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.

________________

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.

________________

 

Air Quality Index:

Eugene-Springfield: The Air Quality Index is 77 in the Moderate category measuring Particulate Matter.

Oakridge: The Air Quality Index is 86 in the Moderate category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 66 in the Moderate category measuring Particulate Matter.

Data courtesy of Lane Regional Air Protection Agency (LRAPA)

________________

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)

________________

Advisories:

• AN ICE STORM WARNING IS IN EFFECT UNTIL 10 PM TONIGHT FOR THE COAST RANGE OF THE NORTH OREGON CASCADES AND THE GREATER PORTLAND METRO AREA.
• AN ICE STORM WARNING IS IN EFFECT UNTIL 6 PM TODAY FOR THE NORTHERN OREGON CASCADE FOOTHILLS.
• 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 FLOOD WATCH IS IN EFFECT UNTIL 10 PM TONIGHT 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 WARNING IS IN EFFECT FROM 7 AM MONDAY UNTIL 4 AM TUESDAY 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.

________________

 

Forecast for the Southern and lower Mid Willamette Valley including Eugene-Springfield and Albany-Corvallis:

• Mostly cloudy with rain tonight (0.25 in. of rain possible),
• Mostly cloudy with showers and a bit warmer Monday (0.25 in. of rain possible, small hail possible) and Monday night (0.25 in. of rain possible, small hail possible),
• Mostly cloudy with AM showers likely (70%), rain and a bit cooler Tuesday afternoon (0.25 in. of rain possible, small hail possible) and at night (0.25 in. of rain possible, small hail possible),
• Mostly cloudy with rain likely (70%) and a bit cooler Wednesday, then cloudy with a good (50%) chance of showers at night.
• lows 36-29 highs 42-39.
• A mix of clouds and sun with a slight (20%) chance of showers Thursday, just mostly cloudy Thursday night,
• A mix of clouds and sun clouds and sun Friday, becoming mostly cloudy with a (30%) chance of rain at night,
• Then cloudy and a bit warmer with a good (50%) chance of rain Saturday and Sunday, mostly cloudy with a good (50%) chance of rain Saturday night.
• highs 39-45 lows 28-37. (seasonal averages high 46 low 34)

 

_____________________

Forecast for Roseburg:

• Cloudy with rain and a bit warmer with patchy fog tonight (0.50 in. of rain possible), snow level 3,500 ft. late tonight),
• Patchy AM fog,  rain and snow showers and a bit cooler Monday afternoon (0.25 in. of rain possible, 2-4 in. of snow possible, snow level 2,500 ft.), evening rain and snow showers (snow showers possibly heavy at times), rain late Monday night (0.50 in. of rain possible, snow level 2,500 ft. rising to 3,000 ft. late at night),
• Mostly cloudy and a bit warmer with rain Tuesday (0.50 in. of rain possible, snow level 3,000 ft.), evening rain, rain and snow late Tuesday night (0.25 in. of rain possible, snow level 3,500 ft. falling to 2,500 ft. late at night),
• Mostly cloudy with AM rain and snow, rain and snow showers Wednesday afternoon, evening showers, then a good (50%) chance of rain and snow showers late Wednesday night.
• lows 37-40 cooling to 34 Wednesday night highs near 45.
• Mostly cloudy with a (40%) chance of rain and snow showers and a bit cooler Thursday, just mostly cloudy Thursday night,
• Partly cloudy and a bit warmer with a slight (20%) chance of rain and snow Friday, mostly cloudy with a (40%) of evening rain and snow, then mostly cloudy with a good (50%) chance of rain late Friday night through Sunday,
• highs 43-49 lows 32-38. (seasonal averages high 49 low 36)

 

________________

 

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

• Coastal rain this evening, coastal showers and a bit warmer with a slight (20%) chance of thunderstorms late tonight while inland 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 (0.50 in. of rain possible, small hail possible) and in the evening while inland evening showers and inland rain late Monday night (0.50 in. of rain possible),
• Rain and a bit warmer Tuesday (0.50 in. of rain possible) through Wednesday AM, showers one  bit cooler in the afternoon, evening showers likely (70%), then rain and snow showers and colder Wednesday night.
• lows 42-37 highs 48-52 cooling back to 48 Wednesday.
• Mostly cloudy with a (30%) chance of AM rain and snow showers, a slight (20%) chance of showers  Thursday afternoon, just mostly cloudy Thursday night,
• Partly cloudy and a bit warmer with a slight (20%) chance of rain Friday, mostly cloudy with a (40%) chance of rain Friday night and Saturday (a bit warmer), then rain likely (70%) Saturday night and Sunday.
• highs 50-53 lows 35-42. (seasonal averages high 51 low 40)

 

 

________________

 

Forecast for the Cascades in Lane County:

• Mostly cloudy with rain this evening, rain or snow late tonight (0.50 in. of rain possible, 3 in. of snow possible),
• Mostly cloudy with snow showers and a bit cooler Monday (2-5 in. of snow possible) and Monday night (3-6 in. of snow possible),
• Showers Tuesday AM, rain or snow in the afternoon and at night,
• Mostly cloudy with snow and a bit cooler Wednesday, then cloudy with snow showers likely (70%) Wednesday night.
• snow level 6,000 ft. falling to 4,000 ft. late tonight, 2,500 ft. Monday through Tuesday, 4,000 ft. Tuesday night, 3,000 ft. Wednesday, then 2,500 ft. Wednesday night.
• lows 24-26 cooling to 15 Wednesday night highs 30-27 warming back to 32 Tuesday.
• A mix of clouds and sun and a bit cooler with a (40%) chance of snow showers Thursday, partly cloudy Thursday night,
• A mix of clouds and sun and a bit warmer Friday, cloudy with a (40%) chance of rain and snow Friday night,
• Then mostly cloudy with a good (50%) chance of rain and snow and a bit warmer Saturday, a (40%) chance of rain or snow at night,
• Then cloudy with a good (50%) chance of rain and snow showers Sunday.
• snow level at the surface Thursday, free air freezing level at the surface Thursday night and Friday, snow level 2,500 ft. Friday night, 4,500 ft. Saturday, then 5,000 ft. Saturday night and Sunday.
• highs 23-34 lows 14-23.

 

 

________________

 

**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.

________________