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The jet stream shows a high pressure ridge ( “arch” shaped area) aiming the airflow toward the Pacific Northwest and an upper level low pressure area pushing South and Eastward through California.  Another cold front pushes down from the North tonight and Monday 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: NONE AT THIS TIME.

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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 tonight, mostly cloudy Monday AM, a mix of clouds and sun Monday afternoon, partly cloudy in the evening, mostly cloudy and colder Monday night, AM fog and freezing fog, a mix of clouds and sun Tuesday afternoon, mostly clear with patchy fog and freezing late Tuesday night and Wednesday AM, mostly sunny Wednesday afternoon, partly cloudy with patchy fog and freezing fog late at night and Thursday AM, a mix of clouds and sun Thursday afternoon, then partly cloudy Thursday night lows 35-24 Tuesday night warming to 30 Thursday night highs 48-54.  A mix of clouds and sun Friday, mostly cloudy Friday night, a mix of clouds and sun Saturday, partly cloudy Saturday night, then mostly cloudy with a slight (20%) chance of showers Sunday highs 55-49 lows near 28-38. (seasonal  averages high 48 low 34)

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Forecast for the Umpqua Basin including, Roseburg: Partly cloudy with patchy fog late tonight and early Monday AM, mostly sunny Monday afternoon, then patchy fog late Monday night and Tuesday AM, partly cloudy Tuesday afternoon, mostly clear Tuesday night with patchy fog late, patchy AM fog then partly cloudy Wednesday afternoon through Thursday night with patchy fog late at night and early AM lows 36-32 warming to 36 Thursday night highs 55-49 warming to 56 Thursday. Patchy fog then partly cloudy with a slight (20%) chance of showers Friday, mostly cloudy with a slight (20%) chance of showers Friday night, then partly cloudy Saturday through Sunday with a slight (20%) chance of showers highs 57-50 lows 37-33. (seasonal averages high 52 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 patchy fog late tonight and Monday AM, mostly sunny Monday afternoon, partly cloudy in the evening, mostly cloudy Monday night with patchy coastal fog, patchy fog Tuesday AM, then partly cloudy Tuesday afternoon and night, mostly cloudy Wednesday, then partly cloudy with patchy fog again late Wednesday night lows 39-33 warming to near 40 Wednesday night highs 50-55. Patchy AM and late night fog Thursday otherwise partly cloudy,  patchy AM fog Friday then partly cloudy with a slight (20%) chance of showers Friday afternoon and night, partly cloudy with a slight (20%) chance of showers Saturday through Sunday highs 62-49 lows 40-37. (seasonal averages high 54 low 40).

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Forecast for the Cascades of Lane County: Partly cloudy with a slight (20%) chance of  rain and snow showers this evening, a slight (20%) chance of snow showers tonight and Monday AM, a mix of clouds and sun Monday afternoon, partly cloudy Monday night, mostly sunny Tuesday through Thursday with mostly clear nights snow level 3,500 ft. falling to 2,000 ft. late tonight, at the surface Monday, free air freezing level at the surface late at night rising to 2,500 ft. Tuesday, 4,500 ft. rising to 6,000 ft. Tuesday night, 8,000 ft. Wednesday and Wednesday night, and rising to 9,000 ft. Thursday and Thursday night lows 21-17 warming to near 30 Thursday night highs 32-27 warming to 44 Thursday.  Partly cloudy with a slight (20%) chance of showers Friday, mostly cloudy with a slight (20%) chance of rain and snow showers Saturday through Sunday snow level 8,000 ft. Friday, 6,500 ft. Friday night, 3,500 ft. Saturday, and 4,500 ft. Saturday night and Sunday highs 48-37 lows 28-24.

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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.