A high pressure ridge , called an “Omega Block” because it is shaped like the Greek letter omega, will get stronger and move North a bit, but still plenty of sunshine and mild temperatures through rest of the weekend into early next week. A storm will slide under the bottom of the ridge and brush the extreme southern part of Oregon, mainly along the coast, which could produce a slight chance of showers late tonight and Sunday. A weak storm system will move toward the West Coast between Tuesday night and Wednesday and that will be our next chance for a slight chance rain in Western Oregon. Later in the week 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 BOTH SUNDAY AND MONDAY FOR THE SOUTH CENTRAL OREGON COAST, MAINLY INLAND FROM THE BEACHES.

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Forecast for the Southern Willamette Valley including Eugene-Springfield and Albany-Corvallis:   Mostly clear and cold again tonight low 27. Mostly sunny Sunday high 56. Mostly clear and cold Sunday night low near 25. AM fog and possible freezing fog Monday morning and partly cloudy at night high 57 low 34. Mostly cloudy with a (40%) chance of rain Tuesday and Tuesday night high 55 low 40 . Rain likely (60%) Wednesday through Friday highs 53-55 lows 40. Mostly cloudy with a good (50%) chance of rain Friday night and Saturday low 42 high 55.

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Forecast for the Umpqua Basin including Roseburg: Mostly clear with patchy fog tonight low 34. Partly cloudy with a slight (20%) chance of rain in the afternoon Sunday high 56. Partly cloudy with a slight (20%) chance of showers Sunday evening then clearing to mostly clear late night with patchy fog low 34. Sunny Monday then partly cloudy with a (20%) chance of rain at night  high 59 low 36. Mostly cloudy with a good (50%) chance of rain Tuesday and showers likely (60%) Tuesday night  high 55 low 44. Rain likely (60%) Wednesday and showers likely (60%) Wednesday night high 58 low 44. Rain likely Thursday through Friday highs near 58 low 45. Showers likely (60%) Friday night and a good (50%) chance Saturday morning, then a good (50%) chance of rain and snow showers in the afternoon low 40 high 57.

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Forecast for the South Oregon Coast including Coos Bay and North Bend: Becoming mostly cloudy with a slight (20%) chance of showers along the coast very late tonight and partly cloudy inland with areas of frost late evening and very early in the morning and a slight (20%) chance of showers toward morning low 35. Partly cloudy with a slight (20%) chance of showers Sunday morning and a slight (20%) chance of afternoon rain at the coast partly cloudy inland with a slight (20%) chance of AM showers then mostly cloudy with a slight (20%) chance of afternoon rain high 55. Partly cloudy with a slight (20%) chance of evening showers Sunday then areas of frost late at night low 34. Sunny Monday morning then partly cloudy in the afternoon and mostly cloudy with a (30%) chance of rain Monday night high 56 low 43. Mostly cloudy with a good (50%) chance of AM rain rain Tuesday then likely (60%) in the afternoon high 53. Showers likely (60%) Tuesday night low in the low 40s. Rain likely (60%) Wednesday and showers likely (60%) Wednesday night high 56 low 44. Mostly cloudy with rain likely (60%) Thursday and Thursday night high 56 low 44. Showers likely (60%) Friday and a good (50%) chance of showers Friday night and Saturday highs near 55 low 43.

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Forecast for the Cascades of Lane County:  Mostly clear tonight free air freezing level 5,000? low 24. Mostly sunny Sunday free air freezing level at 3,000′ rising to 4,000′ high 34. Mostly clear Sunday night free air freezing level 4,000? low 25. Sunny Monday free air freezing level rising to 5,000? high 40. Partly cloudy Monday night free air freezing level holding at 4,000′ low 30. Mostly cloudy Tuesday with rain and snow likely (60%) 4,500? high 40. Rain and snow likely (60%) Tuesday night through Wednesday night snow level 4,000? rising to 4,500? lows 32 highs   42. Mostly cloudy with rain likely (60%) Thursday and Thursday night snow level 4,500′ to 5,000′ high 42 low 32.  Rain and snow likely (60%) Friday snow level 4,500′ high 41. A good (50%) chance of rain and snow Friday night and Saturday snow level 4,500? falling to 4,000′ low 30 high 39.

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