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Here is my new weekly weather quiz question. What is the difference between Doppler Radar and the older generation radar? Please post your answer as a comment after the forecasts on  this page. The first person to post the correct answer will win a week of free personalized weather forecasts tailored to your needs.

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The upper air flow (yellow jet stream and dark colors for winds) shows a  trough of low pressure a (“U” shape offshore) sliding Eastward into the coast as a frontal system moves slowly through the Pacific Northwest. Notice that the jet stream airflow moves so that it brings the colder air from the north and northwest toward the middle and end of the week into New Years Day.

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Advisories:  A WINTER STORM WARNING IS IN EFFECT UNTIL  7 AM WEDNESDAY FOR THE NORTH OREGON CASCADES AND THE CASCADES OF LANE COUNTY.  A WINTER WEATHER ADVISORY IS IN EFECT UNTIL 4 PM WEDNESDAY FOR THE SOUTH CENTRAL AND SOUTH CASCADES AND THE SISKIYOU MOUNTAINS OF OREGON. A WINTER WEATHER ADVISORY IS IN EFFECT FROM 4 AM UNTIL 4 PM WEDNESDAY ABOVE 1,500 FT. FOR CENTRAL DOUGLAS COUNTY, THE EASTERN DOUGLAS COUNTY FOOTHILLS,  JACKSON COUNTY, EASTERN CURRY COUNTY, AND JOSEPHINE COUNTY. A WINTER WEATHER ADVISORY IS IN EFFECT FROM 4AM UNTIL 4 PM WEDNESDAY ABOVE 1,500 FT. FOR THE SOUTH CENTRAL AND SOUTH OREGON COAST.

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Here are your detailed forecasts. **

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Forecast for the Southern and lower Mid Willamette Valley including Eugene-Springfield and Albany-Corvallis: Mostly cloudy with rain today (0.50 in. of rain possible), rain tonight then mixed with snow late tonight (snow level 1,000 ft. 1 in. of snow possible), colder with occasional showers Wednesday decreasing in the afternoon (snow level 500 ft.-800 ft. 1 in. of snow possible), rain or snow showers likely (60%) Wednesday night, a mix of clouds and sun with a  (50%) chance of  showers Thursday AM, and mostly clear Thursday night highs 50-40 lows 34-29.  Partly cloudy with a slight (20%) chance of snow showers Friday, partly cloudy Friday night, then partly cloudy Saturday (New Years Day), partly cloudy to mostly cloudy Saturday night, mostly cloudy with a slight (20%) chance of showers Sunday through Monday highs 40-45 lows near 32. (seasonal averages highs 45 low 32)

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Forecast for the Umpqua Basin including, Roseburg:  Mostly cloudy with rain today and this evening, showers late at night (snow level  2,000 ft. late),  rain and snow showers Wednesday and Wednesday night (snow level 1,000 ft. 1-2 in. of snow lower elevations and 2-3 in. of snow above 1,500 ft. Wednesday), mostly cloudy with rain and snow showers likely (60%) Thursday, then patchy fog and freezing fog with a slight (20%) chance of rain and snow showers Thursday night and Friday, and a (40%) chance of rain and snow showers Friday night highs 50-40 lows 36-27 warming to 33 Friday night. Mostly cloudy with a (40%) chance of rain and snow Saturday (New Years Day) and Saturday night, a slight (20%-30%) chance of rain and snow Sunday and Sunday night, and mostly cloudy with a (40%) chance of showers Monday highs 45-40 lows near 34-29. (seasonal averages high 48 low 34)

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Forecast for the South Oregon Coast including Coos Bay and North Bend: Mostly cloudy with rain today and windy (wind: SW 20-30 mph gusts to 45 mph), evening rain, then showers late tonight (snow level 2,000 ft.) and breezy (wind: NW 15-25 mph at the shore and NW 10-15 mph inland), coastal showers with rain and snow showers inland (snow level 1,500 ft.) Wednesday and Wednesday night (snow level 1,000 ft.), coastal showers likely (60%) Thursday with rain and snow showers likely (60%) inland (snow level 1,500 ft.), then a slight (20%) chance of showers with patchy fog late Thursday night highs 53-45 lows 39-34. AM patchy fog, mostly cloudy with a slight (20%) chance of showers Friday, a (40%) chance of showers Friday night, a (40%) chance of rain Saturday (New Years Day) and Saturday night, a slight (20%) chance of rain Sunday and (30%) Sunday night, then a (40%) chance of showers Monday highs 45-49 lows near 38. (seasonal averages high 52 lows 39).

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Forecast for the Cascades of Lane County: Cloudy with rain or snow today (5-9 in. of snow possible, 1 in. of rain possible) increasing throughout the day, rain or snow tonight (10-18 in. of snow possible), snow showers and colder Wednesday (5-9 in. of snow possible), snow showers likely (60%) Wednesday night (1-4 in. of snow possible), a (40%) chance of snow showers Thursday AM, a slight (20%) chance of afternoon snow showers, then partly cloudy Thursday night snow level 5,000 ft. today, falling to 4,500 ft. this evening, and 1,000 ft. late at night, at the surface Wednesday through Thursday, free air freezing level at the surface Thursday night highs 35-22-27 lows 21-14.  Mostly cloudy with a slight (20%) chance of snow showers Friday, a (30%) chance of snow showers at night, mostly cloudy Saturday (New Years Day) and Saturday night, mostly cloudy with a slight (20%) chance of snow showers Sunday, then a (30%) chance of snow showers Sunday night and (40%) Monday highs 30-34 lows 22-17.

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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.