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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. AN AIR STAGNATION ADVISORY IS IN EFFECT UNTIL 10 AM SATURDAY FOR THE KLAMATH BASIN, NORTHERN AND EASTERN KLAMATH COUNTY, AND CENTRAL, EASTERN, AND WESTERN LAKE 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 (30%) chance of rain this evening, a (30%) chance of showers late tonight,  mostly cloudy with a slight (20%) chance of showers Saturday AM, mostly cloudy Saturday afternoon,  a slight (20%) chance of  rain Saturday night through Sunday evening, a slight (20%) chance of rain late Sunday night, then partly cloudy with a slight (20%) chance of rain Monday and Monday night lows 45-37 highs 53-58-52.  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 50-47 lows 28-33. (seasonal  averages high 49 low 34)

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Forecast for the Umpqua Basin including, Roseburg:  Mostly cloudy with a slight (20%) chance of showers tonight,  patchy AM and late night fog then mostly cloudy Saturday through Sunday, partly cloudy in the evening, mostly cloudy Sunday night with a slight (20%) chance of showers late at night and early Monday AM, partly cloudy Monday afternoon and Monday night lows 45-37 highs 60-50. Partly cloudy and dry Tuesday through Friday highs 50-57 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: Mostly cloudy with a slight (20%) chance of showers tonight, patchy fog late at night and early AM, mostly cloudy Saturday and Saturday night, 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 Monday AM, and just partly cloudy Monday night lows 44-38 and back to 44 Monday highs 58-52. Partly cloudy and dry Tuesday 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 (30%) chance of rain this evening and a (40%) chance of showers tonight (1-3 in. of snow possible, 0.25 in. of rain possible), a (40%) chance of AM snow showers, a (30%) chance of rain and snow Saturday afternoon, a (30%) chance of rain Saturday night (0.25 in. of rain possible), a (30%) chance of rain Sunday (0.25 in. of rain possible), a good (50%) chance of rain Sunday night (1 in. of snow possible), partly cloudy with a (30%) chance of rain and snow Monday, and a (30%) chance of snow and a slight (20%) chance of rain Monday night snow level 6,000 ft. tonight, 5,000 ft. Saturday, 6,000 ft. Saturday night, 6,500 ft. Sunday, 6,000- ft. Sunday night, 4,000 ft. Monday, and 3,000 ft. Monday night lows 30-25 highs 36-46 cooling to 37 Friday highs 40-46 cooling to 38 Sunday. Partly cloudy with isolated 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 snow Thursday night, then partly cloudy with a slight (20%) chance of rain and snow Friday snow level at the surface Tuesday, free air freezing level  3,000 ft. Tuesday night, 3,500 ft. Wednesday, 4,500 ft. Wednesday night, 5,500 ft. Thursday, snow level 4,000 ft. Thursday night and Friday highs 36-46 cooling to 37 Friday lows 24-32.

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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.