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Advisories:   A HIGH WIND WATCH IS IN EFFECT FROM MONDAY MORNING THROUGH MONDAY EVENING FOR NORTHERN AND EASTERN KLAMATH COUNTY, AND WESTERN, CENTRAL, AND EASTERN LAKE COUNTY.

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A trough of low pressure (“U” shape on the yellow line) is moving eastward toward us as a high pressure ridge (“Arch” shape on the yellow line) that has been over us slides eastward. A  frontal system is on its way to us from the Gulf of Alaska to produce a bit of rain for your Monday. The air mass is cold behind it so the snow levels will fall behind it. Another frontal system (position shown is Wednesday) will continue the threat of rain next week.

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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 areas of fog this AM, mostly sunny this afternoon, partly cloudy this evening, mostly cloudy tonight, mostly cloudy with a good (50%) chance of AM rain, rain (0.15 in. of rain possible) Monday afternoon, showers likely (60%) Monday evening, rain and snow showers lat Monday night (0.50 in. of rain possible), mostly cloudy with a good (50%) chance of snow showers Tuesday AM, a (40%) chance of rain and snow showers in the afternoon, then just partly cloudy Tuesday night highs 57-45 lows 37-27. A mix of clouds and sun Wednesday, partly cloudy Wednesday night, a mix of clouds and sun Thursday, mostly cloudy Thursday night and Friday, cloudy with a (40%) chance of showers Friday night, then mostly cloudy with a (40%) chance of showers Saturday highs 50-57 cooling to near 50 Saturday lows 35-40. (seasonal averages high 54 low 36)

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Forecast for the Umpqua Basin including Roseburg: Mostly cloudy with patchy fog this AM, becoming mostly sunny in the afternoon, mostly clear in the evening, partly cloudy tonight, mostly cloudy with a slight (20%) chance of rain Monday AM, rain (0.15 in. of rain possible) in the afternoon, showers in the evening, rain and snow showers (0.20 in. of rain possible) and colder Monday night (under 0.01 in. of rain possible), a (40%) chance of showers Tuesday AM, then partly cloudy Tuesday night highs 62-56 lows 42-34. Mostly cloudy Wednesday, partly cloudy Wednesday night, mostly cloudy Thursday through Friday, then cloudy with a (40%) chance of showers Friday night and Saturday highs 54-58 cooling to 53 Saturday lows 34-40. (seasonal averages high 56 low 38)

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Forecast for the South Oregon Coast including Coos Bay and North Bend: Partly cloudy this evening, mostly cloudy tonight with patchy fog late at night and Monday AM with a (%) chance of AM rain, rain in the afternoon (0.30 in. of rain possible), evening, showers inland with coastal showers, inland rain and snow showers (1 in. of snow possible, 0.30 in. of rain possible) late Monday night (snow level 1,500 ft. late at night), a good (50%) chance of coastal showers Tuesday with a (40%) chance of AM rain and snow showers inland and a slight (20%) chance of afternoon showers inland Tuesday (snow level 1,000 ft. rising to 2,000 ft. in the afternoon, under 0.01 in. of rain possible), partly cloudy Tuesday evening, clear at night, sunny Wednesday, then partly cloudy Wednesday night lows 42-35 highs 54-46. Mostly sunny Thursday, mostly clear at night, partly cloudy Friday, cloudy with a (30%) chance of showers Friday night, mostly cloudy with a (40%) chance of showers Saturday, then cloudy with a (%) chance of showers Saturday night and Sunday highs 49-55 cooling to near 50 Saturday lows 37-45 cooling to 38 Friday night. (seasonal averages high 54 low 41).

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Forecast for the Cascades of Lane County: Mostly sunny this afternoon, partly cloudy tonight, mostly cloudy with a good (50%) of AM rain and snow Monday, rain and snow (4-8 in. of snow possible, 0.50 in. of rain possible) in the afternoon and breezy (wind: SW 10-15 mph increasing to SW 15-25 mph in the afternoon), evening rain and snow showers, snow showers and colder late Monday night (0.30 in. of rain possible), cloudy with AM snow showers likely (60%) Tuesday (0.10 in. of rain possible), a slight (20%) chance of snow showers in the afternoon and Tuesday night snow level 9,000 ft. today, 8,000 ft. tonight, snow level 4,500 ft., Monday, 3,500 ft. Monday evening,  at the surface Tuesday and Tuesday night highs 48-25 lows 28-16. Partly cloudy with a slight (20%) chance of snow showers Wednesday, just partly cloudy Wednesday night, a mix of clouds and sun Thursday, mostly cloudy Thursday night and Friday, cloudy with a (40%) chance of rain and snow showers Friday night, then cloudy with a (40%) chance of showers Saturday snow level at the surface Wednesday, free air freezing level 5,500 ft. Wednesday night and 7,000 ft. Thursday night, 8,000 ft. Friday, snow level 6,000 ft Friday night, then 4,500 ft. Sunday highs 36-48 cooling to near 40 Friday lows 25-27.

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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.

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Get your local Eugene-Springfield news on-line at Eugene Daily News.com.

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