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The upper airflow shows a stronger high pressure ridge approaching the Pacific Northwest, but a weak disturbance is sliding down in front of it which will bring clouds, but not much chance of precipitation. The next ridge will protect us at least until next weekend when the computer models indicate a wet weather pattern may begin. Remember that, particularly this time of the year, when it’s not raining it is usually fogging.
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Advisories: AN AIR STAGNATION ADVISORY IS IN EFFECT FROM 4 AM TUESDAY UNTIL 4 PM SATURDAY FOR CENTRAL DOUGLAS COUNTY, INCLUDING ROSEBURG, AND EASTERN CURRY COUNTY, JOSEPHINE COUNTY, AND JACKSON 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 and Albany-Corvallis: Mostly cloudy tonight and Monday AM, a mix of clouds and sun with a slight (20%) chance of rain Monday afternoon, a slight (20%) chance of evening rain, patchy fog late at night, AM clouds Tuesday with partly cloudy skies and patchy lingering fog throughout the day, then patchy fog again Tuesday night lows 38-27 highs 53-47. A mix of clouds and sun Wednesday through Friday, partly cloudy Wednesday night and Thursday night, mostly cloudy Friday night and Saturday, partly cloudy Saturday night, then a mix of clouds and sun Sunday highs 49-53 lows 28-38. (seasonal averages highs 47 low 33)
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Forecast for the Umpqua Basin including, Roseburg: Mostly cloudy with areas of fog late tonight and early Monday AM, partly cloudy Monday afternoon and evening, mostly cloudy with patchy fog late Monday night and early Tuesday AM, partly cloudy Tuesday afternoon, then mostly clear Tuesday night lows 39-34 high 58-52. Partly cloudy with patchy AM and late night fog Wednesday through Friday, just mostly cloudy Friday night through Saturday night, then partly cloudy Sunday highs 54-50 lows 34-39. (seasonal averages high 51 low 35)
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Forecast for the South Oregon Coast including Coos Bay and North Bend: Mostly cloudy with areas of fog late tonight and early Monday AM, partly cloudy Monday afternoon and evening, mostly cloudy with patchy fog late Monday night and early Tuesday AM, partly cloudy Tuesday afternoon, mostly clear at night, then partly cloudy Wednesday and Wednesday night lows 40-35 highs 55-62. Partly cloudy with patchy AM and late night fog Thursday and Thursday night, AM fog, then mostly cloudy Friday and Friday night, mostly cloudy with a slight (20%) chance of rain Saturday and Saturday night, then just partly cloudy Sunday highs 56-49 lows near 37. (seasonal averages high 53 lows near 40).
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Forecast for the Cascades of Lane County: Mostly cloudy tonight with just a slight (20%) chance of rain mainly North of highway 26, a slight (20%) chance of rain mainly North of the Santiam highway Monday, a slight (20%) chance of rain in the evening, a slight (20%) chance of rain Monday night mainly North of the Santiam highway, a mix of clouds and sun Tuesday, and mostly clear Tuesday night snow level 8,000 ft. tonight through Monday night ( 6,500 ft. Monday night North of the Santiam Pass), free air freezing level 10,000 ft. Tuesday and Tuesday night lows 30-26 highs 43-46. Mostly sunny Wednesday and Thursday with partly cloudy nights, a mix of clouds and sun Friday, then mostly cloudy with a slight (20%) chance of rain Friday night through Sunday free air freezing level 10,000 ft. Wednesday, 11,000 ft. Wednesday night and Thursday, 10,000 ft. Thursday night and Friday, snow level 8,000 ft. Friday night, then 7,000 ft. Saturday through Sunday highs 48-37 lows 26-33.
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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.