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 with Northwesterly airflow. The graphic for days 1-3 shows the frontal system moving through the Pacific Northwest. The graphic for days 3-7 shows no particular surface fronts for the week until next 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 35 in the Good category measuring Particulate Matter.

Oakridge: The Air Quality Index is 11 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 DENSE FOG ADVISORY IS IN EFFECT UNTIL NOON TODAY FOR THE GREATER PORTLAND METRO AREA.
• 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 FROM 11 AM TODAY 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 UNTIL 4 AM THURSDAY FOR CENTRAL DOUGLAS COUNTY, EASTERN CURRY COUNTY, AJOSEPHINE COUNTY, AND JACKSON COUNTY.
• A WINTER WEATHER ADVISORY IS IN EFFECT UNTIL 10 PM TONIGHT FOR THE EASTERN DOUGLAS COUNTY FOOTHILLS, AND THE SOUTH CENTRAL OREGON CASCADES, 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 rain and snow showers likely (70%) and a bit cooler this afternoon (0.10 in. of rain possible, no snow accumulation expected, snow level 1,500 ft.), evening rain and snow showers likely (70%), a good (50%) chance of rain and snow showers tonight (0.10 in. of rain possible, no accumulation expected, snow level 1,000 ft.),
• Mostly cloudy with a slight (20%) chance of AM rain and snow showers, a good (50%) chance of rain and snow showers Thursday afternoon (snow level 1,000 ft.) and evening, a slight (20%) chance of rain and snow showers late at night (snow level 1,000 ft.),
• Cloudy with a good (50%) chance of AM rain and snow showers, rain and snow showers likely (70%) Friday afternoon (snow level 1,000 ft.), then cloudy with a (40%) chance of rain and snow showers Friday night (snow level 1,000 ft.).
• highs near 46 lows 32-30.
• Mostly cloudy and a bit warmer with a slight (20%) chance of rain and snow showers Saturday (snow level 1,000 ft.), a slight (20%) chance of showers at night,
• Mostly cloudy and a bit cooler with a (40%) chance of rain and snow showers Sunday (snow level 1,000 ft.), a (40%) chance of showers Sunday night,
• A good (50%) chance of rain and snow showers Monday (snow level 1,500 ft.), a (40%) chance of showers at night,
• Then cloudy and a bit warmer with a (40%) chance of showers Tuesday.
• highs 44-46 warming to 48 Tuesday lows 29-32 warming to 34 Monday night. (seasonal averages high 52 low 35)

 

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Forecast for Roseburg:

• Cloudy with rain and snow showers likely (70%) and a bit cooler this afternoon (0.25 in. of rain possible, 2-3 in. of snow possible, snow level 1,500 ft.), evening showers and snow showers with a slight (20%) chance of thunderstorms, rain and snow showers late tonight (0.10 in. of rain possible, 1 in. of rain possible, snow level 1,500 ft. falling to 800 ft. late tonight),
• Mostly cloudy with a (40%) chance of rain and snow showers Thursday (under 0.10 in. of rain possible, snow level 200 ft. rising to 1,000 ft.), a (30%) chance of rain and snow showers Thursday night (snow level 800 ft. late at night),
• Cloudy with a slight (20%) chance of AM rain and snow showers, rain and snow showers likely (70%) Friday afternoon, a good (50%) chance of rain and snow showers Friday night.
• highs near 44 lows 32-30 warming to 33 Friday night.
• Mostly cloudy and a bit warmer with a slight (20%) chance of rain and snow showers Saturday, just mostly cloudy Saturday night,
• Mostly cloudy with a good (50%) chance of rain and snow showers Sunday and at night,
• A (30%) chance of rain and snow showers and a bit warmer Monday and Monday night,
• Then mostly cloudy and a bit warmer with a slight (20%) chance of rain and snow showers Tuesday.
• highs 48-52 lows 32-35. (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 coastal showers likely (70%) with a slight (20%) chance of thunderstorms and a bit cooler this afternoon while inland rain and snow showers likely (70%) this afternoon (0.25 in. of rain possible,  1 in. of snow possible, snow level 1,500 ft.), cloudy with evening coastal showers and a slight (20%) chance of thunderstorms while evening inland showers and snow showers with a slight (20%) chance of thunderstorms, rain and snow showers likely (70%) late tonight (0.25 in. of rain possible, 1-2 in. of snow possible, snow level 1,000 ft.),
• Mostly cloudy with a (40%) chance of AM coastal rain and snow showers with a good (50%) chance of showers in the afternoon while a (30%) chance of inland rain and snow showers and a bit warmer Thursday afternoon and evening (0.10 in. of rain possible, snow level 200 ft. rising to 1,500 ft. in the afternoon), a (30%) chance of coastal showers while a (30%) chance of inland rain and snow showers Thursday night (snow level 1,500 ft. falling to 1,000 ft.),
• Cloudy with a good (50%) chance of AM rain and snow showers, rain and snow showers likely (70%)  Friday afternoon (snow level 1,000 ft.), evening showers likely (70%), then a (40%) chance of rain and snow showers late Friday night.
• highs near 46 lows 35-37.
• Mostly cloudy and a bit warmer with a slight (20%) chance of rain and snow showers Saturday, just mostly cloudy Saturday night,
• Mostly cloudy with a good (50%) chance of showers Sunday, a (40%) chance of rain and snow showers at night,
• Mostly cloudy with a (40%) chance of showers and a bit warmer Monday and Monday night,
• Then mostly cloudy and a bit warmer with a slight (20%) chance of showers Tuesday.
• highs 50-54 lows 36-40. (seasonal averages high 53 low 40)

 

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Forecast for the Cascades in Lane County:

• Mostly cloudy with snow showers (2 in. of snow possible) likely (70%), snow showers likely (70%) tonight (2 in. of snow possible),
• Mostly cloudy and a bit cooler with a good (50%) chance of snow showers Thursday and in the evening, a slight (20%) chance of snow showers late at night,
• Then cloudy with a slight (20%) and a bit warmer with a good (50%) chance of snow showers Friday afternoon, evening snow showers likely (70%), a (40%) chance of snow showers late Friday night.
• snow level at the surface today through Friday night.
• highs 30-28 warming back to 30 Friday lows 18-15 warming back to 18 Friday night.
• Mostly cloudy a (320%) chance of AM snow showers, a bit warmer with a slight (20%) chance of snow showers Saturday afternoon, a slight (20%) chance of snow showers late Saturday night,
• Mostly cloudy and a bit cooler with a good (50%) chance of 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 and Monday night,
• Then mostly cloudy and a bit warmer with a (40%) chance of snow showers Tuesday
• snow level at the surface Saturday through Tuesday.
• highs 33-30 warming to 34 Tuesday lows near 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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