Here is my weekly weather quiz question. What is  “Anomalous Propagation?” Please remember to post your answer at the bottom of this page. 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 Low Pressure Trough (Shaded “U” shape with blue arrows) has changed our weather and toward the end of the workweek we’ll get colder on the backside of that low (the leading edge of approaching high pressure) with colder Northwesterly airflow. The graphic for days 1-3 shows the frontal system moving into the Pacific Northwest. The graphic for days 3-7 shows no particular surface fronts for the week until next Sunday into Monday as another system move in through Northern California. 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 10 in the Good category measuring Particulate Matter.

Oakridge: The Air Quality Index is 16 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 FLOOD WARNING REMAINS IN EFFECT FOR THE COQUILLE RIVER AT COQUILLE, THE TUALATIN RIVER AT FARMINGTON AND THE PUDDING RVER AT AURORA.
• A WINTER WEATHER ADVISORY IS IN EFFECT UNTIL 10 PM TONIGHT ABOVE 1,500 FT. FOR THE SOUTH CENTRAL OREGON COAST AND THE CURRY COUNTY COAST.
• A WINTER WEATHER ADVISORY IS IN EFFECT FROM FRIDAY MORNING THROUGH SATURDAY  MORNING FOR THE SOUTH CENTRAL OREGON COAST AND THE CURRY COUNTY COAST.
• A WINTER WEATHER ADVISORY IS IN EFFECT UNTIL 4 AM THURSDAY FOR CENTRAL DOUGLAS COUNTY, EASTERN CURRY COUNTY, JOSEPHINE COUNTY, AND JACKSON COUNTY.
• A WINTER WEATHER ADVISORY IS IN EFFECT UNTIL 10 PM TONIGHT FOR THE EASTERN DOUGLAS COUNTY FOOTHILLS, THE SOUTH CENTRAL OREGON CASCADES, THE SOUTHERN OREGON CASCADES AND THE SISKIYOU MOUNTAINS.
• A WINTER STORM WATCH IS IN EFFECT FROM FRIDAY MORNING THROUGH SATURDAY MORNING FOR THE SOUTH CENTRAL OREGON COAST, THE CURRY COUNTY COAST, EASTERN CURRY COUNTY, JOSEPHINE COUNTY, THE EASTERN DOUGLAS COUNTY FOOTHILLS, JACKSON COUNTY, 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 evening showers likely (70%) and small hail possible, a slight (20%) chance of rain and snow showers late tonight with patchy fog (under 0.10 in. of rain possible, no accumulation expected, snow level 1,000 ft.),
• Mostly cloudy with areas of AM fog, mostly cloudy with a good (50%) chance of rain and snow showers and a bit cooler Thursday afternoon (0.10 in. of rain possible) and a good (50%) chance of rain and snow showers late at night (under 0.10 in. of rain possible),
• Cloudy with a good (50%) chance of AM rain and snow showers, rain and snow showers likely (70%) and a bit cooler Friday afternoon (0.10 in. of rain possible) and evening, a (40%) chance of rain and snow showers late at night (0.10 in. of rain possible, snow level 1,000 ft.),
• 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 Saturday afternoon (snow level 1,000 ft.), a slight (20%) chance of showers in the evening, mostly cloudy with a slight (20%) chance of rain and snow showers late at night (snow level 1,000 ft. late at night).
• lows near 32 highs 46-40 warming to 47 Saturday.
• Mostly cloudy and a bit cooler with rain and snow showers likely (70%) Sunday (snow level 1,500 ft.), a (40%) chance of rain and snow showers Sunday night,
• A (40%) chance of rain and snow showers and a bit warmer Monday and at night,
• A bit warmer good (50%) chance of showers Tuesday, a (40%) chance of showers Tuesday night,
• Then mostly cloudy with a (30%) chance of showers and a bit warmer Wednesday.
• highs 45-49 lows 32-36. (seasonal averages high 52 low 35)

 

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Forecast for Roseburg:

