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The jet stream shows a high pressure ridge ( “arch” shaped area) aiming the airflow toward the Pacific Northwest and a closed low pressure area headed to California. The  computer models indicate a wet weather pattern will begin as a frontal system moves in from the west. Another cold front (see last graphic) will try to push down from the North Sunday night and Monday with the potential of bringing some cold Arctic air with it. Remember that, particularly this time of the year, when it’s not raining it is usually fogging and we’ve had some pretty dense fog lately.

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Advisories: A HIGH SURF ADVISORY IS IN EFFECT FROM MIDNIGHT TONIGHT UNTIL NOON SUNDAY FOR THE SOUTH OREGON COAST (CURRY COUNTY COAST).

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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 (40%) chance of rain tonight, mostly cloudy with a slight (20%) chance of showers Sunday AM, partly cloudy with a slight (20%) chance of showers Sunday night, mostly cloudy with a slight (20%) chance of showers Monday, partly cloudy and colder Monday night lows 39-26 highs 52-47. Mostly sunny Tuesday, partly cloudy Tuesday night, a mix of clouds and sun Wednesday through Saturday with partly cloudy nights highs 48-54 lows near 25-36. (seasonal  averages highs 48 low 34)

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Forecast for the Umpqua Basin including, Roseburg: Cloudy with a good (50%) chance of rain this evening, rain likely (60%)  late tonight (snow level 3,500 ft. late),  mostly cloudy with a slight (20%) chance of showers Sunday AM, just mostly cloudy Sunday night, mostly cloudy with patchy AM fog Monday,  a slight (20%) chance of showers Monday, partly cloudy with a slight (20%) chance of evening showers, then patchy fog late Monday night and Tuesday AM, partly cloudy Tuesday afternoon, then mostly clear Tuesday night with patchy fog and freezing fog lows 38-28 high 38-33. Mostly sunny Wednesday, partly cloudy with patchy fog and freezing fog Wednesday night and Thursday, mostly cloudy with areas of patchy fog Thursday night and Friday, partly cloudy with a slight (20%) chance of showers Friday night and Saturday highs 50-55 lows 32-39. (seasonal averages high 52 low 36)

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Forecast for the South Oregon Coast including Coos Bay and North Bend:  Mostly cloudy with rain likely (60%) tonight, a slight (20%) chance of showers Sunday, and a slight (20%) chance of AM showers inland, mostly cloudy Sunday night, patchy AM fog, mostly cloudy with a slight (20%) chance of showers Monday, partly cloudy with a slight chance of evening showers, mostly cloudy Monday night and Tuesday AM with patchy AM fog, then partly cloudy Tuesday afternoon and night lows 42-30 highs 55-49. Partly cloudy Wednesday, partly cloudy with patchy fog Wednesday night through Friday, then partly cloudy with a slight (20%) chance of showers Friday night and Saturday highs near 54 lows near 39. (seasonal averages high 54 low 40).

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Forecast for the Cascades of Lane County: Mostly cloudy with a  good (50%) chance of rain and snow tonight, a (40%) chance of  rain and snow showers Sunday, partly cloudy with a slight (20%) chance of rain and snow showers Sunday night, mostly cloudy with a  slight (20%) chance of snow showers Monday (breezy near Mt. Hood), partly cloudy Monday night (breezy near Mt. Hood), mostly sunny Tuesday (windy near Mt. Hood), and mostly clear Tuesday night snow level 4,000 ft. tonight, 3,500 ft. Sunday, 3,000 ft. Sunday night (1,500 ft. near Mt. Hood), at the surface Monday through Tuesday night lows 28-20 highs 35-28. Mostly sunny Wednesday and Thursday, partly cloudy Wednesday night, mostly clear Thursday night, then partly cloudy with a slight (20%) chance of rain Wednesday through Saturday free air freezing level 4,500 ft. Wednesday, 6,000 ft. Wednesday night, and 7,000 ft. Thursday,  7,500 ft. Thursday night, 6,000 ft. Friday, 6,500 ft. Friday night, and 4,500 ft. Saturday highs 40-47 lows 26-32.

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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.