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An upper level trough of Low Pressure (see the shaded “U” shaped area along the coast) is pushing the next  storm system through the Pacific Northwest. High pressure will build in making Wednesday a dry day.  Still another storm system will move toward the Oregon coast Wednesday night and Thursday bringing back the wet weather here.

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Advisories: A HIGH SURF ADVISORY IS IN EFFECT UNTIL 5PM MONDAY FOR THE SOUTH CENTRAL AN SOUTH OREGON COAST.  A WINTER WEATHER ADVISORY IS IN EFFECT UNTIL 5AM TUESDAY FOR CENTRAL DOUGLAS COUNTY (ABOVE 2,000′) AND FROM 4AM MONDAY UNTIL 5AM TUESDAY ABOVE 2,000′ FOR EASTERN CURRY COUNTY AND JOSEPHINE COUNTY, THE EASTERN DOUGLAS COUNTY FOOTHILLS , AND JACKSON COUNTY. A WINTER STORM WARNING IS IN EFFECT UNTIL 4AM MONDAY  FOR EASTERN CURRY COUNTY AND JOSEPHINE 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: Showers likely (60%) tonight through Monday night lows near 36 high 50. Mostly cloudy a (40%) chance of showers Tuesday high 55. Partly cloudy Tuesday night then a mix of clouds and sun and warmer Wednesday low 38 high 60. Partly cloudy with a (40%) chance of showers Wednesday night through Sunday lows near 37 Wednesday night to 32 Friday night and 36 Saturday night highs 52-56.

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Forecast for the Umpqua Basin including Roseburg: Rain and snow showers and a chance of thunderstorms this evening then rain and snow showers late tonight  snow level 2,000′  falling to 1,500′ late at night  low 35.  Rain and snow Monday morning with a chance of thunderstorms and afternoon rain and snow showers then rain and snow showers likely (60%) Monday night snow level 1,500′ rising to 2,000′ in the afternoon 1-2″ 0f snow possible then snow level of 3,000′ at night falling to 2,500′ late at night high 49 low 39. Mostly cloudy with a (30%) chance of rain and snow showers Tuesday morning and a (20%) chance of showers Tuesday afternoon  highs 52 lows 40. Mostly cloudy with a slight (20%) chance of showers Tuesday night low near 40. Mostly cloudy Wednesday morning with patchy fog then partly cloudy and warmer in the afternoon high 64. Mostly cloudy with a (30%) chance of showers Wednesday night and Thursday low 42 high 52. Just a slight (20%) chance of rain and snow showers Thursday night low 34. Mostly cloudy with a (40%) chance of showers Friday and Friday night high 59 low 36. A (40%) chance of rain and snow showers Saturday morning then a (30%) chance of rain showers in the afternoon and Saturday night high 59 low 35. Mostly cloudy with a (40%) chance of rain and snow showers Sunday high 60.

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Forecast for the South Oregon Coast including Coos Bay and North Bend: Mostly cloudy with a chance of snow showers and thunderstorms this evening then showers and a chance of thunderstorms inland and showers and a chance of thunderstorms at the coast tonight low 40. Mostly cloudy with showers and a chance of thunderstorms Monday morning then showers in the afternoon at the coast, snow showers and a chance of thunderstorms inland (snow level 1,500′ rising to 2,000′ in the afternoon 1″ of snow possible)  then rain and snow showers in the afternoon high near 49. Mostly cloudy Monday night at the coast and evening rain and snow   showers inland in the evening then showers likely late at night low 40. Mostly cloudy Tuesday with AM showers likely (60%) then a good (50%) chance of afternoon showers high 55. Mostly cloudy with a slight (20%) chance of showers Tuesday evening then partly cloudy and warmer Wednesday low 43  high 59. Mostly cloudy with a (40%) chance of showers Wednesday night and Thursday low 42 high 55. A slight (20%) chance of showers Thursday night low 42. Mostly cloudy with a (40%) chance of showers Friday, Saturday night and Sunday and a good (50%) chance Friday night and Saturday highs 53-56 low 40.

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Forecast for the Cascades of Lane County: Mostly cloudy snow showers likely (60%) tonight snow level 3,000′ in the evening 2″ of snow possible low 22. Mostly cloudy with snow showers Monday snow level 2,500′ in the afternoon 1-3″ of snow high 36.  Snow showers Monday night through Tuesday morning then snow showers likely (60%) in the afternoon low 23 high near 40. Partly cloudy with a slight (20%) chance of rain and snow Tuesday night snow level 4,500′ low 28. A mix of clouds and sun Wednesday free air freezing level 7,000′ and mostly cloudy with a (30%) chance of showers Wednesday night snow level 6,500′ high 50 low 26. Mostly cloudy with a (40%) chance of rain and snow showers Thursday 3,500′ high 45. Partly cloudy with a (40%) chance of rain and snow showers Thursday night through Saturday night snow level 3,000′ rising to 3,500′ Friday and 4,000′ Friday night through Saturday night lows 22-26 highs 44-46. Mostly cloudy with a (40%) chance of rain and snow showers Sunday snow level 4,000′ high near 40.

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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.