A high pressure ridge is slowly getting weaker and drifting northward.  A storm system will slide under the bottom of the ridge Wednesday and move through Northern California swinging some precipitation northward into the southern part of Oregon, mainly along the coast.  Later in the week, Thursday night into Friday, a stronger storm system will bring a better chance of rain.

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Advisories:  A FROST ADVISORY IS IN EFFECT FROM 2 AM TO 8 AM MONDAY FOR THE SOUTH CENTRAL OREGON COAST.

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Forecast for the Southern Willamette Valley including Eugene-Springfield and Albany-Corvallis:   Mostly clear and cold again tonight low near 25. AM fog and possible  patchy freezing fog Monday morning, then mostly sunny,  partly cloudy at night high 55 low 27.  A mix of clouds and sun Tuesday morning and mostly cloudy in the afternoon with a (30%) chance of rain then a good (50%) chance of rain Tuesday night high 52 low 40. Rain likely (60%) Wednesday and Wednesday night high 54 low 42. Rain likely (60%) Thursday, Thursday night and Friday highs 53-55 low 45. Partly cloudy with a good (50%) chance of rain Friday night and a (40%) chance of showers Saturday low 42 high 54. Partly cloudy with a (40%) chance of showers Saturday night and Sunday low 43 high 55.

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Forecast for the Umpqua Basin including Roseburg:  Mostly clear with late night patchy fog low 30. Sunny and pleasant Monday high 60. Partly cloudy with a (20%) chance of rain late Monday night low 36. Mostly cloudy with a good (50%) chance of rain Tuesday and rain likely (60%) Tuesday night  and Wednesday high 55 low 40. Showers likely (60%) Wednesday night and Thursday low 44 high 58. Rain likely (60%) Thursday night and showers likely (60%) Friday  low 40 near 57.  Mostly cloudy with a (50%) chance of showers Friday night and Saturday low 42  high 57. Partly cloudy with a (40%) chance of showers Saturday night low 40. Mostly cloudy with a (30%) chance of showers Sunday high 55.

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Forecast for the South Oregon Coast including Coos Bay and North Bend:  A FROST ADVISORY  is in effect from 2 AM to 8 AM Monday. Mostly clear with areas of frost late tonight and early Monday morning low 34. Sunny and pleasant Monday high 56. Mostly cloudy with a slight (20%) chance of evening showers then a good (50%) chance of rain late Monday night along the coast and only a slight (20%) chance of rain late inland low 42. Mostly cloudy with rain likely (60%) Tuesday and Wednesday with rain Tuesday night highs 55 low 43. Showers likely (60%) Wednesday night and Thursday low 46 high 56.  Mostly cloudy with rain likely (60%) Thursday  night and showers likely (60%) Friday low 43 high 53. Mostly cloudy with a good (50%) chance of showers and breezy Friday night low 45. Partly cloudy with a good (50%) chance of showers Saturday and a (40%) chance Saturday night high near 55 low 44. Mostly cloudy with a (40%) chance of showers Sunday high 55.

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Forecast for the Cascades of Lane County:  Clear tonight and mostly sunny Monday free air freezing level 4,500′ rising to 5,000′ Monday AM then 5,500′ in the afternoon low 25 high 43. Mostly clear Monday night free air freezing level rising to  6,500′ low 25. A mix of clouds and sun  Tuesday morning then mostly cloudy with a slight (20%) chance of rain and snow, snow level 5,000′ high 38. Rain likely (60%) Tuesday night with a (30%) chance of snow, snow level 4,000′ low 30. Rain and snow Wednesday then likely (60%) at night snow level 4,000′ falling to 3,500′ high 38 low 32. Mostly cloudy with a good (50%) chance of rain and snow Thursday snow level 4,000′ high 40. Rain likely (60%) Thursday night and rain and snow likely (60%) Friday snow level 5,000′ falling to 4,500′ low 32 high 42.  Mostly cloudy with a good (50%) chance of rain and snow Friday night snow level 4,000′ low 30. Mostly cloudy with a  good (50%) chance of rain and snow showers Saturday through Sunday snow level 3,500′ falling to 3,000′ Saturday night and 3,500′ Sunday highs 40 low 30.

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