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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.  A frontal system still offshore will slip in from the Northwest 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 through the rest of the week. Remember that, particularly this time of the year, often when it’s not raining it is usually fogging. The next major frontal system should move in between next Friday and Saturday.

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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: Mostly cloudy with a slight (20%) chance of light rain tonight (under 0.10 in of rain possible), patchy fog late tonight and Sunday AM, a mix of clouds and sun Sunday afternoon, mostly cloudy with a (30%) chance of evening rain, a (30%) chance of  showers Sunday night (under 0.10 in of rain possible), then partly cloudy with a slight (20%) chance of showers Monday and Monday night lows 40-44 cooling to 37 Monday night highs 60-53.  A mix of clouds and sun Tuesday, mostly clear Tuesday night, mostly sunny Wednesday, partly cloudy at night, a mix of clouds and sun Thursday and Friday, partly cloudy with patchy fog Thursday night, partly cloudy with a slight (20%) chance of rain Friday night, then mostly cloudy with a (40%) chance of rain Saturday highs 50-55 lows 28-36. (seasonal  averages high 49 low 34)

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Forecast for the Umpqua Basin including, Roseburg: Mostly cloudy with patchy fog late tonight and Sunday AM, partly cloudy Sunday afternoon and evening, mostly cloudy Sunday night with a slight (20%) chance of rain, mostly cloudy with patchy fog early Monday AM, partly cloudy Monday afternoon and evening,  mostly cloudy with a slight (20%) chance of showers late Monday night and Tuesday AM, mostly cloudy Tuesday afternoon, and partly cloudy Tuesday night lows 44-32 highs 63-52. Partly cloudy Wednesday through  Thursday night, just mostly cloudy Friday, then mostly cloudy with a slight (20%) chance of rain Friday night and Saturday highs 52-59 lows 32-37 cooling to 32 Friday night. (seasonal averages high 53 low 36)

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Forecast for the South Oregon Coast including Coos Bay and North Bend: Mostly cloudy with patchy fog late at night and Sunday AM, mostly cloudy Sunday afternoon, partly cloudy in the evening, mostly cloudy with a (30%) chance of showers Sunday night,  mostly cloudy with patchy fog Monday AM,  partly cloudy Monday afternoon and evening, then mostly cloudy with a slight (20%) chance of showers late Monday night lows 47-37 highs 58-52. Mostly cloudy with a slight (20%) chance of showers Tuesday AM, then partly cloudy Tuesday night  through Thursday night, mostly cloudy Friday, then mostly cloudy with a slight (20%) chance of rain Friday night and Saturday highs 53-57 cooling to near 50 Thursday warming to near 58 Friday and Saturday lows 35-40. (seasonal averages high 54 low 40).

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Forecast for the Cascades of Lane County: Mostly cloudy with a (30%) chance of  light rain tonight (0.50 in. of rain possible), a (30%) chance of rain Sunday (0.25 in. of rain possible) and breezy (wind: SW 5-15 mph increasing to SW 15-25 mph with gusts to 40 mph in the afternoon), evening rain likely (60%),  showers likely (60%) and breezy (wind: W 15-25 mph gusts to 45 mph) Sunday night (2 in. of snow possible, 0.25 in. of rain possible), mostly cloudy with a (30%) chance of AM rain and snow showers, rain and snow showers likely (60%) Monday afternoon and breezy (winds: w 15-25 mph gusts to 40 mph) and a (30%) chance of snow showers Monday night snow level 6,500 ft. tonight and Sunday, 6,000 ft. Sunday night, 3,500 ft. falling to 3,000 ft. Monday afternoon, and 2,500 ft. Monday night lows 30-22 highs 47-33. Partly cloudy with a slight (20%) chance of snow showers Tuesday, mostly clear Tuesday night, mostly sunny Wednesday  and Thursday, mostly clear Wednesday night, partly cloudy Thursday night, mostly cloudy with a slight (20%) chance of rain Friday,  a (40%) chance of snow and a slight (20%) chance of rain Friday night, then mostly cloudy with a (40%) chance of snow and rain Saturday free air freezing level at the surface Tuesday, 3,000 ft. Tuesday night, 3,500 ft. Wednesday, 6,000 ft. Wednesday night, 7,500 ft. Thursday, 7,000 ft. Thursday night, snow level 5,000 ft. Friday, and 3,500 ft. Friday night and Saturday highs 36-49 cooling to 44 Friday and 40 Saturday lows 20-33 cooling to 44 Friday and near 40 Saturday.

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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.