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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 (shaded “U” shape) is moving through the Pacific Northwest and pulling away from us to the east. A high pressure ridge (“Arch” shape shaded and with blue arrows) is falling in behind the low and will dry us out and show us that illusive bright orb called the sun. It won’t be until the middle to the end of next week that a frontal system could bring back the cloudy and rainy weather.
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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: Mostly cloudy with a (30%) chance of AM showers, a slight (20%) chance of showers (under 0.10 in. of rain possible) this afternoon, mostly cloudy with patchy fog late tonight, Friday AM fog, mostly cloudy with a slight (20%) chance of rain in the afternoon (0.15 in. of rain possible), mostly cloudy with a slight (20%) chance of rain Friday night (0.30 in. of rain possible) with patchy fog late, then just mostly cloudy with patchy AM and late night fog Saturday and Saturday night highs 45-39 lows near 34. Patchy AM fog, partly cloudy Sunday, mostly cloudy with patchy fog late at night and Monday AM, a mix of clouds and sun Monday afternoon, partly cloudy at night, mostly cloudy with a slight (20%) chance of rain Tuesday (New Year’s Day) and Tuesday night, then mostly cloudy with a (30%) chance of rain Wednesday highs 40-44 lows 30-36. (seasonal averages high 45 low 33)
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Forecast for the Umpqua Basin including Roseburg: Mostly cloudy with a (30%) chance of rain and snow showers today (under 0.10 in. of rain possible, snow level 2,500 ft.), mostly cloudy with areas of fog tonight, mostly cloudy with a slight (20%) chance of rain and snow Friday afternoon (under 0.10 in. of rain possible, snow level 2,000 ft.), mostly cloudy with a slight (20%) chance of rain and snow Friday night (0.10 in. of rain possible, snow level 2,500 ft.), then just mostly cloudy Saturday and Saturday night highs 47-40 lows 34-32. Partly cloudy Sunday and Sunday night, mostly cloudy Monday, partly cloudy Monday night, mostly cloudy with a slight (20%) chance of rain Tuesday (New Year’s Day), mostly cloudy with a (30%) chance of rain Tuesday night, then mostly cloudy with a slight (20%) chance of rain Wednesday highs 42-45 lows 32-36. (seasonal averages high 48 low 36)
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Forecast for the South Oregon Coast including Coos Bay and North Bend: Mostly cloudy with a (30%) chance of scattered coastal showers today while a (30%) chance of scattered AM showers inland then a (30%) chance of afternoon showers (under 0.10 in. of rain possible, snow level 2,000 ft.), mostly cloudy with patchy fog late tonight, cloudy with a slight (20%) chance of rain Friday afternoon (under 0.10 in. of rain possible), a (40%) chance of rain Friday night (0.30 in. of rain possible), mostly cloudy with a slight (20%) chance of AM showers Saturday, then just mostly cloudy Saturday night highs near 48 lows 38-34. Partly cloudy Sunday and Sunday night, mostly cloudy Monday and Monday night, mostly cloudy with a slight (20%) chance of rain Tuesday (New Year’s Day), then mostly cloudy with a (30%) chance of rain Tuesday night and Wednesday highs 46-52 lows 36-40. (seasonal averages high 51 low 40)
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Forecast for the Cascades of Lane County: AM snow showers likely (60%), a slight (20%) chance of snow showers this afternoon, partly cloudy tonight, mostly cloudy with a slight (20%) chance of snow Friday afternoon, mostly cloudy with a slight (20%) chance of snow Friday night, just mostly cloudy Saturday, then mostly cloudy with a slight (20%) chance of snow showers Saturday night snow level at the surface today, free air freezing level at the surface tonight and Friday AM, snow level 2,500 ft. Friday night, free air freezing level at the surface Saturday, then snow level at the surface Saturday night highs near 30 lows 20-25 cooling to 22 Saturday night. A mix of clouds and sun Sunday, mostly cloudy Sunday night, a mix of clouds and sun Monday, mostly cloudy at night, then mostly cloudy with a slight (20%) chance of rain and snow Tuesday (New Year’s Day) and Tuesday night, then mostly cloudy with a (30%) chance of rain and snow Wednesday free air freezing level at the surface Sunday and Sunday night, 4,500 ft. Monday, 5,000 ft. Monday night, snow level 6,000 ft. Tuesday, 5,000 ft. Tuesday night, then 5,500 ft. Wednesday highs 30-32 lows 23-26.
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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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