHT UNTIL 6 PM SUNDAY FOR THE NORTHERN OREGON CASCADE FOOTHILLS, THE NORTHERN OREGON CASCADES, AND THE CASCADES IN LANE COUNTY.
- A WINTER WEATHER ADVISORY IS IN EFFECT FROM MIDNIGHT TONIGHT UNTIL 6 PM SUNDAY FOR THE NORTHERN OREGON CASCADES AND THE CASCADES IN LANE COUNTY.
- A WINTER WEATHER ADVISORY IS IN EFFECT FROM 10 PM TONIGHT UNTIL NOON SUNDAY FOR AREAS ABOVE 1,000 FT. FOR THE CENTRAL COAST RANGE OF WESTERN OREGON.
- A WINTER WEATHER ADVISORY IS IN EFFECT FROM MIDNIGHT TONIGHT UNTIL NOON SUNDAY ABOVE ABOVE 1,500 FT. FOR THE CASCADE FOOTHILLS IN LANE COUNTY.
- A WINTER WEATHER ADVISORY IS IN EFFECT FROM 10 PM TONIGHT UNTIL 10 PM SUNDAY FOR THE EAST SLOPES OF THE OREGON CASCADES.
- A WINTER WEATHER ADVISORY IS IN EFFECT FROM LATE THIS EVENING THROUGH SUNDAY MORNING FOR THE WESTERN COLUMBIA RIVER GORGE.
- A WINTER STORM WATCH IS IN EFFECT FROM LATE TONIGHT THROUGH SUNDAY MORNING FOR THE UPPER HOOD RIVER VALLEY AND THE CENTRAL COLUMBIA RIVER GORGE.
- A WINTER STORM WATCH IS IN EFFECT FROM LATE THIS EVENING THROUGH SUNDAY MORNING FOR THE NORTHERN OREGON CASCADE FOOTHILLS.
- A WINTER STORM WATCH IS IN EFFECT FROM LATE TONIGHT THROUGH SUNDAY AFTERNOON FOR THE SOUTH CENTRAL OREGON CASCADES, THE SISKIYOU MOUNTAINS, AND THE SOUTHERN OREGON CASCADES.
- A FREEZE WARNING IS IN EFFECT FROM 1 AM UNTIL 9 AM TODAY FOR THE SOUTH CENTRAL OREGON COAST AND THE CURRY COUNTY COAST.
- A WINTER STORM WATCH IS IN EFFECT FROM LATE TONIGHT THROUGH SUNDAY AFTERNOON ABOVE 2,500 FT. FOR CENTRAL DOUGLAS COUNTY, EASTERN CURRY COUNTY AND JOSEPHINE COUNTY, AND JACKSON COUNTY.
HEALTH 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:
- Mostly sunny start, becoming partly cloudy and a bit warmer this afternoon, cloudy this evening, rain late tonight (0.25 in. of rain possible, under 1 in. of snow possible, snow level 500 ft.),
- Mostly cloudy with showers Sunday (0.25 in. of rain possible, 1 in., of snow possible, snow level 1,000 ft.), evening showers likely (70%), snow likely (70%) rain or snow late Sunday night (under 0.10 in. of rain possible1 in. of snow possible, snow level 1,000 ft.),
- Mostly cloudy with rain Monday rain at night (snow level 1,000 ft.).
- highs near 45 lows near 32.
- Mostly cloudy with rain and a bit cooler Tuesday (snow level 1,000 ft.), just partly cloudy Tuesday night,
- A mix of clouds and sun and a bit warmer with a (30%) chance of showers Wednesday, mostly cloudy with a good (50%) chance of rain at night,
- Mostly cloudy with rain Thursday, rain Thursday night (snow level 1,000 ft.),
- Then rain or snow likely (70%) Friday (snow level 1,000 ft.).
- highs 42-45 lows 26-32 (seasonal averages high 53 low 35)
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Home Wood Heating Advisory:
Posted Daily
Eugene-Springfield: GREEN– Burning is Allowed.
Oakridge: GREEN– Burning is Allowed.
*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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Forecast for the Umpqua Valley including Roseburg:
- Sunny and a bit warmer today, partly cloudy with evening rain and snow, cloudy with rain and snow late tonight (0.10 in. of rain possible, 1-2 in. of snow possible, snow level 1,500 ft.),
- Mostly cloudy with rain and snow and a bit cooler Sunday (0.25 in. of rain possible snow level 1,500 ft.), a good (50%) chance of evening rain and snow, snow showers late Sunday night (under 0.10 in. of rain possible, snow level 600 ft.),
- Mostly cloudy with showers, snow showers and a bit warmer with a slight (20%) chance of thunderstorms Monday afternoon, then rain and snow showers Monday night.
