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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: Rain today (0.10 in. of rain possible), rain likely (60%) this evening, a good (50%) chance of rain late tonight (0.10 in. of rain possible), cloudy with a good (50%) chance of rain Tuesday AM, a slight (20%) chance of rain in the afternoon and evening, rain Tuesday night and Wednesday AM, showers in the afternoon and evening and cooler, then rain or snow showers Wednesday night highs 50-54 cooling to 44 Wednesday lows 43-32. Mostly cloudy with a good (50%) chance of rain and snow showers Thursday through Friday, a (40%) chance of rain Friday night (snow level 1,000 ft.), a (40%) chance of showers Saturday (snow level 1,000 ft.), then mostly cloudy with a good (50%) chance of showers Saturday night and Sunday highs 42-40 warming to 45 Sunday lows 29-35. (seasonal averages high 46 low 34)
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Forecast for the Umpqua Basin including Roseburg: Mostly cloudy with rain today (0.15 in of rain possible), showers this evening, a (40%) chance of showers late tonight (0.10 in. of rain possible), mostly cloudy with a (30%) chance of showers Tuesday, rain late Tuesday night (snow level 3,500 ft. late), rain and snow showers Wednesday AM, rain and snow showers and colder with a slight (20%) chance of thunderstorms in the afternoon (snow level 1,500 ft.), then rain and snow showers likely (70%) and colder Wednesday night with a slight (20%) chance of thunderstorms highs 47-54 cooling to near 44 Wednesday lows 43-32. Mostly cloudy with a (40%) chance of rain and snow showers and a slight (20%) chance of thunderstorms Thursday, a good (50%) chance of rain and snow showers Thursday night and Friday, a (30%) chance of rain and snow showers Friday night and Saturday, then a good (50%) chance of rain and snow showers Saturday night and Sunday highs 40-45 lows 32-36. (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 rain today (0.40 in. of rain possible), evening coastal showers likely (60%) while evening showers inland and a good (50%) chance of showers late tonight (0.25 in. of rain possible), mostly cloudy with a (30%) chance of showers Tuesday, rain late Tuesday night and breezy (wind: S 15-25 mph), AM coastal showers with showers and a slight (20%) chance of thunderstorms in the afternoon while AM rain and snow showers inland with showers, snow showers and a slight (20%) chance of thunderstorms Wednesday afternoon (snow level 1,500 ft.), showers and a slight (20%) chance of rain in the evening, then rain and snow showers with a slight (20%) chance of thunderstorms late Wednesday night highs 52-55 cooling to 44 Wednesday lows 47-37. Mostly cloudy with a good (50%) chance of rain and snow showers and a slight (20%) chance of thunderstorms Thursday, then mostly cloudy with showers likely (60%) Thursday night and Friday, then mostly cloudy with a (40%) chance of showers Friday night and Saturday, then a good (50%) chance of showers Sunday highs 42-49 lows 36-40. (seasonal averages high 51 low 40)
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Forecast for the Cascades of Lane County: Mostly cloudy with rain this afternoon (0.25 in. of rain possible), rain and snow tonight (0.25 in. of rain possible, 1 in. of snow possible), mostly cloudy with a good (50%) chance of rain or snow Tuesday and breezy (wind: SW 15-25 mph gusts to 40 mph), partly cloudy with a slight (20%) chance of evening rain, rain likely (60%) late Tuesday night and breezy (wind: SW 15-25 mph gusts to 40 mph late at night), rain and snow Wednesday AM, snow showers and colder in the afternoon, then mostly cloudy with snow showers Wednesday night snow level 6,000 ft. today, 5,500 ft. tonight, 5,000 ft. Tuesday, 6,500 ft. Tuesday night, 3,500 ft. falling to 2,500 ft. Wednesday, then at the surface Wednesday night highs 36-45 cooling to near 30 Wednesday lows 32-20. Mostly cloudy with a good (50%) of snow showers Thursday through Friday, a (30%) chance of snow Friday night, a good (50%) chance of snow showers Saturday through Sunday snow level at the surface Thursday through Saturday, 2,500 ft. Saturday night, then at the surface Sunday highs 23-28 lows 15-24.
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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.
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