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 AND THE PUDDING RVER AT AURORA.
• A FREEZE WARNING IS IN EFFECT FROM MIDNIGHT TONIGHT UNTIL 8 AM FRIDAY FOR THE SOUTH CENTRAL OREGON COAST AND THE CURRY COUNTY COAST.
• 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, AND JOSEPHINE 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:

• A mix of clouds and sun and a bit cooler this afternoon with a good (50%) chance of rain and snow showers (under 0.10 in. of rain possible, no snow accumulation expected, snow level 1,000 ft.), partly cloudy with a slight (20%) chance of evening rain and snow showers (under 0.10 in. of rain possible, snow level 1,000 ft.), patchy fog late tonight,
• Cloudy with a (40%) chance of AM rain and snow showers, rain and snow showers likely (70%) and a bit cooler Friday afternoon (0.25 in. of rain possible), evening rain and snow showers likely (70%), a (40%) chance of rain and snow showers late at night (0.10 in. of rain possible, little or no snow accumulation possible, snow level 1,000 ft.),
• Patchy AM fog, a mix of clouds and sun and a bit warmer Saturday afternoon, becoming mostly cloudy with a slight (20%) chance of rain and snow showers late at night (snow level 1,000 ft. late at night).
• highs 45-47 lows near 32.
• Mostly cloudy and a bit cooler with rain and snow showers Sunday (snow level 1,500 ft.), a good (50%) chance of rain and snow showers Sunday night (snow level 1,500 ft.),
• Mostly cloudy with a (40%) chance of showers and a bit warmer Monday and at night,
• A bit warmer with a good (50%) chance of showers Tuesday, just mostly cloudy Tuesday night,
• Then a mix of clouds and sun and a bit warmer Wednesday.
• highs 45-49 lows 32-36. (seasonal averages high 52 low 35)

 

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Forecast for Roseburg:

• Mostly cloudy and a bit warmer with a (30%) chance of rain and snow showers this afternoon, a (30%) chance of scattered evening rain and snow showers, just mostly cloudy with patchy fog late tonight,
• Cloudy with patchy AM fog and a slight (20%) chance of showers, a (40%) chance of rain and snow showers Friday afternoon (under 0.10 in. of rain possible, afternoon snow level 900 ft.), evening rain and snow showers likely (70%), a good (50%) chance of rain and snow showers late Friday night (0.10 in. of rain possible, snow level 1,500 ft.),
• Mostly cloudy with a (30%) chance of AM rain and snow showers, partly cloudy and a bit warmer with a (30%) chance of rain and snow showers Saturday afternoon (AM snow level 1,000 ft.), partly cloudy with a slight (20%) chance of evening showers, mostly cloudy with a slight (20%) chance of rain and snow showers late at night.
• highs 45-49 lows 30-34.
• Mostly cloudy with AM rain and snow showers, rain and snow showers and a bit cooler Sunday afternoon, cloudy with a (40%) 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:

• Mostly cloudy with a (30%) chance of isolated coastal showers this afternoon while a (30%) chance of scattered inland rain and snow showers and a bit warmer this afternoon, partly cloudy in the evening, mostly cloudy late at night with isolated evening inland rain and snow showers, patchy fog late tonight,
• Mostly cloudy with patchy AM fog and a (40%) chance of coastal showers, with coastal showers likely (70%) chance of AM rain and snow showers, coastal afternoon showers while inland rain and snow showers Friday afternoon while a slight (20%) chance of AM inland rain and snow showers with rain and snow showers likely (70%) and a bit cooler in the afternoon (0.25 in. of rain possible, snow level 200 ft. rising to 1,500 ft.), cloudy with evening coastal showers and a good (50%) chance of coastal showers late while inland evening rain and snow showers and a good (50%) chance of rain and snow showers late Friday night (0.25 in. of rain possible, snow level 1,500 ft. falling to 1,000 ft. late at night),
• Mostly cloudy and a bit warmer with a (30%) chance of coastal showers while a slight (20%) chance of inland rain and snow showers and a bit warmer Saturday afternoon (AM snow level 1,000 ft.),mostly cloudy with (40%) chance of showers Saturday night.
• highs 46-44 warming to 50 Saturday lows 35-40.
• Mostly cloudy with showers and a bit cooler Sunday, cloudy with a good (50%) chance of showers Sunday night,
• Mostly cloudy and a bit warmer with a (30%) chance of showers Monday,  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 38-40 cooling back to 38 Tuesday night. (seasonal averages high 53 low 40)

 

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Forecast for the Cascades in Lane County:

• A mix of clouds and sun and a bit cooler with a good (50%) chance of snow showers today, a good (50%) chance of evening snow showers, cold with a slight (20%) chance of snow showers late tonight,
• 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 snow showers, then mostly cloudy with a slight (20%) chance of snow showers late at night.
• snow level at the surface today through Saturday night,
• highs 28-32 lows 15-22
• 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 slight (20%) chance of snow showers Tuesday night,
• Then a mix of clouds and sun and a bit warmer Wednesday.
• snow level at the surface Sunday through Tuesday, 2,500 ft. Tuesday night, then free air freezing level at the surface Wednesday.
• highs 29-34  lows near 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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