- highs 49-44 lows 35-32.
- Mostly cloudy and a bit cooler with rain and snow showers Tuesday, evening rain and snow showers likely (70), a slight (20%) chance of rain and snow showers late Tuesday night,
- Mostly cloudy with a slight (20%) chance of AM rain and snow showers, partly cloudy and a bit warmer with a slight (20%) chance of rain and snow showers Wednesday afternoon, a (0%) chance of rain and snow showers Wednesday night,
- Mostly cloudy with a (0%) chance of AM rain and snow showers, rain and snow showers likely (70%) Thursday afternoon and Thursday night,
- Then mostly cloudy with rain and snow showers likely (70%) Friday.
- highs 43-45 lows 30-28 warming to 34 Thursday night. (seasonal averages high 56 low 38)
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Forecast for The South Oregon Coast Including Coos Bay and North Bend:
- AM widespread frost, sunny and slightly warmer with a slight (20%) chance of rain this afternoon, mostly cloudy with coastal rain tonight while mostly cloudy with areas of evening inland frost, while partly cloudy with evening areas of inland frost and rain and snow rain and a slight (20%) chance of snow and cloudy with inland rain and snow late tonight (0.25 in. of rain possible, snow level 1,500 ft. rising to 2,000 ft. late at night),
- Mostly cloudy with AM coastal rain and coastal rain likely (70%) Sunday afternoon while inland rain and snow Sunday (0.25 in. of rain possible, snow possibly heavy at times), evening coastal rain likely (70%) with coastal snow and a slight (20%) chance of thunderstorms rain late Sunday night while inland evening rain and snow showers with inland rain and snow showers late at night (0.25 in. of rain possible, snow level 900 ft., snow possibly heavy at times late at night),
- Mostly cloudy with rain and snow showers (snow possibly heavy at times) Monday, then rain and snow showers Monday night.
- highs near 48 lows near 34.
- Mostly cloudy with rain and snow showers and a bit cooler Tuesday, evening rain and snow showers likely (70%), a good (50%) chance of rain and snow showers Tuesday night,
- Partly cloudy with a slight (20%) chance of AM rain and snow showers, a slight (20%) chance of showers and a bit warmer Wednesday afternoon, a (30%) chance of rain and snow showers Wednesday night,
- Mostly cloudy with showers likely (70%) Thursday and in the evening, rain and snow showers likely (70%) late Thursday night,
- Then mostly cloudy and a bit cooler with rain and snow showers likely (70%) Friday.
- highs 49-47 lows 29-34. (seasonal averages high 54 low 41)
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Forecast for the Northern Oregon Cascades including the Cascades in Lane County:
- Mostly sunny start, becoming partly cloudy and a bit cooler this afternoon, increasing clouds to cloudy with evening rain or snow likely (70%), snow late tonight (2-6 in. of snow possible, snow possibly heavy at times,)
- Mostly cloudy with snow and cooler Sunday (6-10 in. of snow possible, snow possibly heavy at times in AM), a good (50%) chance of evening snow, rain and snow late at night (2-4 in. of snow possible),
- Mostly cloudy and a bit warmer with rain and snow Monday (3-6 in. of snow possible), evening snow, then snow late Monday night.
- free air freezing level at the surface tonight, 3,000 ft. Saturday afternoon, snow level 1,500 ft. Saturday night, then 1,500 ft. Sunday through Monday night.
- highs 43-26 lows 22-17.
- Mostly cloudy with rain and snow and a bit cooler Tuesday, mostly cloudy with a slight (20%) chance of snow showers Tuesday night,
- A mix of clouds and sun and a bit warmer with a good (50%) chance of snow showers Wednesday, rain and snow likely (70%) late at night,
- Mostly cloudy and a bit warmer with rain and snow Thursday and Thursday night,
- Then mostly cloudy and a bit cooler with rain and snow Friday.
- snow level 1,500 ft. Tuesday, at the surface Tuesday night, 1,500 ft. Wednesday and Wednesday night, 2,000 ft. Thursday and Thursday night, then 1,500 ft. Friday.
- highs 26-32 cooling to 27 Friday lows 13-20.
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For all of your Eugene-Springfield and Lane County News, Weather, and Sports go to: EugeneDailyNews.com
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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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