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The jet stream shows a trough of low pressure ( “U” shaped area) swinging through the Pacific Northwest with another one following behind it. A frontal system moved through the area bringing a mixture of sunshine  and wet weather. We’ll see another frontal system move in Tuesday. 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 next week into the weekend warming us up so it will feel more like Spring. It’s about time.

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Advisories:   A WINTER WEATHER ADVISORY IS IN EFFECT  FROM 10 AM UNTIL 8 PM  TODAY FOR THE SOUTH CENTRAL AND SOUTH OREGON CASCADES, AND THE SISKIYOU MOUNTAINS.

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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 AM rain, showers and a slight (20%) chance of thunderstorms this afternoon and evening (0.50 in. of rain possible, and small hail possible), a good (50%) chance of showers late tonight (0.10 in. of rain possible), cloudy Monday AM, a mix of clouds and sun in the afternoon with a (60%) chance of showers (0.10 in. of rain possible), rain likely (60%) Monday night (0.10 in. of rain possible), rain likely (60%) Tuesday, then a (30%) chance of showers Tuesday night highs 48-57 lows 40-43. Partly cloudy with a (40%) chance of showers Wednesday, mostly cloudy with a slight (20%) chance of showers Wednesday night, partly cloudy with a slight (20%) chance of showers Thursday, mostly cloudy with a good (50%) chance of showers Thursday night, partly cloudy with a good (50%) chance of showers Friday, then mostly cloudy with a (40%) chance of showers Friday night and Saturday highs 60-63 cooling 57 by Saturday lows near 42. (seasonal  averages high 57 low 37)

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Forecast for the Umpqua Basin including, Roseburg:  Mostly cloudy with AM rain, showers this afternoon (snow level 2,500 ft. rising to 3,000 ft. in the afternoon), showers this evening and tonight (snow level 3,000 ft.), a good (50%) chance of showers Monday (snow level 3,000 ft.), cloudy with showers likely (60%) Monday night (snow level 3,000 ft.), showers likely (60%) Tuesday, then mostly cloudy with a slight (20%) chance of  showers Tuesday night highs 52-60 cooling back to 55 Tuesday lows 40-43. Mostly cloudy with a slight (20%) chance of showers and warmer Wednesday, just partly cloudy Wednesday night and Thursday, mostly cloudy with a slight (20%) chance of showers Thursday night, then a (40%) chance of showers Friday through Saturday highs 62-68 cooling to near 57 Friday and Saturday lows 45-42. (seasonal averages high 61 low 39)

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Forecast for the South Oregon Coast including Coos Bay and North Bend: Mostly cloudy with AM rain, afternoon showers today and windy (wind: SW 20-30 mph decreasing to SW 10-20 mph late in the afternoon), showers this evening, a good (50%) chance of coastal showers late tonight, showers likely (60%) late at night inland, showers Monday, coastal showers likely (60%) Monday night, a good (50%) chance of evening showers, then showers likely (60%) late Monday night inland, showers likely (60%) Tuesday, then a slight (20%) chance of showers Tuesday night highs 48-55 lows 42-45. Partly cloudy with a slight (20%) chance of showers Wednesday and Wednesday night, a (40%) chance of showers Thursday, then mostly cloudy with a good (50%) chance of showers Thursday night and Friday, (40%) chance of showers Friday night, then a Slight (20%) chance of showers Saturday highs 60-52 lows 45-40. (seasonal averages high 56 low 42).

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Forecast for the Cascades of Lane County: Mostly cloudy with AM snow, rain and snow showers this afternoon (4-7 in. of snow possible), snow showers tonight (2-5 in. of snow possible), a good (50%) chance of snow showers Monday, snow and rain likely (60%) Monday night, rain and snow showers Tuesday, then a good (50%) chance of rain and snow showers Tuesday night snow level 2,500 ft. rising to 3,500 ft. today, 2,500 ft. tonight, then 3,500 ft. Monday afternoon, 3,000 ft. Monday night, then 3,500 ft. Tuesday and Tuesday night highs 34-44 lows 25-32.  Mostly cloudy with a (30%) chance of rain and snow showers Wednesday, partly cloudy with a slight (20%) chance of showers Wednesday night, mostly cloudy with a (40%) chance of showers Thursday and Thursday night, a good (50%) chance of rain and snow showers Friday, a (40%) chance of showers Friday night, then a (40%) chance of rain and snow showers Saturday snow level 4,000 ft. Wednesday, then rising to 6,000 ft. Wednesday night through Thursday night, 4,500 ft. Friday, 5,500 ft. Friday night, then falling to 3,500 ft. Saturday highs 45-50 and back to 45 Saturday lows near 32.

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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.