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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, JACKSON COUNTY, 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: Patchy AM fog, mostly cloudy (some sun breaks) with a (30%) chance of rain this afternoon and this evening, a slight (20%) chance of rain late tonight through Sunday night highs near 55 lows 44-40. Mostly cloudy with a slight (20%) chance of rain Monday, partly cloudy with a slight (20%) chance of rain Monday night,  a mix of clouds and sun Tuesday, mostly clear Tuesday night, mostly sunny Wednesday, mostly clear again at night, and partly cloudy with a slight (20%) chance of showers Thursday highs 56-49 lows 39-34. (seasonal  averages high 49 low 34)

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Forecast for the Umpqua Basin including, Roseburg:  Patchy AM fog then partly cloudy today, mostly cloudy with a slight (20%) chance of showers this evening, partly cloudy with patchy fog late at night and early AM, mostly cloudy Saturday through Sunday, then mostly cloudy Sunday night with a slight (20%) chance of showers highs near 57 lows 45-38. Mostly cloudy with a slight (20%) chance of showers Monday, partly cloudy Monday night, mostly sunny Tuesday and Wednesday, mostly clear Tuesday night, partly cloudy Wednesday night, then partly cloudy with a slight (20%) chance of rain Thursday highs 55-59 cooling to near 53 Wednesday and Thursday lows near 36. (seasonal averages high 53 low 36)

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Forecast for the South Oregon Coast including Coos Bay and North Bend: Mostly cloudy this AM, partly cloudy with a slight (20%) chance of showers in the afternoon and this evening, mostly cloudy tonight, patchy fog late at night and early AM, mostly cloudy Saturday, mostly cloudy Saturday night with a slight (20%) chance of coastal showers late, mostly cloudy with a slight (20%) chance of showers Sunday, and mostly cloudy with a slight (20%) chance of showers Sunday night highs 58-55 lows 45-40.  Mostly cloudy with a slight (20%) chance of rain Monday, partly cloudy Monday night, mostly sunny Tuesday and Wednesday, mostly clear Tuesday night and Wednesday night, then partly cloudy with a slight (20%) chance of rain Thursday highs 59-52 lows near 40. (seasonal averages high 54 low 40).

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Forecast for the Cascades of Lane County: Mostly cloudy with a slight (20%) chance of rain today (0.25 in. of rain possible) and tonight (0.10 in. of rain possible),  rain likely (60%) Saturday (1 in. of snow possible, under 0.10 in. of rain possible),  mostly cloudy with a (40%) chance of rain Saturday night (0.25 in. of rain possible), then a (30%) chance of  rain  and snow Sunday and Sunday night snow level falling to 7,000 ft. today, 6,500 ft. tonight, 6,000 ft. Saturday, and 6,500 ft. Saturday night, then 6,000 ft. Sunday and Sunday night highs 50-42 lows 30-25. Mostly cloudy with a (30%) chance of rain Monday, a slight (20%) chance of rain and snow Monday night, a mix of clouds and sun Tuesday, partly cloudy Tuesday night, mostly sunny Wednesday, mostly clear Wednesday night, then partly cloudy with a slight (20%) chance of showers Thursday snow level 5,000 ft. Monday, 4,000 ft. Monday night,  free air freezing level 5,000 ft. Tuesday, 5,500 ft. Tuesday night, and 6,500 ft. Wednesday, 7,000 ft. Wednesday night, and a snow level of 6,500 ft. Thursday highs 44-40 lows 28-25.

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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.