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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 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: Patchy fog this AM, a mix of clouds and sun this afternoon,  increasing clouds with a (30%) chance of  rain tonight (under 0.10 in of rain possible), then a mix of clouds and sun with a slight (20%) chance of showers Monday AM, a (30%) chance of showers in the afternoon, and partly cloudy with a slight (20%) chance of showers Monday night highs 60-53 lows 42-37.  A mix of clouds and sun Tuesday with a slight (20%) chance of AM showers, 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: Partly cloudy this afternoon and evening, mostly cloudy tonight with a slight (20%) chance of rain, mostly cloudy with patchy fog early Monday AM, mostly cloudy with a slight (20%) chance of showers Monday afternoon (snow level 3,500 ft.) and evening,  mostly cloudy with a slight (20%) chance of rain and snow showers late Monday night (snow level 2,500 ft. falling to 2,000 ft. late at night) and Tuesday AM, mostly cloudy Tuesday afternoon (snow level 2,000 ft.) with a slight (20%) chance of showers, and partly cloudy Tuesday night with patchy fog late highs 63-52 lows 37-32. 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  this afternoon, partly cloudy in the evening, mostly cloudy with a (30%) chance of showers tonight, mostly cloudy with patchy fog Monday AM, partly cloudy Monday afternoon with a slight (20%) chance of showers,  then mostly cloudy with a slight (20%) chance of showers late Monday night highs 58-52 lows 42-37. Mostly cloudy with a slight (20%) chance of showers Tuesday, then partly cloudy Tuesday night through Wednesday evening, mostly cloudy Wednesday night with patchy fog late, mostly cloudy Thursday, partly cloudy Thursday night, mostly cloudy Friday, then mostly cloudy with a slight (20%) chance of rain Friday night and a (30%) chance 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 or drizzle this AM, mostly cloudy in the afternoon  (0.25 in. of rain possible) and breezy (wind: SW 5-15 mph gusts to 30 mph higher elevations increasing to SW 15-25 mph with gusts to 40 mph in the afternoon), a (40%) chance of evening rain,  rain likely (60%) and breezy (wind: W 15-25 mph gusts to 45 mph) late tonight (1-4 in. of snow possible, 0.25 in. of rain possible), mostly cloudy with rain and snow showers likely (60%) Monday (3-6 in. of snow possible),  and breezy (winds: w 15-25 mph gusts to 40 mph), a (30%) chance of snow showers Monday night snow level 7,000 ft. today, falling to 5,000 ft. late tonight,  3,000 ft. Monday, and 2,500 ft. Monday night highs 47-33 lows 27-22. 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 snow level at the surface Tuesday, free air freezing level 3,500 ft. Tuesday night, 4,000 ft. Wednesday, 8,000 ft. Wednesday night, 7,500 ft. Thursday and Thursday night, snow level 6,500 ft. Friday, 4,500 ft. Friday night, and 4,000 ft. 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.