Here is my new weekly weather quiz question. What is an“Adiabatic Lapse Rate?” 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) is sending cold air down to us from Canada. A surface low adds just enough moisture for a touch of rain mixed with snow. The days 1-3 graphic shows the next surface low and frontal system that will move Southward through along the Pacific Coast by Wednesday. There will be some precipitation, but so far there shouldn’t be enough moisture to bring any more than just a light snow/rain mix for the South Willamette Valley. The graphic for days 3-7 shows more frontal systems that will be headed our way Friday into Saturday and Sunday into Monday.  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 25 in the Good category measuring Particulate Matter.

Oakridge: The Air Quality Index is 25 in the Good category measuring Particulate Matter.

Cottage Grove: The Air Quality Index is 8 in the Good category measuring Particulate Matter.

Data courtesy of Lane Regional Air Protection Agency (LRAPA)

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Home Wood Heating Advisory:

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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Advisories:

• A WINTER WEATHER ADVISORY IS IN EFFECT UNTIL 7 PM THIS EVENING FOR CENTRAL DOUGLAS COUNTY, THE SOUTHERN OREGON CASCADES AND THE SISKIYOU MOUNTAINS.
• A WINTER STORM WARNING IS IN EFFECT  THROUGH 4 AM WEDNESDAY ABOVE 2,000 FT. FOR EASTERN CURRY COUNTY AND  JOSEPHINE COUNTY.
• A WINTER STORM WARNING IS IN EFFECT FROM 10 AM TUESDAY UNTIL 10 AM WEDNESDAY FOR THE SOUTH CENTRAL OREGON CASCADES, THE SISKIYOU MOUNTAINS, THE KLAMATH BASIN, NORTHERN AND EASTERN KLAMATH COUNTY, AND CENTRAL, EASTERN AND WESTERN LAKE COUNTY.
• A WINTER WEATHER ADVISORY IS IN EFFECT UNTIL 7 PM THIS EVENING BELOW 2,000 FT. FOR EASTERN CURRY COUNTY AND JOSEPHINE COUNTY.
• A WINTER WEATHER ADVISORY IS IN EFFECT UNTIL 7 PM THIS EVENING  FOR THE SOUTHERN OREGON CASCADES  AND THE SISKIYOU MOUNTAINS.
• 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 a slight (20%) chance of snow showers this evening, a slight (20%) chance of snow showers late tonight,
• Mostly cloudy Tuesday AM, mostly sunny and a bit cooler in the afternoon, partly cloudy with a slight (20%) chance of evening snow, mostly cloudy and cold with a slight (20%) chance of snow Tuesday night,
• Cloudy and a bit cooler with a good (50%) chance of snow Wednesday, mostly cloudy with a slight (20%) chance of evening snow, a slight (20%) chance of snow showers late Wednesday night,
• Then mostly cloudy Thursday and at night.
• lows 25-28 cooling back to 22 Thursday night highs near 34.
• A mix of clouds and sun and a bit warmer Friday, partly cloudy Friday night,
• Becoming mostly cloudy with rain likely (70%) and a good (50%) chance of freezing rain and a bit warmer Saturday, rain and freezing rain likely (70%) Saturday night, then rain likely (70%) and a bit warmer Sunday through Monday.
• highs 37-43 lows 27-38. (seasonal averages high 46 low 34)

 

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Forecast for Roseburg:

