________________

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.

________________

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 pushed through the Pacific Northwest and another frontal system will follow close behind tonight into Tuesday (position shown on Wednesday).

_______________

Advisories:  A WINTER STORM WARNING IS IN EFFECT FROM 4 PM THIS AFTERNOON UNTIL  10 PM TUESDAY FOR THE NORTH OREGON CASCADES AND THE CASCADES OF LANE COUNTY.  A WINTER WEATHER ADVISORY IS IN EFECT FROM 10 PM TONIGHT UNTIL 10 AM WEDNESDAY FOR THE SOUTH CENTRAL AND SOUTH CASCADES AND THE SISKIYOU MOUNTAINS OF OREGON. A WINTER STORM WATCH IS IN EFFECT FROM TUESDAY EVENING THROUGH WEDNESDAY MORNING ABOVE 2,000 FT. FOR CENTRAL DOUGLAS COUNTY, THE EASTERN DOUGLAS COUNTY FOOTHILLS,  JACKSON COUNTY, EASTERN CURRY COUNTY, AND JOSEPHINE COUNTY. A HIGH WIND WARNING IS IN EFFECT FROM 4 PM THIS AFTERNOON THROUGH 7 AM TUESDAY FOR THE NORTH AND CENTRAL OREGON COAST.

________________

Here are your detailed forecasts. **

_________________

Forecast for the Southern and lower Mid Willamette Valley including Eugene-Springfield and Albany-Corvallis: Mostly cloudy with showers likely (60%) this AM, light rain likely (60%) in the afternoon (0.25 in. of rain possible),  rain tonight (1.0 in of rain possible) and Tuesday (0.75 in. of rain possible) and Tuesday night (0.25 in. of rain possible), showers likely (60%)(snow level 500 ft.-1,000 ft. 1 in. of snow possible, 0.25 in. of rain possible) Wednesday, then a (40%) chance of showers Wednesday night highs 50-40 lows 44-30. Mostly cloudy with a good (50%) chance of  showers Thursday, a  slight (20%) chance of showers Thursday night, a mix of clouds and sun Friday,  partly cloudy with a slight (20%) chance of showers Friday night, then mostly cloudy with a slight (20%) chance of showers Saturday (New Years Day) through Sunday highs 37-42 lows 28-32. (seasonal averages highs 45 low 32)

__________________

Forecast for the Umpqua Basin including, Roseburg:  Mostly cloudy with rain likely (60%) this AM, rain this afternoon (snow level 3,500 ft.), rain tonight through Tuesday evening, rain and snow late at night (snow level  3,500 ft. falling to 1,500 ft. late),  rain and snow showers Wednesday (snow level 500 ft.), then rain and snow showers likely (60%) Wednesday night highs 50-40 lows 43-33. Mostly cloudy with rain and snow showers Thursday AM, rain and snow showers likely (60%) Thursday afternoon, a (40%) chance of rain and snow showers Thursday night, mostly cloudy with a good (50%) chance of rain and snow Friday, a (40%) chance of rain and snow Friday night and Saturday (New Years Day), then partly cloudy with a (40%) chance of rain and snow showers Saturday night and a slight (20%) chance of rain and snow showers Sunday highs 40-45 lows near 26-34. (seasonal averages high 48 low 34)

_______________

Forecast for the South Oregon Coast including Coos Bay and North Bend: Mostly cloudy with rain likely (60%) this AM, rain this afternoon and windy (wind: S 20-30 mph at the shore and S 10-20 mph inland), rain tonight and windy (wind: S 25-40 mph gusts to 50 mph then 55 mph late tonight at the shore and S 15-25 mph inland), then rain Tuesday and  breezy (wind: S 20-30 mph shifting W 20-30 mph in the afternoon at the shore and SW 15-25 mph gusts to 40 mph), rain Tuesday night, coastal showers with rain and snow showers Wednesday, then rain and snow showers likely (60%) Wednesday night highs 54-44 lows 42-32. Mostly cloudy with AM rain and snow showers, rain and snow showers likely (60%) Thursday afternoon, a (60%) chance of rain and snow showers Thursday night, mostly cloudy with a good (50%) chance of rain Friday through Saturday (New Years Day),  then partly cloudy with a (40%) chance of showers Saturday night and mostly cloudy with a slight (20%) chance of showers Sunday highs 44-49 lows 32-38. (seasonal averages high 52 lows 39).

_________________

Forecast for the Cascades of Lane County: Cloudy with showers this AM, snow or rain likely (60%) in the afternoon (2-5 in. of snow possible), snow or rain tonight (15-20 in. of snow possible), then rain or snow Tuesday AM, afternoon showers (8-14 in. of snow possible), then snow at times Tuesday night (4-9 in. of snow possible) snow level 2,500 ft. rising to 4,000 ft. late tonight, 4,000 ft. falling to 3,000 ft. Tuesday, falling to 2,000 ft. Tuesday night highs 32-35 lows 30-20. Mostly cloudy with snow showers Wednesday (3-5 in. of snow possible),  snow showers likely (60%) Wednesday night and Thursday, partly cloudy Thursday night, a mix of clouds and sun Friday, partly cloudy Friday night, partly cloudy with a slight (20%) chance of snow showers Saturday (New Years Day), then mostly cloudy with a slight (20%) chance of snow showers Saturday night and Sunday snow level at the surface through Thursday, free air freezing level at the surface Thursday night through Friday night, and a snow level at the surface Saturday through Sunday highs 23-30 lows 14-24.

_________________

**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.