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The jet stream shows a trough of low pressure ( “U” shaped area) swinging through the Pacific Northwest. There is another  frontal system on its way to the Pacific Northwest. It’s been a long time coming, but a high pressure ridge (“arch” shape shown at the end of the jet stream movie) will build in late in the week warming us up a bit so it will feel more like Spring. It looks like the rain will still hang around though.

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Advisories: A WINTER WEATHER ADVISORY IS IN EFFECT UNTIL 9 PM TONIGHT FOR THE NORTH OREGON CASCADES, NOT INCLUDING THE CASCADES OF LANE COUNTY. A WIND ADVISORY IS IN EFFECT FROM 11 AM UNTIL 11 PM WEDNESDAY FOR CENTRAL AND EASTERN LAKE COUNTY.

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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: Cloudy with rain tonight (0.50 in. of rain possible), mostly cloudy with rain likely (60%) Wednesday AM, a good (50%) chance of rain Wednesday afternoon (0.10 in. of rain possible), a slight (20%) chance of rain Wednesday night, just mostly cloudy Thursday, mostly cloudy with a (20%) chance of rain in the evening, a slight (20%) chance of rain late Thursday night, a (40%) chance of rain Friday, and a (30%) of showers Friday night lows 46-39 highs 60-65-59. Mostly cloudy with a good (50%) chance of showers Saturday, a (30%) chance of showers Saturday night, partly cloudy with a slight (20%) chance of showers Sunday and Monday, a (30%) chance of showers Sunday night, then mostly cloudy with a (40%) chance of showers Tuesday highs near 56 lows 38-42. (seasonal  averages high 58 low 38)

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Forecast for the Umpqua Basin including, Roseburg:  Cloudy with rain this evening, rain likely (60%) late tonight, a (30%) chance of rain Wednesday, just mostly cloudy Wednesday night, partly cloudy Thursday and Thursday night, mostly cloudy with a (30%) chance of rain Friday, a (30%) chance of showers Friday night lows 49-42 highs 69-66. Mostly cloudy with a slight (20%) chance of showers and cooler Saturday and Saturday night, partly cloudy Sunday, mostly cloudy Sunday night, partly cloudy and warmer Monday, mostly cloudy with a (30%) chance of rain Monday night, then a (40%) chance of rain Tuesday highs 54-63 cooling to 55 Tuesday lows 37-42. (seasonal averages high 62 low 39)

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Forecast for the South Oregon Coast including Coos Bay and North Bend: Cloudy with rain this evening, rain likely (60%) tonight, mostly cloudy with a (30%) chance of rain Wednesday,  just mostly cloudy Wednesday night, partly cloudy Thursday, partly cloudy Thursday and Thursday night, a slight (20%) chance of showers Friday,  and  a (30%) chance of showers Friday night lows 48-42 highs 55-61 cooling to 42 Friday night. Mostly cloudy with a slight (20%) of showers Saturday, partly cloudy with a slight (20%) chance of showers Saturday night through Sunday night, a (30%) chance of rain Monday, then a (40%) chance of rain Monday night and Tuesday highs 50-58 cooling to 53 Tuesday lows 38-42. (seasonal averages high 56 low 42).

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Forecast for the Cascades of Lane County: Mostly cloudy with rain tonight (1 in. of snow possible, 0.50 in. of rain possible),  a (40%) chance of rain Wednesday (0.25 in. of rain possible),  a slight (20%) chance of rain Wednesday night and Thursday, partly cloudy with a (20%) chance of rain Thursday night and (30%) Friday, then mostly cloudy with a (40%) chance of rain and snow showers Friday night snow level 6,000 ft. rising to 6,500 ft. late tonight, 8,000 ft. Wednesday through Thursday, 7,000 ft. Thursday night and Friday, falling to 3,500 ft. Friday night lows 35-28 highs 53-57-54. Mostly cloudy with a (40%) chance of rain and snow showers Saturday, a (30%) chance of snow Saturday night, partly cloudy with a (20%) chance of rain and snow showers Sunday, mostly cloudy with a slight (20%) chance of rain and snow showers Sunday night, partly cloudy with a (30%) chance of showers Monday, then mostly cloudy with a good (50%) chance of showers Monday night and Tuesday snow level 3,500 ft. Saturday, 2,500 ft. Saturday night,  4,000 ft. Sunday, 4,500 ft. Sunday night, 5,500 ft. Monday, rising to 7,000 ft. Monday night, and 6,000 ft. Tuesday highs 38-48 cooling to 43 Tuesday lows 23-33.

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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.