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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) has moved past us and now cold high pressure (shaded “Arch shape”) will spread colder air into the Pacific Northwest. The next frontal system can be seen moving in with its warm front ahead and the cold front will follow behind it. Yet another frontal system will move in by mid week (position shown is Friday) 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. We’ll have to keep an eye on that situation.
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Advisories: A WINTER WEATHER ADVISORY IS N EFFECT FROM 7 AM WEDNESDAY UNTIL MIDNIGHT WEDNESDAY NIGHT FOR THE NORTHERN OREGON CASCADES (NOT INCLUDING THE CASCADES IN LANE COUTY). A WINTER WEATHER ADVISORY IS IN EFFECT FROM 4 PM WEDNESDAY UNTIL 4 AM THURSDAY ABOVE 1,000 FT. FOR THE SOUTH CENTRAL AND SOUTH OREGON COAST. A WINTER WEATHER ADVISORY IS IN EFFECT FROM 1 PM WEDNESDAY UNTIL 4 AM FRIDAY ABOVE 1,000 FT. FOR CENTRAL DOUGLAS COUNTY, EASTERN CURRY COUNTY, AND JOSEPHINE COUNTY, JACKSON COUNTY. A WINTER WEATHER ADVISORY IS IN EFFECT FROM 10 AM WEDNESDAY UNTIL 4 AM THURSDAY FOR THE EASTERN DOUGLAS COUNTY FOOTHILLS, THE SOUTH CENTRAL OREGON CASCADES, THE SOUTH OREGON CASCADES, AND THE SISKIYOU MOUNTAINS. A WIND ADVISORY IS IN EFFECT FROM 1 AM UNTIL 1 PM WEDNESDAY FOR NORTHERN AND EASTERN KLAMATH COUNTY, CENTRAL, EASTERN, AND WESTERN LAKE COUNTY.
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Forecast for the Southern and lower Mid Willamette Valley including Eugene-Springfield and Albany-Corvallis: Mostly cloudy with a good (50%) chance of rain late tonight (0.10 in. of rain possible) and breezy (wind: S 10-15 mph increasing to S 15-25 mph late), rain Wednesday (0.50 in. of rain possible) and breezy (wind: SW 15-25 mph shifting W 10-15 mph in the afternoon), evening showers, rain and snow showers and colder Wednesday night (0.15 in. of rain possible, 1 in. of snow possible, snow level 1,000 ft.), mostly cloudy with a good (50%) chance of rain or snow showers Thursday (under 0.01 in. of rain possible), a (40%) chance of rain and snow showers Thursday night (snow showers 1,000 ft.), mostly cloudy with a good (50%) chance of AM rain and snow showers Friday, a good (50%) chance of afternoon showers, then a (40%) chance of rain Friday night lows 42-30 highs 45-38. Mostly cloudy with a (40%) chance of rain Saturday, a good (50%) chance of showers Saturday night and Sunday, a (30%) chance of showers Sunday night, a (40%) chance of showers Monday, mostly cloudy with a slight (20%) chance of showers Monday night, then a mix of clouds and sun with a (30%) chance of showers Tuesday highs 44-46 lows near 34. (seasonal averages high 46 low 34)
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Forecast for the Umpqua Basin including Roseburg: Mostly cloudy with a (30%) chance of rain late tonight and breezy (wind: S 15-25 mph), AM rain, rain and snow showers Wednesday afternoon (0.30 in. of rain possible, 1-2 in. of snow possible) and breezy (wind: SW 15-25 mph decreasing to SW 10-15 mph in the afternoon), rain and snow showers with isolated thunderstorms in the evening, rain and snow showers late Wednesday night (0.25 in. of rain possible, 1 in. of snow possible lower elevations and 1-2 in. of snow possible above 1,500 ft., snow level 1,500 ft. falling to 400 ft. late at night), rain and snow showers likely (60%) Thursday (under 0.10 in. of rain possible), a (40%) chance of rain and snow showers Thursday night (under 0.10 in. of rain possible, snow level 600 ft.), rain and snow showers likely (60%) Friday, then mostly cloudy with a (40%) chance of rain and snow showers Friday night lows 42-32 highs 44-40 warming to 43 Friday. Mostly cloudy with a (40%) chance of rain and snow Saturday, rain and snow showers likely (60%) Saturday night, a good (50%) chance of rain and snow showers Sunday, a slight (20%) chance of showers Sunday night, mostly cloudy with patchy AM fog and freezing fog with a slight (20%) chance of showers Monday AM, partly cloudy in the afternoon, mostly cloudy Monday night, patchy AM fog, then just mostly cloudy Tuesday highs 44-49 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 coastal rain likely (60%) late tonight while a good (50%) chance of rain inland late tonight (0.10 in. of rain possible) and windy (wind: S 20-30 mph gusts to 45 mph), AM rain Wednesday, coastal showers and isolated thunderstorms in the afternoon and evening while inland afternoon showers (0.65 in. of rain possible, snow level 2,000 ft.), coastal showers likely (60%) with isolated thunderstorms late Wednesday night while rain and snow showers and isolated thunderstorms inland at night (0.15 in. of rain possible, 1-2 in. of snow possible, snow level 1,500 ft. falling to 1,000 ft. late), coastal showers likely (60%) with isolated thunderstorms Thursday AM and showers likely (60%) in the afternoon while rain and snow showers likely (70%) with isolated thunderstorms inland in the afternoon (0.10 in. of rain possible, snow level 900 ft.), a good (50%) chance of coastal showers and a good (50%) chance of rain and snow showers inland Thursday night, rain and snow showers likely (60%) Friday AM, showers likely (60%) in the afternoon, then mostly cloudy with a (40%) chance of showers Friday night lows 45-36 highs 47-44 warming to 39 Friday. Mostly cloudy with a good (50%) chance of showers Saturday, showers likely (70%) Saturday night, a (40%) chance of showers Sunday, a slight (20%) chance of rain Sunday night, patchy AM fog, mostly cloudy with a slight (20%) chance of showers Monday, mostly cloudy at night, then patchy AM fog with mostly cloudy skies Tuesday highs 47-52 lows 37-40. (seasonal averages high 51 low 40)
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Forecast for the Cascades of Lane County: Partly cloudy this evening, mostly cloudy with a slight (20%) chance of rain late tonight (0.10 in. of rain possible) and breezy (wind: SW 15-25 mph gusts to 40 mph), rain or snow Wednesday (0.50 in. of rain possible, 2-5 in. of snow possible)and breezy (wind: SW 15-25 mph gusts to 45 mph, shifting W 10-15 mph gusts to 35 mph in the afternoon), snow showers (1-3 in. of snow possible) and colder Wednesday night, a good (50%) chance of snow showers Thursday and Thursday night, a good (50%) of snow showers Friday AM, snow showers likely (60%) in the afternoon, then mostly cloudy with a (40%) chance of snow Friday night snow level 7,000 ft. tonight, 5,500 ft. falling to 2,500 ft. Wednesday afternoon,then at the surface Wednesday night through Friday night lows 28-15 highs 32-26. Mostly cloudy with a (40%) chance of snow Saturday, a good (50%) chance of snow showers Saturday night and Sunday, a (40%) chance of snow showers Sunday night, a mix of clouds and sun with a slight (20%) chance of rain and snow showers Monday, mostly cloudy with slight (20%) chance of rain and snow showers Monday night, then a mix of clouds and sun with a slight (20%) chance of rain and snow showers Tuesday snow level at the surface Saturday through Sunday night, 2,500 ft. Monday, 4,500 ft. Monday night, then 5,500 ft. Tuesday highs 29-34 lows 20-22.
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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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