Here is my weekly weather quiz question for the last time. What is an“Adiabatic Lapse Rate?” Here is the correct answer. An Adiabatic Lapse Rate is the rate of decrease of temperature experienced by a parcel of air when it is lifted in the atmosphere under the restriction that it cannot exchange heat with its environment. For parcels that remain unsaturated during lifting, the (dry adiabatic) lapse rate is 9.8°C per kilometer. I’ll have a new weekly weather quiz question for yopu 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 (Shaded “Arch” shape with blue arrows) to our Northwest is still sending cold air down to us from Canada. The days 1-3 graphic shows  surface low and frontal system headed our way for another snow and ice storm on today as the warm air ahead of the front meets the cold air already in place at the surface. The graphic for days 3-7 shows another frontal system that will be headed our way next Wednesday. For mountain snow conditions at the local ski areas check out their websites or give them a call.

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Air Quality Index:

Eugene-Springfield: The Air Quality Index is 60 in the Moderate category measuring Particulate Matter.

Oakridge: The Air Quality Index is 63 in the Moderate category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 56 in the Moderate 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 WINTER WEATHER ADVISORY IS IN EFFECT UNTIL 6 PM TODAY FOR THE NORTH OREGON COAST AND THE NORTH OREGON CASCADES.
• A WINTER STORM WARNING IS IN EFFECT UNTIL 10 PM SUNDAY FOR THE COAST RANGE OF NORTHWEST OREGON.
• A WINTER STORM WARNING IS IN EFFECT UNTIL 6 AM SUNDAY FOR THE CENTRAL COAST RANGE OF WESTERN OREGON, THE SOUTH WILLAMETTE VALLEY, THE CASCADE FOOTHILLS IN LANE COUNTY.
• A WINTER WEATHER ADVISORY IS IN EFFECT UNTIL NOON SUNDAY FOR THE LOWER COLUMBIA.
• A WINTER STORM WARNING IS IN EFFECT UNTIL 10 PM SUNDAY FOR THE GREATER PORTLAND METRO AREA.
• A WINTER STORM WARNING IS IN EFFECT UNTIL 4 PM SUNDAY FOR THE CENTRAL WILLAMETTE VALLEY.
• A WINTER STORM WARNING IS IN EFFECT UNTIL 10 AM SUNDAY FOR THE NORTHERN OREGON CASCADE FOOTHILLS.
• A WINTER STORM WARNING IS IN EFFECT UNTIL 6 AM MONDAY FOR WESTERN COLUMBIA RIVER GORGE, THE CENTRAL COLUMBIA RIVER GORGE, AND THE UPPER HOOD RIVER VALLEY.
• A WINTER STORM WARNING IS IN EFFECT UNTIL 6 AM SUNDAY NIGHT FOR THE CASCADE FOOTHILLS IN LANE COUNTY.
• A WINTER WEATHER ADVISORY IS IN EFFECT UNTIL 6 PM SUNDAY FOR THE NORTH OREGON CASCADES.
• A WINTER WEATHER ADVISORY IS IN EFFECT UNTIL 10 AM SUNDAY FOR THE CASCADES IN LANE COUNTY.
• A FLOOD WATCH IS IN EFFECT FROM THIS EVENING THROUGH SUNDAY EVENING FOR THE SOUTH CENTRAL OREGON COAST, THE CURRY COUNTY COAST, EASTERN CURRY COUNTY, JOSEPHINE COUNTY, JACKSON COUNTY, THE SOUTHERN OREGON CASCADES, AND THE SISKIYOU MOUNTAINS.
• A WINTER STORM WARNING IS IN EFFECT UNTIL NOON TODAY FOR EASTERN CURRY COUNTY, JOSEPHINE COUNTY, AND JACKSON COUNTY.
• A WINTER WEATHER ADVISORY IS IN EFFECT 4 PM TODAY FOR THE EASTERN DOUGLAS COUNTY FOOTHILLS, THE SOUTH CENTRAL OREGON CASCADES, THE SOUTHERN OREGON CASCADES, THE SISKIYOU MOUNTAINS,
• A WINTER STORM WARNING IS IN EFFECT UNTIL 10 PM TONIGHT FOR THE KLAMATH BASIN.
• A WINTER STORM WARNING IS IN EFFECT UNTIL 4 AM SUNDAY FOR NORTHERN AND EASTERN KLAMATH COUNTY, AND CENTRAL, EASTERN, AND WESTERN LAKE COUNTY.
• 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:

• Cloudy and cooler with freezing rain, snow and sleet today, freezing rain late this afternoon and evening (0.50 in. of rain possible, 1-3 in. of snow possible, 0.50 in. of ice accumulation possible), freezing rain late tonight (0.25 in. of rain possible, 0.25 in. of ice accumulation possible),
• Mostly cloudy with rain and a (30%) chance of freezing rain in the AM, rain and a bit warmer Sunday afternoon (0.50 in. of rain possible, 0.10 in. of ice accumulation possible), rain at night (0.25 in. of rain possible),
• Mostly cloudy with rain and a bit warmer Monday, then rain likely (70%) Monday night.
• highs 33-44 lows 33-36.
• Mostly cloudy with rain and a bit cooler Tuesday, rain likely (70%) Tuesday night and Wednesday (a bit warmer), cloudy with a good (50%) chance of rain at night,
• Cloudy with a good (50%) chance of rain and snow showers and a bit cooler Thursday (snow level 1,000 ft.), a good (50%) chance of rain and snow showers Thursday night (snow level 1,000 ft.),
• Then mostly cloudy with a good (50%) chance of rain Friday.
• highs near 42 lows 38-32. (seasonal averages high 46 low 34)

 

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Forecast for Roseburg:

• Mostly cloudy with rain with a (40%) chance of light freezing rain and a bit warmer this afternoon (0.50 in. of rain possible, under 0.25 in. of ice accumulation possible), then rain tonight (0.25 in. of rain possible) through Sunday night (0.50 in. of rain possible Sunday and 0.25 in. of rain possible Sunday night, snow level 3,500 ft. late Sunday night),
• Cloudy with rain and snow (snow possibly heavy at times) and a bit cooler Monday, then rain and snow Monday night.
• highs 43-48 cooling back to 43 Monday lows 40-36.
• Mostly cloudy and a bit warmer with rain Tuesday and at night,
• Mostly cloudy with rain and a bit cooler Wednesday, rain likely (70%) Wednesday night,
• Rain and snow in the AM, rain and a bit cooler Thursday afternoon, evening rain likely (70%), rain and snow likely (70%) late Thursday night,
• Then mostly cloudy with a (30%) chance of rain and snow Friday.
• highs near 46 lows 40-33. (seasonal averages high 49 low 36)

 

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

• Mostly cloudy with coastal rain today while inland rain and a bit warmer this afternoon (0.50 in. of rain possible), rain tonight (0.50 in. of rain possible), Sunday (a bit warmer, 0.50 in. of rain possible), and Sunday night (a bit cooler, 0.25 in. of rain possible),
• Mostly cloudy with rain, a bit cooler and breezy Monday, then rain, heavy at times, and breezy Monday night.
• highs 50-54 cooling back to 50 Monday lows 45-42.
• Mostly cloudy and a bit warmer with rain, heavy at times, and breezy Tuesday and Tuesday night,
• Rain and a bit cooler Wednesday through Thursday night,
• Then mostly cloudy with a (30%) chance of rain Friday.
• highs 52-48 warming back to 52 Friday lows 44-39. (seasonal averages high 51 low 40)

 

 

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Forecast for the Cascades in Lane County:

• Cloudy with snow, freezing rain and sleet early this afternoon, rain and snow later this afternoon (0.50 in. of rain possible, 3-6 in. of snow possible, under 0.25 in. of ice accumulation possible, freezing rain in the mountain valleys), rain and a bit warmer tonight (0.75 in. of rain possible),
• Mostly cloudy with rain (0.75 in. of rain possible) and a bit warmer Sunday, evening rain, rain and snow late at night,
• Then mostly cloudy with snow and a bit cooler Monday and in the evening, snow showers late Monday night.
• highs 22-34 lows 19-27.
• snow level 4,500 ft. this afternoon, 6,000 ft. tonight, 6,500 ft. Sunday, 5,500 ft. Sunday night, then 2,500 ft. Monday and Monday night.
• Mostly cloudy with rain and snow and a bit cooler Tuesday and at night,
• Snow and a bit cooler Wednesday, snow likely (70%)Wednesday night,
• Cloudy and a bit cooler with a good (50%) chance of snow Thursday and Thursday night,
• Then mostly cloudy with a good (50%) chance of snow and a bit warmer Friday.
• snow level 3,000 ft. Tuesday, 4,000 ft. Tuesday night, 2,500 ft. Wednesday, at the surface Wednesday night and Thursday, 3,000 ft. Thursday night, then at the surface Friday.
• highs 32-28 warming to 30 Friday lows 24-20.

 

 

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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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