• Cloudy with evening showers, snow showers likely (70%) with a slight (20%) chance of thunderstorms, a good (50%) chance of rain and snow showers late tonight (0.10 in. of rain possible, 1 in. of snow possible, snow level 1,500 ft. falling to 800 ft. late tonight),
• Mostly cloudy and a bit warmer with a (30%) chance of rain and snow showers Thursday (under 0.10 in. of rain possible, snow level 200 ft. rising to 1,500 ft.), a (30%) chance of evening rain and snow showers, just mostly cloudy Thursday night (under 0.10 in. of rain possible, evening snow level 1,500 ft.),
• Mostly cloudy with a (30%) chance of AM rain and snow showers, rain and snow showers likely (70%) Friday afternoon (under 0.10 in. of rain possible, snow level 200 ft.), a good (50%) chance of rain and snow showers Friday night (0.10 in. of rain possible),
• Mostly cloudy and a bit warmer with a slight (20%) chance of rain and snow showers Saturday and at night.
• lows 33-30 warming back to 33 Friday night cooling to 30 Saturday night highs 48-50.
• Mostly cloudy with rain and snow showers and a bit cooler Sunday through Monday (a bit warmer), a slight (20%) chance of rain and snow showers Monday night,
• Mostly cloudy and a bit warmer Tuesday and at night,
• Then partly cloudy and a bit warmer Wednesday.
• highs 45-54 lows 34-32. (seasonal averages high 55 low 38)

 

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

• Cloudy with a good (50%) chance of evening coastal showers and a slight (20%) chance of thunderstorms while evening inland showers with snow showers likely (70%) and a slight (20%) chance of thunderstorms, a good (50%) chance of rain and snow showers late tonight (0.10 in. of rain possible, snow level 1,500 ft. falling to 90 ft. late),
• Mostly cloudy with a (40%) chance of AM coastal rain and snow showers with a good (50%) chance of coastal showers in the afternoon while a (30%) chance of inland rain and snow showers and a bit warmer Thursday afternoon (under 0.10 in. of rain possible, snow level 200 ft. rising to 1,500 ft. in the afternoon), a slight (20%) chance of coastal showers Thursday night while a slight (20%) chance of inland evening rain and snow showers Thursday night (evening snow level 2,000 ft.),
• Cloudy with a good (50%) chance of AM rain and snow showers, coastal afternoon showers while inland rain and snow showers likely (70%) Friday afternoon (0.25 in. of rain possible, snow level 400 ft. rising to 1,000 ft.), cloudy with evening coastal showers and a good (50%) chance of showers late while inland evening rain and snow showers likely (70%) and a good (50%) chance of rain and snow showers late Friday night (0.25 in. of rain possible),
• Mostly cloudy and a bit warmer with a (30%) chance of rain and snow showers Saturday, a slight (20%) chance of showers  Saturday night.
• lows 36-38 cooling back to 36 Saturday night highs 48-52.
• Mostly cloudy with showers and a bit cooler Sunday, a good (50%) chance of showers Sunday night and Monday (a bit warmer), a slight (20%) chance of showers Monday night,
• Just mostly cloudy and a bit warmer Tuesday and Tuesday night,
• Then partly cloudy Wednesday.
• highs 47-54 lows 35-40. (seasonal averages high 53 low 40)

 

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Forecast for the Cascades in Lane County:

• Mostly cloudy with evening snow showers, snow showers and colder late tonight (1 in. of snow possible),
• A mix of clouds and sun and a bit cooler with a (40%) chance of snow showers Thursday, mostly cloudy and cold with a good (50%) chance of snow showers late at night,
• Cloudy and a bit cooler with a good (50%) chance of snow showers Friday, evening snow showers likely (70%), a (40%) chance of snow showers late Friday night and Saturday (a bit warmer), partly cloudy with a slight (20%) chance of evening showers, then mostly cloudy with a slight (20%) chance of showers late at night.
• snow level at the surface tonight through Saturday night,
• lows 22-14 warming to 21 Saturday night highs 28-26 warming to 32 Saturday.
• Mostly cloudy and a bit cooler with snow showers Sunday, cloudy with a good (50%) snow showers at night,
• Mostly cloudy and a bit cooler with a good (50%) chance of snow showers Monday through Tuesday (a bit warmer), a (40%) chance of snow showers Tuesday night,
• Then a mix of clouds and sun and a bit warmer with a (30%) chance of snow showers Wednesday.
• snow level at the surface Sunday through Wednesday.
• highs 29-33  lows 20-22.

 

 

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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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