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Advisories: A WIND ADVISORY IS IN EFFECT FROM 10 AM THROUGH 10 PM MONDAY 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: Partly cloudy this evening, mostly cloudy with patchy fog late tonight, mostly cloudy with a good (50%) chance of AM rain, rain (0.25 in. of rain possible) Monday afternoon, showers Monday evening, rain and snow showers likely (60%) late Monday night (1in. of snow possible, 0.50 in. of rain possible), mostly cloudy with a good (50%) chance of showers Tuesday AM, a (30%) chance of showers in the afternoon, partly cloudy with patchy fog late Tuesday night and Wednesday AM, partly cloudy in the afternoon, then mostly clear Wednesday night lows 37-27 warming to 35 Wednesday night highs 49-45 warming to 52 Wednesday. Mostly sunny Thursday, mostly clear at night, partly cloudy Friday, cloudy with a slight (20%) chance of rain Friday night, mostly cloudy with a (40%) chance of showers Saturday, cloudy with a (40%) chance of showers Saturday night, then mostly cloudy with a good (50%) chance of showers Sunday highs 55-50 warming to near 55 Sunday lows 38-43. (seasonal averages high 54 low 36)
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Forecast for the Umpqua Basin including Roseburg: Mostly clear this evening, becoming mostly cloudy with patchy fog late tonight and Monday AM, a slight (20%) chance of rain AM too, 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 (snow level 2,500 ft. falling to 1,000 ft. late, 1 in. of snow possible, under 0.01 in. of rain possible), a good (50%) chance of rain and snow showers Tuesday (snow level 1,000 ft. rising to 2,000 ft. in the afternoon), partly cloudy in the evening, mostly clear late Tuesday night, then partly cloudy Wednesday and Wednesday night lows 39-26 warming to near 32 Wednesday night highs 55-45 warming to near 50 Wednesday. Mostly sunny Thursday, mostly clear Thursday night, partly cloudy Friday, cloudy with a (40%) chance of showers Friday night through Saturday night, then cloudy with a good (50%) chance of showers Sunday highs 62-50 warming to 56 Sunday lows 38-36. (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 good (50%) 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 40-33 highs 48-50 warming to 55 Wednesday. 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 good (50%) chance of showers Saturday night then showers likely (60%) Sunday highs 56-48 warming to near 55 Sunday lows 33-40. (seasonal averages high 54 low 41).
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Forecast for the Cascades of Lane County: Partly cloudy this evening, mostly cloudy tonight, a good (50%) of AM rain and snow Monday, rain and snow (1-4 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 gusts to 40 mph), evening rain and snow showers, snow showers and colder late Monday night (3-6 in. of snow possible, 0.25 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 evening, partly cloudy late Tuesday night, mostly sunny Wednesday AM, then just partly cloudy in the afternoon and Wednesday night snow level 9,000 ft.falling to 7,500 ft. late tonight, 4,500 ft., Monday, 3,500 ft. Monday evening, at the surface Tuesday and Tuesday night, free air freezing level at the surface rising to 4,000 ft. Wednesday afternoon, then 7,500 ft. Wednesday night lows 28-16 warming to near 25 Wednesday night highs 39-26 warming to near 40 Wednesday. Mostly sunny Thursday, partly cloudy Thursday night and Friday, cloudy with a slight (20%) chance of rain Friday night, a (40%) chance of showers Saturday, cloudy with a (40%) chance of rain and snow showers Saturday night, then cloudy with a good (50%) chance of showers Sunday free air freezing level 7,000 ft, Thursday, 9,000 ft. Thursday night, 9,000 ft. Friday, snow level 6,500 ft. Friday night, 5,000 ft. Saturday and Saturday night, then 6,500 ft. Sunday highs 47-38 warming to near 46 Sunday 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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