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The jet stream shows a cold trough of low pressure ( “U” shaped area) pushed down and brought winter weather  with it. A burst of cold Arctic air has dropped in behind another cold front that slid down from the North and that air mass  will move to the Northeast away from us for a little warming. Weak high pressure has cleared us out for part of the weekend at least.  Low pressure will move back in and bring precipitation with it for next week. Be careful driving on roadways that still have the remnants of snow or ice on them because they will be slippery.

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Advisories: A WINTER STORM WATCH IS IN EFFECT FROM SUNDAY MORNING THROUGH MONDAY AFTERNOON FOR THE NORTHERN COAST RANGE OF OREGON. A WINTER STORM WATCH IS IN EFFECT FROM SUNDAY EVENING THROUGH MONDAY EVENING FOR THE NORTH OREGON CASCADE FOOTHILLS AND AND THE UPPER HOOD RIVER VALLEY AND THE NORTH OREGON CASCADES (NOT INCLUDING THE FOOTHILLS OR CASCADES OF LANE COUNTY).  A WINTER WEATHER ADVISORY IS IN EFFECT FROM MIDNIGHT TONIGHT THROUGH 8 AM SUNDAY FOR THE LOWER COLUMBIA-I-5 CORRIDOR, AND THE GREATER PORTLAND-VANCOUVER AREA. A WINTER WEATHER ADVISORY IS IN EFFECT FROM 2 AM THROUGH 10 AM SUNDAY FOR THE WESTERN COLUMBIA RIVER GORGE. A HARD FREEZE WARNING IS IN EFFECT FROM 10 PM THIS EVENING THROUGH 9 AM SUNDAY FOR EASTERN CURRY COUNTY, JOSEPHINE COUNTY, AND JACKSON COUNTY. A FREEZE WARNING IS IN EFFECT FROM 10 PM THIS EVENING THROUGH 9 AM SUNDAY  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 a slight (20%) chance of  snow late tonight (not as cold), snow and rain likely (60%) early Sunday AM changing to rain likely (60%) in the afternoon and breezy (wind: S 10-15 mph increasing to S 15-25 mph in the afternoon), rain Sunday night (0.50 in. of rain possible),  rain Monday (0.75 in. of rain possible), then showers likely (60%) Monday night (0.75 in. of rain possible), rain likely (60%) Tuesday and Tuesday night lows 29-37 highs 44-47. Mostly cloudy with showers likely (60%) Thursday and Thursday night, then mostly cloudy with a (40%) chance of rain Friday through Saturday highs 46-50 lows 34-37. (seasonal  averages high 53 low 36)

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Forecast for the Umpqua Basin including, Roseburg:  Mostly cloudy with a slight (20%) chance of snow late tonight, cloudy with a good (50%) chance of rain and snow Sunday (snow level 1,000 ft.), rain and snow Sunday night (snow level 2,000 ft. falling to 1,500 ft. late, 1 in. of snow possible), rain and snow Monday (snow level 1,000 ft. rising to 2,000 ft. in the afternoon), rain and snow Monday night (snow level 1,000 ft.), rain and snow likely (60%) Tuesday and Tuesday night lows 26-38 highs 45-49. Mostly cloudy with rain Wednesday, showers Wednesday night, showers likely (60%) Thursday and Thursday night, rain and snow likely (60%) Friday, showers likely (60%) Friday night, then rain and snow likely (60%) Saturday highs 46-50 lows near 35. (seasonal averages high 57 low 37)

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Forecast for the South Oregon Coast including Coos Bay and North Bend: Mostly cloudy with a slight (20%) chance of coastal rain late tonight, a slight (20%) chance of rain and snow late tonight inland, coastal rain Sunday, rain and snow likely (60%) inland Sunday (snow level 1,000 ft.), rain Sunday night (snow level 2,000 ft.) and windy (winds: S 20-30 mph at the beaches and S 15-25 mph inland), rain Monday (AM snow level 1,500 ft.), and windy (wind: SW 20-30 mph gusts to 45 mph decreasing to SW 15-20 mph in the afternoon), rain Monday night (snow level 1,500 ft.), rain likely (60%) Tuesday, and rain Tuesday night lows 30-42 highs 47-50. Mostly cloudy with rain Wednesday, showers Wednesday night,  showers likely (60%) Thursday and Thursday night, rain likely (60%) Friday, showers likely (60%) Friday night, and rain likely (60%) Saturday highs near 48 lows near 38.(seasonal averages high 55 low 41).

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Forecast for the Cascades of Lane County:  Partly cloudy this evening, cloudy with a slight (20%) chance of snow late tonight, a good (50%) chance of snow Sunday and breezy (wind: SW 10-15 mph increasing to SW 15-25 mph),  snow Sunday night (1-4 in. of snow possible),  snow Monday (6-10 in. of snow possible) and breezy (wind: SW 15-25 mph gusts to 40 mph in the afternoon), snow showers Monday night (5-10 in. of snow possible), AM snow likely (60%), with snow and rain likely (60%) Tuesday afternoon, then rain and snow likely (60%) Tuesday night snow level at the surface tonight through Monday, 2,500 ft. late Monday night, 2,500 ft. Tuesday rising to 3,000 ft. in the afternoon, and 4,000 ft. Tuesday night lows 17-26 highs 29-34. Mostly cloudy with rain  and snow showers Tuesday, snow and rain likely (60%) Tuesday night, rain and snow Wednesday, then snow likely (60%) Wednesday night through Friday snow level 2,500 ft. Tuesday,  3,000 ft. Tuesday night, 4,000 ft. Wednesday, falling to the surface Wednesday night through Friday highs 32-38 lows 22-27.

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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.