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It’s Monday. Here is my weekly weather quiz question. What is “orographic lifting.” 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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Another upper level trough of low pressure has moved eastward over us. There will be a break today as the trough of low pressure pushed east of us and a weak high pressure ridge takes over. A new frontal system along with a new trough of low pressure will bring more wet weather for Christmas Day. Sorry, no white Christmas for the valleys only the mountains and foothills. Yet another weak frontal system will approach the Pacific Northwest Friday and try to produce more showers.
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Advisories: A WINTER STORM WATCH IS IN EFFECT FROM LATE TONIGHT THROUGH LATE TUESDAY NIGHT FOR THE NORTH OREGON CASCADES, THE CASCADES OF LANE COUNTY, THE UPPER HOOD RIVER VALLEY, THE WESTERN COLUMBIA RIVER GORGE, THE SOUTH CENTRAL AND SOUTH OREGON CASCADES, THE SISKIYOU MOUNTAINS, NORTHERN AND EASTERN KLAMATH COUNTY, AND WESTERN LAKE COUNTY.
A FLOOD WARNING CONTINUES FOR THE COQUILLE RIVER AT COQUILLE. MINOR FLOODING IS OCCURRING AS WAS EXPECTED. FOR MORE DETAILS GO TO THE NATIONAL WEATHER SERVICE FORECAST OFFICE AT PORTLAND FLOOD WARNING PAGE.
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Forecast for the Southern and lower Mid Willamette Valley including Eugene-Springfield and Albany-Corvallis: A mix of clouds and sun with a slight (20%) chance of showers this AM, mostly cloudy with rain late tonight (0.10 in. of rain possible), rain (0.50 in. of rain possible) Tuesday (Christmas Day) and Tuesday night (0.25 in. of rain possible), then mostly cloudy with showers Wednesday and showers likely (60%) Wednesday night highs near 45 lows 37-40 cooling to 35 Wednesday night. A mix of clouds and sun with a (40%) chance of showers Thursday, mostly cloudy with a slight (20%) chance of showers Thursday night through Friday night, then a mix of clouds and sun Saturday and Sunday with mostly cloudy skies Saturday night highs near 43 lows near 34. (seasonal averages high 45 low 33)
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Forecast for the Umpqua Basin including Roseburg: Mostly cloudy with a slight (20%) chance of rain or snow showers this AM (snow level 1,500 ft.), mostly cloudy this afternoon, rain and snow late tonight (under 0.10 in. of rain possible, 1-2 in. of snow possible, snow level 2,000 ft.), rain (0.30 in. of rain possible, AM snow level 2,500 ft.) Tuesday (Christmas Day), evening rain, showers late (0.20 in. of rain possible) Tuesday night, AM rain and snow showers, Wednesday, showers in the afternoon (snow level 2,500 ft. rising to 3,000 ft. in the afternoon) then rain and snow showers likely (70%) Wednesday night highs near 42-46 cooling to 43 Wednesday lows 36-38 cooling to 34 Wednesday night. Mostly cloudy with a (40%) chance of rain and snow showers Thursday,mostly cloudy Thursday night through Saturday, mostly cloudy with a slight (20%) chance of rain and snow showers Saturday night, then mostly cloudy Sunday highs 43-46 lows near 32. (seasonal averages high 47 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 AM showers today (snow level 2,000 ft.), cloudy with a slight (20%) chance of evening rain, coastal rain late with rain likely (70%) late tonight inland (0.10 in. of rain possible), mostly cloudy with rain (0.70 in. of rain possible) Tuesday (Christmas Day) and breezy (wind: S 15-25 mph gusts to 45 mph in the afternoon), evening rain, showers (0.45 in. of rain possible) late Tuesday night, showers Wednesday and in the evening, then mostly cloudy with showers likely (70%) late Wednesday night highs 46-50 cooling to near 45 Wednesday night lows 37-42 cooling to 38 Wednesday night. Mostly cloudy with a (40%) chance of showers Thursday, mostly cloudy Thursday night and Friday, a slight (20%) chance of showers Friday night through Saturday night, then just mostly cloudy Sunday highs near 48 lows 37-34. (seasonal averages high 51 low 40)
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Forecast for the Cascades of Lane County: Mostly cloudy with a good (50%) chance of snow showers this AM, a slight (20%) chance of snow showers this afternoon, a good (50%) chance of snow late tonight, mostly cloudy with rain and snow (0.75 in. of rain possible, 6-10 in. of snow possible) Tuesday (Christmas Day), rain and snow Tuesday night, mostly cloudy with rain and snow showers Wednesday, then snow showers likely (60%) Wednesday night snow level at the surface today, free air freezing level at the surface this evening, back to snow level at the surface late tonight, 2,500 ft. rising to 3,500 ft. Tuesday, 4,000 ft. Tuesday night, 3,000 ft. Wednesday, then 2,500 ft. Wednesday night highs 30-34 cooling to near 30 Wednesday night lows 24-27 cooling to 22 Wednesday night. Mostly cloudy with a good (50%) chance snow showers Thursday, a slight (20%) chance of snow showers Thursday night through Friday night, a mix of clouds and sun Saturday, mostly cloudy with a slight (20%) chance of snow showers Saturday night, then a mix of clouds and sun with a slight (20%) chance of snow showers Sunday snow level at the surface Thursday through Friday night, free air freezing level at the surface Saturday, then back to snow level at the surface Saturday night and Sunday highs near 32 lows 20-25.
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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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Get your local Eugene-Springfield news on-line at Eugene Daily News.com.
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