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 brought us another snow and ice storm as the warm air ahead of the front met the cold air already in place at the surface. The graphic for days 3-7 shows another series frontal systems that will be headed our way next week. 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 54 in the Moderate category measuring Particulate Matter.

Oakridge: The Air Quality Index is 87 in the Moderate category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 48 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:

• AN ICE STORM WARNING IS IN EFFECT UNTIL 10 PM TONIGHT FOR THE COAST RANGE OF NORTHWEST OREGON, THE GREATER PORTLAND METRO AREA.
• AN ICE STORM WARNING IS IN EFFECT UNTIL 4 PM TODAY FOR THE CENTRAL COAST RANGE OF WESTERN OREGON, THE SOUTH WILLAMETTE VALLEY, THE CASCADE FOOTHILLS IN LANE COUNTY.
• AN ICE STORM WARNING IS IN EFFECT UNTIL 6 PM TODAY FOR THE CENTRAL WILLAMETTE VALLEY, THE NORTHERN OREGON CASCADE FOOTHILLS, AND THE CASCADE FOOTHILLS IN LANE COUNTY.
• A WINTER STORM WARNING IS IN EFFECT UNTIL 6 AM MONDAY FOR THE WESTERN COLUMBIA RIVER GORGE, THE CENTRAL COLUMBIA RIVER GORGE, AND THE UPPER HOOD RIVER VALLEY.
• A HIGH WIND WARNING IS IN EFFECT UNTIL 4 PM THIS AFTERNOON FOR THE WESTERN COLUMBIA RIVER GORGE
• A WINTER WEATHER ADVISORY IS IN EFFECT UNTIL 6 PM TODAY FOR THE NORTH OREGON CASCADES.
• A FLOOD WATCH IS IN EFFECT THROUGH THIS EVENING FOR THE SOUTH CENTRAL OREGON COAST, THE CURRY COUNTY COAST, CENTRAL DOUGLAS COUNTY, EASTERN CURRY COUNTY, JOSEPHINE COUNTY, JACKSON COUNTY, THE SOUTHERN OREGON CASCADES, AND THE SISKIYOU MOUNTAINS.
• A WINTER STORM WATCH IS IN EFFECT FROM LATE TONIGHT THROUGH TUESDAY MORNING ABOVE 3,000 FT. FOR EASTERN CURRY COUNTY, THE EASTERN DOUGLAS COUNTY FOOTHILLS, THE SOUTH CENTRAL OREGON CASCADES, THE SOUTHERN OREGON CASCADES, AND THE SISKIYOU MOUNTAINS.
• A WIND ADVISORY IS IN EFFECT UNTIL 8 PM TONIGHT 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:

• Mostly cloudy with freezing rain slowly ending, rain and a bit warmer late this afternoon (0.25 in. of rain possible), rain tonight (0.25 in. of rain possible),
• Mostly cloudy with showers and a bit cooler Monday (0.25 in. of rain possible, small hail possible) and Monday night (0.25 in. of rain possible),
• Mostly cloudy with AM showers likely (70%), rain and a bit cooler Tuesday afternoon, then rain Tuesday night.
• highs 40-43 cooling back to 40 Tuesday lows near 36.
• Mostly cloudy with rain and a bit warmer Wednesday, cloudy with a good (50%) chance of showers at night,
• Mostly cloudy with a (40%) chance of showers Thursday, a slight (20%) chance of showers Thursday night,
• A mix of clouds and sun clouds and sun and a bit warmer Friday, mostly cloudy with a (30%) chance of rain at night,
• Then cloudy and a bit warmer with a good (50%) chance of rain Saturday.
• highs 42-44 lows 34-36. (seasonal averages high 46 low 34)

 

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Forecast for Roseburg:

• Rain and a bit warmer this afternoon (0.50 in. of rain possible) and tonight (0.25 in. of rain possible), snow level 3,000 ft. late tonight),
• Cloudy with rain and snow showers and a bit cooler Monday (2-3 in. of snow possible, snow level 2,500 ft.), evening rain and snow showers, rain late Monday night (snow level 2,500 ft. rising to 3,000 ft. late at night),
• Then mostly cloudy with rain Tuesday (snow level 3,000 ft. rising to 3,500 ft. in the afternoon) and Tuesday night.
• highs 48-44 lows 36-40.
• Mostly cloudy with rain and a bit warmer Wednesday, evening showers, rain and snow showers late Wednesday night,
• A (40%) chance of rain and snow showers and a bit cooler Thursday and Thursday night,
• Mostly cloudy and a bit warmer with a slight (20%) chance of rain and snow showers Friday, a (40%) of rain Friday night,
• Then cloudy with a (40%) chance of rain and a bit warmer Saturday.
• highs 47-45 warming to 50 Saturday lows 38-36 warming to 42 Friday night. (seasonal averages high 49 low 36)

 

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

• Rain and a bit warmer this afternoon (0.50 in. of rain possible), rain tonight (0.25 in. of rain possible),
• Mostly cloudy with coastal showers and a slight (20%) chance of thunderstorms while showers inland and  a bit cooler Monday and in the evening, rain late Monday night through Tuesday night.
• highs 54-49 lows 42-46.
• Rain and a bit cooler Wednesday, showers at night,
• Mostly cloudy with a (30%) chance of showers Thursday and Thursday night,
• Mostly cloudy with a slight (20%) chance of showers Friday, a (40%) chance of rain Friday night,
• Then cloudy and a bit warmer with a (40%) chance of rain and breezy Saturday.
• highs 50-53 lows 40-45. (seasonal averages high 51 low 40)

 

 

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Forecast for the Cascades in Lane County:

• Mostly cloudy with rain (0.50 in. of rain possible) and a bit warmer this afternoon, breezy (Wind: S 15-25 mph gusts to 35 mph, evening rain, rain and snow late tonight (0.50 in. of rain possible, 1-4 in. of snow possible),
• Mostly cloudy with snow showers and a bit cooler Monday through Tuesday AM, snow in the afternoon, then rain and snow Tuesday night.
• snow level 6,500 ft. today, 6,000 ft. falling to 4,000 ft. late tonight, 2,500 ft. Monday through Tuesday, then 4,000 ft. Tuesday night.
• highs 32-28 warming back to 32 Tuesday lows 24-26.
• Mostly cloudy and a bit cooler with rain and snow Wednesday, snow showers Wednesday night,
• Mostly cloudy and a bit warmer with a good (50%) chance of snow showers Thursday, partly cloudy with a slight (20%) chance of snow showers  Thursday night,
• Just partly cloudy and a bit warmer Friday, mostly cloudy with a (40%) chance of rain and snow Friday night.
• Then mostly cloudy with a good (50%) chance of rain and snow Saturday.
• snow level 3,000 ft. Wednesday, 2,500 ft. Wednesday night, at the surface Thursday and Thursday night, free air freeing level at the surface Friday, snow level 3,500 ft. Friday night, then 4,000 ft. Saturday.
• highs 32-28 warming back to 32 Saturday lows 22-19 warming back to 22 Friday night.

 

 

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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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