• Mostly cloudy with a good (50%) chance of rain and snow showers tonight (under 0.10 in. of rain possible, snow level 400 ft.),
• Mostly cloudy with a (30%) chance of AM rain and snow showers, a (30%) chance of rain and snow showers and a bit cooler Tuesday afternoon (under 0.10 in. of rain possible, snow level 100 ft. rising to 1,000 ft. in the afternoon), a (30%) chance of evening rain and snow, rain with snow likely (70%) and a slight (20%) chance of freezing rain late Tuesday night (under 0.10 in. of rain possible, 2-3 in. of snow possible above 1,500 ft. and 1 in. of snow possible lower elevations, snow level 500 ft.),
• Mostly cloudy with rain, snow likely (70%) and a slight (20%) chance of light freezing rain Wednesday AM, rain and snow likely (70%) and a bit warmer in the afternoon (snow level 1,000 ft. rising to 2,000 ft. in the afternoon), a (40%) chance of evening rain and snow, a (40%) chance of rain and snow showers late Wednesday night (snow level 900 ft.),
• Then mostly cloudy with a slight (20%) chance of rain and snow showers and a bit cooler Thursday and Thursday night.
• lows 27-30 cooling to 25 Thursday night highs 39-42 cooling to 38 Thursday.
• Just mostly cloudy and a bit warmer Friday, a (30%) chance of rain and snow at night,
• Mostly cloudy with rain and snow likely (70%) and a bit warmer Saturday, rain and snow Saturday night,
• Then rain likely (70%) Sunday through Monday.
• highs 39-45 lows 30-39. (seasonal averages high 48 low 36)

 

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

• Mostly cloudy with evening coastal showers likely (70%) and a good (50%) chance of rain and snow showers late tonight while a good (50%) chance of inland rain and snow showers and a bit cooler tonight (0.10 in. of rain possible, snow level 700 ft.),
• Mostly cloudy with a (30%) chance of AM rain and snow showers, coastal rain and a bit warmer Tuesday afternoon while with a (30%) chance of inland rain and snow (snow level 500 ft. rising to 1,000 ft.), a (30%) chance of evening coastal rain and a good (50%) chance of rain and a slight (20%) chance of freezing rain late inland late Tuesday night (0.10 in. of rain possible, 1 in. of snow possible, snow level 800 ft.),
• Mostly cloudy with AM coastal rain likely (70%) and a good (50%) chance of rain Wednesday afternoon while  inland AM rain and snow likely (70%) with inland rain likely (70%) Wednesday afternoon (snow level 1,500 ft.), a (30%) chance of evening coastal rain and a (40%) chance of showers late at night while a (40%) chance of inland rain and snow showers late Wednesday night,
• Mostly cloudy and a bit cooler with a slight (20%) chance of rain and snow showers Thursday, then a slight (20%) chance of showers Thursday night.
• lows 32-34 cooling to 30 Thursday night highs 44-42.
• Just mostly cloudy and a bit warmer Friday, a (40%) chance of rain Friday night,
• Mostly cloudy with rain likely (70%) and a bit warmer Saturday, rain Saturday night and Sunday, rain likely (70%) Sunday night,
• Then mostly cloudy with rain Monday.
• highs 45-50 lows 35-42. (seasonal averages high 51 low 40)

 

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Forecast for the Cascades in Lane County:

• Mostly cloudy with a good (50%) chance of snow showers tonight,
• A mix of clouds and sun with a (30%) chance of AM snow showers, a bit cooler with a slight (20%) chance of snow showers Tuesday afternoon, mostly cloudy with a good (50%) chance of evening snow, breezy (Wind: E 15-25 mph gusts to 40 mph) and cold with snow likely (70%) late Tuesday night (1-4 in. of snow possible),
• Mostly cloudy Wednesday with snow likely (70%) a bit warmer and breezy (Wind: E 15-25 mph gusts to 40 mph decreasing and shifting to SE 5-10 mph in the afternoon), a (40%) chance of evening snow, a (40%) chance of snow showers and cold late Wednesday night,
• Mostly cloudy and a bit cooler with a slight (20%) chance of snow showers Thursday, then just mostly cloudy at night.
• snow level at the surface today through Thursday, then free air freezing level at the surface Thursday night.
• lows 10-15 cooling back to 10 Thursday night highs 22-25 cooling back to 22 Thursday.
• A mix of clouds and sun and a bit warmer Friday, partly cloudy at night,
• Becoming mostly cloudy with snow likely (70%) and a bit warmer Saturday, then rain and snow likely (70%) and a bit warmer Saturday night through Monday.
• highs 25-32 lows 17-27 cooling to 25 Sunday 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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