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The jet stream shows a high pressure ridge ( “arch” shaped area over the Pacific Northwest) that has kept us under a relatively calm weather pattern is moving Eastward away from us and a large trough of low pressure swinging in behind it. A frontal system pushed through and it will return as a warm front then other frontal systems will be following behind it (positions shown are for Wednesday). Remember that, particularly this time of the year, often when it’s not raining it is usually fogging.

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Advisories:  A HIGH WIND WARNING IS IN EFFECT FROM 4 AM UNTIL 10 PM MONDAY FOR THE SOUTH CENTRAL AND SOUTH OREGON COAST. A HIGH WIND WARNING IS IN EFFECT FROM 8 AM UNTIL 8 PM MONDAY FOR THE NORTH AND CENTRAL OREGON COAST AND THE NORTH AND CENTRAL COAST RANGE. A HIGH WIND WARNING IS IN EFFECT FROM 10 AM MONDAY UNTIL 4 PM TUESDAY FOR CENTRAL AND EASTERN LAKE COUNTY.  A WIND ADVISORY IS IN EFFECT FROM 4 AM UNTIL 10 PM MONDAY FOR JACKSON COUNTY.  A WIND ADVISORY IS IN EFFECT FROM 10 AM UNTIL 4 PM MONDAY FOR THE KLAMATH BASIN, NORTHERN AND EASTERN KLAMATH COUNTY, AND WESTERN LAKE COUNTY.  A WINTER STORM WATCH IS IN EFFECT FROM MONDAY AFTERNOON THROUGH TUESDAY AFTERNOON FOR THE NORTH OREGON CASCADES  INCLUDING THE CASCADES OF LANE COUNTY. A WINTER STORM WATCH IS IN EFFECT FROM MONDAY AFTERNOON THROUGH WEDNESDAY MORNING FOR THE SOUTH CENTRAL OREGON CASCADES AND SOUTH CASCADES AND THE SISKIYOU MOUNTAINS AND FROM TUESDAY MORNING UNTIL WEDNESDAY MORNING FOR  NORTHERN AND EASTERN KLAMATH COUNTY,  CENTRAL, EASTERN, AND WESTERN LAKE 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: Mostly cloudy with rain likely (60%) this evening (0.10 in. of rain possible) cloudy with rain redeveloping Monday (0.25 in. of rain possible) and windy (wind: S 20-30 mph),  rain (0.75 in. of rain possible) Monday night and windy (wind: S 20-30 mph shifting to SW 15 mph late), periods of rain Tuesday (0.50 in. of rain possible), and showers likely (60%) Tuesday night (0.25 in. of rain possible) lows 39-32 highs 54-44. Mostly cloudy with showers likely (60%) Wednesday, mostly cloudy with a (40%) chance of showers Wednesday night through Friday night, (40%) Friday night and Saturday, and (30%) Saturday night and Sunday highs 45-50 lows near 30. (seasonal  averages high 51 low 35)

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Forecast for the Umpqua Basin including, Roseburg: Mostly cloudy with a slight (20%) chance of rain this evening, mostly cloudy with a slight (20%) chance of AM rain Monday, rain likely (60%) in the afternoon and breezy (wind: S 15-25 mph gusts to 40 mph), rain  (snow level 3,500 ft. falling to 3,000 ft. late Monday night) and breezy (wind: S 15-25 mph gusts to 40 mph) Monday night, rain Tuesday (snow level 2,500 ft.), rain and snow Tuesday evening, rain and snow likely (60%) late Tuesday night (snow level 1,500 ft.) lows 40-33 highs 55-47. Mostly cloudy with snow and rain likely (60%) Wednesday AM, snow and rain showers Wednesday afternoon, rain and snow showers likely (60%) Wednesday night and Thursday, a good (50%) chance of rain and snow showers Thursday night through Sunday highs 45-48 cooling to near 45 Sunday lows 33-38. (seasonal averages high 55 low 36)

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Forecast for the South Oregon Coast including Coos Bay and North Bend: Mostly cloudy with a (40%) chance of rain this evening and breezy (wind: S 20-30 mph at the beaches S 10-20 mph inland, gusts to 40 mph late tonight), cloudy with a slight (20%) chance of rain Monday AM, then rain in the afternoon and windy (wind: S 25-35 mph at the shore, S 20-30 mph inland), rain and windy (wind: S 25-35 mph gusts to 50 mph shifting SW 20-25 mph gusts to 40 mph late at night) Monday night, mostly cloudy with rain (snow level 2,000 ft. in the afternoon) and breezy (wind: Sw  20-25 mph) Tuesday, coastal rain Tuesday night, evening rain then rain and snow  likely (60%) late Tuesday night inland lows 45-37 highs 56-47. Mostly cloudy with AM rain likely (60%) Wednesday, showers likely (60%) Wednesday evening, rain and snow showers likely (60%) late at night, showers likely (60%) Thursday,  mostly cloudy with a (40%) chance of showers Thursday night, a good (50%) chance of showers Friday through Saturday, showers likely (60%) Saturday night, a good (50%) chance of rain and snow showers Sunday AM, then a good (50%) chance of showers Sunday afternoon highs 47-52 lows 35-40. (seasonal averages high 55 low 41).

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Forecast for the Cascades of Lane County:  Mostly cloudy rain likely this evening (2 in.. of snow possible, 0.10 in. of rain possible),  cloudy with rain redeveloping Monday (2-5 in. of snow possible) and windy (wind: S 15-20 mph increasing to S 20-30 mph gusts to 45 mph higher elevations),  snow and rain Monday night (5-10 in. of snow possible) and windy (wind: S 20-30 mph), periods of snow Tuesday (5-9 in. of snow possible), snow showers in the evening, and snow showers likely (60%) Tuesday night (3-6 in. of snow possible) snow level 5,500 ft. tonight, 4,500 ft. Monday afternoon, 3,500 ft.  Monday night,  2,500 ft. Tuesday, and at the surface Tuesday night lows 30-23 highs 40-33. Mostly cloudy with a snow showers likely (60%) Wednesday through Thursday, then mostly cloudy with a good (50%) chance of snow showers Thursday night through Sunday snow level at the surface Wednesday and Wednesday night, 2,500 ft. Thursday, and down to the surface through, then 3,000 ft. Saturday through Sunday highs 30-38 lows 20-24.

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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.