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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 South through California.  Another cold front push down from the North tonight 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 UNTIL NOON TODAY 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 slight (20%) chance of showers this AM, partly cloudy and colder tonight, mostly cloudy Monday, partly cloudy and colder Monday night highs 52-47 lows 34-26. 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 high 48 low 34)

Forecast for the South Oregon Coast including Coos Bay and North Bend:  Mostly cloudy with a slight (20%) chance of coastal showers today, and a slight (20%) chance of AM showers inland, mostly cloudy tonight, patchy AM fog, mostly cloudy Monday, partly cloudy in the evening, mostly cloudy Monday night and Tuesday AM with patchy AM fog, then partly cloudy Tuesday afternoon and night highs 55-49 lows 39-33. 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  a slight (20%) chance of  rain and snow showers this AM, (40%)chance of rain and snow showers this afternoon, partly cloudy with a slight (20%) chance of  snow showers and colder tonight, mostly cloudy with a  slight (20%) chance of snow showers Monday, partly cloudy Monday night, mostly sunny Tuesday, and mostly clear Tuesday night snow level 3,500 ft. today and tonight, falling to 3,000 ft. late tonight, 2,500 ft.  Monday,  free air freezing level 2,500 ft. falling to the surface late at night through Tuesday night highs 35-28 lows 25-18. Mostly sunny Wednesday and Thursday, partly cloudy Wednesday night, mostly clear Thursday night, then partly cloudy with a slight (20%) chance of rain Friday 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.