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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:  A WINTER WEATHER ADVISORY IS IN EFFECT  FROM 10 PM TONIGHT UNTIL 4 AM TUESDAY FOR THE NORTH OREGON CASCADES, BUT NOT INCLUDING THE CASCADES OF LANE 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: Partly cloudy with a slight (20%) chance of  rain this evening, a slight (20%) chance of showers late tonight (under 0.10 in of rain possible), a mix of clouds and sun with a slight (20%) chance of showers Monday AM, a (30%) chance of showers in the afternoon, partly cloudy with a slight (20%) chance of showers Monday night, a slight (20%) chance of AM showers Tuesday, a mix of clouds and sun Tuesday afternoon, mostly clear Tuesday night, mostly sunny Wednesday, and partly cloudy Wednesday night lows 43-28 highs near 50. A mix of clouds and sun Thursday, partly cloudy with patchy fog Thursday night, partly cloudy with a (30%) chance of rain Friday and Friday night, then mostly cloudy with a (40%) chance of rain Saturday through Sunday highs 53-57 cooling to 48 Saturday and back to 52 Sunday lows 32-39-35. (seasonal  averages high 49 low 34)

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Forecast for the Umpqua Basin including, Roseburg: Partly cloudy this evening, mostly cloudy tonight with a slight (20%) chance of rain and patchy fog late, 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 lows 40-30 highs 52-56. Partly cloudy with areas of fog Wednesday and Wednesday night, partly cloudy Thursday and Thursday night, just mostly cloudy Friday, then mostly cloudy with a slight (20%) chance of rain Friday night, rain likely (60%) Saturday, then mostly cloudy with a good (50%) chance of rain Saturday night and (40%) Sunday highs 55-59 cooling to near 50 Saturday and back to near 55 Sunday lows near 35. (seasonal averages high 53 low 36)

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Forecast for the South Oregon Coast including Coos Bay and North Bend: Partly cloudy this evening, mostly cloudy with a slight (20%) chance of rain late tonight, mostly cloudy with patchy fog Monday AM, mostly cloudy with a slight (20%) chance of showers Monday afternoon through Tuesday, partly cloudy Tuesday night and Wednesday, then partly cloudy Wednesday evening, mostly cloudy with areas of fog late Wednesday night lows 44-35 highs 50-54. Sunny Thursday, partly cloudy Thursday night, mostly cloudy Friday, mostly cloudy Friday, mostly cloudy with a (30%) chance of rain Friday night , rain likely (60%) Saturday, then mostly cloudy with a good (50%) chance of rain Saturday night and (40%) Sunday highs 58-50  lows near 40. (seasonal averages high 54 low 40).

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Forecast for the Cascades of Lane County: Partly cloudy this evening,  mostly cloudy with  a (30%) chance of rain or snow showers late tonight (1 -3 in. of snow possible), mostly cloudy with a (30%) chance of AM rain and snow showers Monday, a (30%) chance of snow showers in the afternoon (1-3 in. of snow possible), a (40%) chance of snow showers and colder Monday night (1-3 in. of snow possible), a (30%) chance of snow showers Tuesday AM, a mix of clouds and sun with a slight (20%) chance of snow Tuesday afternoon, mostly cloudy Tuesday night  snow level 7,000 ft.  falling to 5,000 ft. late tonight, 4,000 ft. falling to 3,000 ft. Monday, 2,500 ft. Monday evening through Tuesday, then a free air freezing level 3,500 ft. Tuesday night lows 27-20 highs 32-37. 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, then mostly cloudy with a good (50%) chance of snow Saturday night and Sunday snow level at the surface Tuesday, free air freezing level 5,000 ft. Wednesday, 9,000 ft. Wednesday night through Thursday night, snow level  7,000 ft. Friday, 5,000 ft. Friday night,  4,000 ft. Saturday, and 2,500 ft. Saturday night and Sunday highs 42-50 cooling to 42 Friday and 35 Saturday then 40 Sunday lows 30-22.

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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.