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The jet stream shows a high pressure ridge (“arch” shape) has been aiming the airflow straight South toward the Pacific Northwest. The ridge is slowly moving Eastward which will allow our temperatures to moderate a bit. A weak disturbance will slip in bringing at least a slight chance of rain. Yet another ridge will start to build in and that will keep us under a relatively calm weather pattern. Remember that, particularly this time of the year, often when it’s not raining it is usually fogging.

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Advisories:  AN AIR STAGNATION ADVISORY IS IN EFFECT UNTIL 10 AM MONDAY FOR CENTRAL DOUGLAS COUNTY INCLUDING ROSEBURG, 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: Patchy AM fog, mostly cloudy with a slight (20%) chance of sprinkles or light rain this afternoon (under 0.10 in of rain possible),  a (30%) chance of showers this evening,  a slight (20%) chance of  rain tonight (under 0.10 in of rain possible), AM fog, mostly cloudy with a slight (20%) chance of AM rain, partly cloudy with a slight (20%) chance of showers Sunday afternoon, mostly cloudy with a (30%) chance of showers Sunday night, then partly cloudy with a slight (20%) chance of rain Monday and Monday night highs 53-58-52 lows 42-37.  A mix of clouds and sun Tuesday, partly cloudy Tuesday night, mostly sunny Wednesday, partly cloudy at night, a mix of clouds and sun Thursday, partly cloudy Thursday night, and partly cloudy with a slight (20%) chance of rain Friday highs 50-53 lows 28-33. (seasonal  averages high 49 low 34)

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Forecast for the Umpqua Basin including, Roseburg: Patchy AM fog,  mostly cloudy with a slight chance of AM rain today and a slight (20%) chance of showers this afternoon, mostly cloudy with patchy fog late tonight and Sunday AM, mostly cloudy Sunday afternoon, partly cloudy in the evening, mostly cloudy Sunday night with a slight (20%) chance of showers late at night, patchy fog early Monday AM, partly cloudy Monday afternoon and evening with a slight (20%) chance of evening showers, then a slight (20%) chance of rain and snow showers late Monday night highs 60-54 lows 38-34. Mostly cloudy with a slight (20%) chance of showers Tuesday, then just partly cloudy and dry Tuesday night through Friday highs 53-57 lows 29-34. (seasonal averages high 53 low 36)

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Forecast for the South Oregon Coast including Coos Bay and North Bend: Patchy fog early this AM, mostly cloudy with a slight (20%) chance of rain this AM,  mostly cloudy tonight with a slight (20%) chance of evening coastal showers, patchy fog again late at night and Sunday AM, mostly cloudy Sunday afternoon, partly cloudy in the evening, mostly cloudy with a slight (20%) chance of showers late Sunday night and a slight (20%) chance of coastal showers Monday AM, and partly cloudy with a slight (20%) chance of showers late Monday night highs 52-56 lows near 38. Mostly cloudy with a slight (20%) chance of showers Tuesday, then partly cloudy Tuesday night  through Friday highs 52-58 lows 34-38. (seasonal averages high 54 low 40).

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Forecast for the Cascades of Lane County: Mostly cloudy with a light rain or snow likely (60%) today (1-3 in. of snow possible, 0.25 in. of rain possible), a (30%) chance of rain tonight (0.50 in. of rain possible), a (30%) chance of AM rain, a (30%) chance of showers in the afternoon (0.25 in. of rain possible) and breezy (wind: SW 5-15 mph increasing to 15-25 mph in the afternoon) Sunday, showers likely (60%) and breezy (wind: W 20-30 mph gusts to 50 mph higher elevations) Sunday night (2 in. of snow possible, 0.25 in. of rain possible), mostly cloudy and windy (winds: w 15-25 mph gusts to 45 mph) with rain and snow showers likely (60%) Monday, and a (30%) chance of snow showers Monday night snow level 5,000 ft. today, 6,500 ft. tonight, 6,500 ft. Sunday, 7,000 ft. Sunday night, 4,000 ft. Monday, and at the surface Monday night highs 40-46 cooling to 33 Monday lows 30-24. Partly cloudy with a slight (20%) chance of snow showers Tuesday, mostly clear Tuesday night, mostly sunny Wednesday, mostly clear Wednesday night, a mix of clouds and sun Thursday, partly cloudy with a slight (20%) chance of rain Thursday night, then mostly cloudy with a slight (20%) chance of rain Friday snow level at the surface Tuesday, free air freezing level 3,000 ft. Tuesday night, 3,500 ft. Wednesday, 6,000 ft. Wednesday night, 4,500 ft. Thursday, snow level 4,500 ft. Thursday night and 5,000 ft. Friday highs 35-49 cooling to 42 Friday lows 24-30.

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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.