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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. A new frontal system along with a new trough of low pressure will bring more wet weather for today, Christmas Day. Sorry, no white Christmas for the valleys only the mountains and foothills. Yet another weak frontal system will approach the Pacific Northwest for the weekend and try to produce more showers.
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Advisories: A WINTER WEATHER ADVISORY IS IN EFFECT NOON TODAY FOR THE COAST RANGE OF NORTHWEST OREGON. A WINTER STORM WARNING IS IN EFFECT UNTIL 4 AM WEDNESDAY FOR THE WESTERN COLUMBIA RIVER GORGE, THE NORTH OREGON CASCADES, THE CASCADES OF LANE COUNTY, AND THE UPPER HOOD RIVER VALLEY. A WINTER STORM WARNING IN IN EFFECT UNTIL 4 PM TODAY FOR THE NORTH OREGON CASCADE FOOTHILLS. A WINTER WEATHER ADVISORY IS IN EFFECT UNTIL 10 PM WEDNESDAY FOR THE SOUTH CENTRAL AND SOUTH OREGON CASCADES, THE SISKIYOU MOUNTAINS, NORTHERN AND EASTERN KLAMATH COUNTY, WESTERN LAKE COUNTY, CENTRAL AND EASTERN LAKE COUNTY. A HIGH WIND WARNING IS IN EFFECT UNTIL 1 PM TODAY FOR THE SOUTH CENTRAL AND SOUTH OREGON COAST. A HIGH SURF ADVISORY IS IN EFFECT UNTIL 1 PM TODAY FOR THE SOUTH CENTRAL AND SOUTH OREGON COAST. A WINTER WEATHER ADVISORY IS IN EFFECT UNTIL 10 PM WEDNESDAY ABOVE 2,500 FT. FOR CENTRAL DOUGLAS COUNTY, EASTERN CURRY COUNTY, JOSEPHINE COUNTY, THE EASTERN DOUGLAS COUNTY FOOTHILLS, AND JACKSON COUNTY. A WINTER WEATHER ADVISORY IS IN EFFECT UNTIL 10 PM WEDNESDAY FOR THE SOUTH CENTRAL AND SOUTH 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: Mostly cloudy with rain (0.50 in. of rain possible) today (Christmas Day) and tonight (0.25 in. of rain possible), mostly cloudy with showers Wednesday (0.25 in. of rain possible), showers likely (60%) Wednesday night (0.15 in. of rain possible), a mix of clouds and sun with a (30%) chance of showers Thursday AM, a slight (20%) chance of showers (under 0.10 in. of rain possible) Thursday afternoon and evening, then mostly cloudy with patchy fog late Thursday night highs 46-42 lows 36-32. Patchy AM fog, mostly cloudy Friday through Saturday night, then a mix of clouds and sun Sunday and Monday with mostly cloudy skies Sunday night highs 40-43 lows 32-34. (seasonal averages high 45 low 33)
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Forecast for the Umpqua Basin including Roseburg: Mostly cloudy with AM rain and snow this AM, rain (0.35 in. of rain possible, 1 in. of snow possible, AM snow level 2,000 ft.) this afternoon (Christmas Day), evening rain, rain and snow late (0.20 in. of rain possible, 1 in. of snow possible, snow level 3,000 ft. falling to 2,500 ft. late) tonight, rain and snow showers Wednesday (0.25 in. of rain possible, 2 in. of snow possible, snow level 2,000 ft.), rain and snow showers in the evening (snow level 2,000 ft.), rain and snow showers likely (70%) Wednesday night (0.15 in. of rain possible, snow level 2,000 ft.), mostly cloudy with a (40%) chance of rain and snow showers Thursday, then just mostly cloudy Thursday night highs near 46-43 lows 39-33. Mostly cloudy Friday through Sunday, partly cloudy at night, then mostly cloudy Monday 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 rain this AM, a slight (20%) chance of coastal afternoon thunderstorms today (Christmas Day), rain inland (0.70 in. of rain possible), and windy (wind: S 25-40 mph decreasing to S 15-25 mph at the shore and S 15-25 mph inland this afternoon, S 15-25 mph inland), rain and a slight (20%) chance of thunderstorms at the shore, rain inland (0.45 in. of rain possible) tonight, showers Wednesday with a slight (20%) chance of AM thunderstorms (0.45 in. of rain possible), showers in the afternoon and in the evening, mostly cloudy with showers likely (70%) late Wednesday night (0.25 in. of rain possible), mostly cloudy with a (30%) chance of showers Thursday, then just mostly cloudy Thursday night highs 50-47 lows 42-36. Mostly cloudy with a slight (20%) chance of showers Friday and Friday night, mostly cloudy Saturday through Sunday, partly cloudy Sunday night, then just mostly cloudy Monday highs 48-52 lows near 35. (seasonal averages high 51 low 40)
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Forecast for the Cascades of Lane County: Mostly cloudy with rain and snow (0.75 in. of rain possible, 4-8 in. of snow possible) today (Christmas Day), rain and snow tonight (0.50 in. of rain possible, 3-6 in. of snow possible), mostly cloudy with snow showers Wednesday (0.30 in. of rain possible, 4-7 in. of snow possible), snow showers likely (70%) Wednesday night (0.15 in. of rain possible), a (40%) chance snow showers Thursday, mostly cloudy with a slight (20%) chance of snow showers Thursday evening, then mostly cloudy at night snow level 2,500 ft. rising to 3,500 ft. today, 3,000 ft. tonight, then at the surface Wednesday through Thursday night highs 33-28 lows 24-20. Mostly cloudy Friday and Friday night, mostly cloudy with a slight (20%) chance of snow showers Saturday and Saturday night, a mix of clouds and sun Sunday, then mostly cloudy Sunday night and Monday free air freezing level at the surface Friday and Friday night, snow level at the surface Saturday and Saturday night, 3,500 ft. Sunday, 4,500 ft. Sunday night, then 4,000 ft. Monday highs near 30 lows near 23.
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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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