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Here is my new weekly weather quiz question. What is the “Pacific Decadal Oscillation?” Please remember to post your answer as a comment by clicking on “no comments /comments” in the upper right hand portion of this page under the caption, then add your comment. The first person to post the correct answer will win a week of free personalized weather forecasts tailored to your needs. The answer has to be a comment to win. An email answer will not count. Good Luck!
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An upper level trough of low pressure (shaded “U” shape) is sliding eastward through the Pacific Northwest. The next frontal system can be seen moving in with its warm front that already pushed in ahead and the cold front will follow behind it. Yet another frontal system will move in by mid week (position shown is Thursday) to continue the rain chances. Snow levels will fall to about 1,000 ft. Friday night and Saturday, but I don’t expect any snow to stick enough to pile up any accumulation on the valley floor.
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Advisories: NONE AT THIS TIME.
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Forecast for the Southern and lower Mid Willamette Valley including Eugene-Springfield and Albany-Corvallis: Cloudy with a good (50%) chance of rain late tonight (under 0.10 in. of rain possible), cloudy with a good (50%) chance of rain Tuesday (0.10 in. of rain possible), a (40%) chance of rain in the evening, rain late Tuesday night (0.25 in. of rain possible), AM rain Wednesday, showers in the afternoon, rain or snow showers and colder Wednesday night, mostly cloudy with AM rain or snow showers likely (60%), a good (50%) chance of rain or snow showers Thursday afternoon, then rain and snow showers likely (60%) Thursday night lows 43-30 highs 54-40. Mostly cloudy with a good (50%) chance of rain and snow showers Friday (snow level 1,000 ft.), a (40%) chance of rain Friday night and Saturday, a good (50%) chance of showers Saturday night, a (40%) chance of showers Sunday, then mostly cloudy with a (30%) chance of showers Sunday night and Monday highs 40-43 lows near 33. (seasonal averages high 46 low 34)
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Forecast for the Umpqua Basin including Roseburg: Mostly cloudy with a (30%) chance of showers late tonight (0.10 in. of rain possible), mostly cloudy with a slight (20%) chance of showers Tuesday, rain late Tuesday night and Wednesday AM, rain and snow and colder with isolated thunderstorms in the afternoon, rain and snow showers likely (70%) and colder with isolated thunderstorms Wednesday night (snow level 1,500 ft. falling to 600 ft. late at night), a (40%) chance of snow showers and isolated thunderstorms Thursday AM, a good (50%) chance of rain and snow showers and isolated thunderstorms in the afternoon, a good (50%) chance of rain and snow showers in the evening, rain and snow showers likely (60%) late Thursday night lows 44-32 highs 55-36. Mostly cloudy with rain and snow showers likely (60%) Friday, a (30%) chance of rain and snow showers Friday night and Saturday, rain and snow showers likely (60%) Saturday night, a good (50%) chance of rain and snow showers Sunday and Sunday night, then mostly cloudy with a slight (20%) chance of showers Monday highs 40-45 lows 32-38 cooling to 35 Sunday night. (seasonal averages high 49 low 36)
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Forecast for the South Oregon Coast including Coos Bay and North Bend: Mostly cloudy with a slight (20%) chance of showers tonight (0.25 in. of rain possible), a (30%) chance of showers Tuesday, rain late Tuesday night and breezy (wind: S 15-25 mph), AM coastal showers and isolated thunderstorms with rain in the afternoon and evening while inland rain and snow and isolated thunderstorms Wednesday afternoon and Wednesday night, rain and snow showers likely (60%) with isolated thunderstorms Thursday AM, rain and snow showers likely (70%) with isolated thunderstorms in the afternoon, a good (50%) chance of rain and snow showers in the evening, then mostly cloudy with rain and snow showers likely (60%) late Thursday night lows 47-36 highs 55-45. Mostly cloudy with showers likely (60%) Friday, a (40%) chance of showers Friday night and Saturday, showers likely (60%) Saturday night, mostly cloudy with a (40%) chance of showers Sunday and Sunday night, then mostly cloudy with a slight (20%) chance of showers Monday highs near 48 lows 36-40. (seasonal averages high 51 low 40)
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Forecast for the Cascades of Lane County: Cloudy with rain or snow this evening, rain and snow tonight (0.25 in. of rain possible, 1 in. of snow possible), AM clouds then a mix of clouds and sun in the afternoon with a good (50%) chance of rain or snow Tuesday (0.10 in. of rain possible), partly cloudy in the evening, mostly cloudy with a good (50%) chance of rain late Tuesday night (0.10 in. of rain possible), rain or snow Wednesday AM, snow showers and colder in the afternoon and breezy (wind: SW 15-25 mph gusts to 40 mph), snow showers and colder Wednesday night, mostly cloudy with AM snow showers likely (60%), a good (50%) chance of snow showers Thursday afternoon, then mostly cloudy with a good (50%) of snow showers Thursday night snow level 5,000 ft. tonight and Tuesday, 6,500 ft. Tuesday night, 4,500 ft. Wednesday AM, then at the surface Wednesday night through Thursday night lows 32-16 highs 45-26. Mostly cloudy with a good (50%) chance of snow showers Friday, a (40%) chance of snow Friday night, mostly cloudy with a (30%) chance of snow Saturday, a good (50%) chance of snow showers Saturday night, a (40%) chance of snow showers Sunday, a (30%) chance of snow showers Sunday night, then a mix of clouds and sun with a slight (20%) chance of snow showers Monday snow level at the surface Friday through Monday highs 25-32 lows 18-20.
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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.
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