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Here again is my new weather quiz question for this week. On average there are about 50,000 of these per day over the world and 10 million of them in a year. What kind of weather event am I describing? Please post your answer as a comment after the forecasts on this page. The first person to post the correct answer will win a week of free personalized weather forecasts tailored to your needs. Good luck.

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The upper airflow is bringing much colder air toward us both aloft and at the surface.  Another trough of low pressure will slide in along the coast sending more storms our way and dropping snow levels in the mountains. A complex frontal system moving in from the northwest is moving through Oregon with rain and some wind as the result and snow levels falling. An arctic air mass pushed South by a strong jet stream (see airflow graphic above) will move down behind a cold front on Monday  giving us the possibility of some snowflakes reaching the Valley floor.

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Advisories:  A WINTER WEATHER ADVISORY IS IN EFFECT   UNTIL MIDNIGHT TONIGHT FOR THE NORTHERN OREGON CASCADE FOOTHILLS AND THE CASCADE FOOTHILLS OF LANE COUNTY AND FOR THE CASCADES OF LANE COUNTY. A WINTER WEATHER ADVISORY IS IN EFFECT UNTIL MIDNIGHT TONIGHT FOR THE NORTH AND CENTRAL COAST RANGE OF OREGON.

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Here are your detailed forecasts. **

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Forecast for the Southern and lower Mid Willamette Valley including Eugene-Springfield and Albany-Corvallis: Mostly cloudy with showers likely (60%) tonight (0.25 in. of rain possible), showers likely Friday AM, then more intense Friday afternoon ( o.25 in. of rain possible), showers likely (60%) Friday night through Saturday night, mostly cloudy with a good (50%) chance of showers Sunday and Sunday night lows 35-32 highs 45-40. Mostly cloudy with a (40%) chance of showers Monday and Monday night, a slight (20%) chance of showers Tuesday and Tuesday night, then partly cloudy with a slight (20%) chance of showers Wednesday through Thursday (Thanksgiving Day) highs 40-43 lows 28-34. (seasonal averages highs 51 low 37)

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Forecast for the Umpqua Basin including, Roseburg: Mostly cloudy with rain and snow showers likely (60%) tonight (snow level 2,500 ft. falling to 2,000 ft.) (1 in. of snow possible),  patchy fog late at night and Friday AM, rain and snow showers likely (60%) in the morning with rain and snow showers in the afternoon Friday (snow level rising to 2,500 ft. in the afternoon) (1 in. of snow possible), rain and snow showers likely (60%) in the evening, rain and snow showers late Friday night (snow level 2,500 ft. falling to 2,000 ft. late) (1-2 in. of snow possible), then rain and snow Saturday (snow level 1,500 ft. rising to 2,000 ft. in the afternoon), rain and snow likely (60%) Saturday evening, rain and snow showers likely (60%) Saturday night (snow level 2,000 ft. falling to 1,500 ft. late at night) lows 38-34 highs 44-40. Cloudy with a good (50%) chance of rain and snow showers Sunday AM, then rain and snow showers likely (60%) Sunday afternoon through Monday night and patchy fog late at night and Tuesday AM, mostly cloudy with a slight (20%) chance of rain and snow showers Tuesday afternoon through Tuesday night with patchy fog late, then AM and late night fog with some lingering fog Wednesday through Thursday (Thanksgiving Day) highs 40-46 lows 32-36 cooling to near 30 Tuesday night warming to 36 Wednesday night. (seasonal averages high 54 low 39)

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Forecast for the South Oregon Coast including Coos Bay and North Bend: Cloudy with showers likely (60%) tonight, coastal showers and scattered thunderstorms Friday with AM showers likely (60%) inland then showers in the afternoon, showers Friday night (snow level 2,000 ft.), coastal rain and isolated thunderstorms Saturday, AM rain and snow inland then rain and isolated thunderstorms Saturday afternoon, rain Saturday evening, coastal showers late at night and rain and snow showers likely (60%) late at night inland lows 40-33 highs 50-44. Mostly cloudy with a good (50%) chance of rain and snow showers Sunday AM, showers likely (60%) in the afternoon and evening, rain and showers likely (60%) late Sunday night and Monday AM, mostly cloudy with showers likely (60%) in the afternoon, rain and snow showers likely (60%) Monday night with patchy fog late, patchy fog Tuesday AM, mostly cloudy with a slight (20%) chance of Tuesday afternoon, a slight (20%) chance of showers Tuesday night with patchy fog late, then just mostly cloudy with AM and late night fog and some lingering fog Wednesday through Thursday (Thanksgiving Day) highs 45-50 lows 37-34  warming to near 40 Thursday. (seasonal averages high 56 lows 42).

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Forecast for the Cascades of Lane County:  Cloudy with snow showers this evening, then likely (60%) tonight (3-6 in. of snow possible), snow showers likely (60%) Friday (2-5 in. of snow possible) and Friday night (2-4 in. of snow possible), mostly cloudy with a good (50%) chance of snow showers Saturday and Saturday night, snow showers likely (60%) Sunday, and a good (50%) chance of snow showers Sunday night snow level at the surface through Saturday, and 2,500 ft. Saturday night, and at the surface Sunday and Sunday night lows 24-20 highs near 30. Mostly cloudy with a good (50%) chance of snow showers Monday through Tuesday, a slight (20%) chance of snow showers Tuesday night and Wednesday, and partly cloudy with a slight (20%) chance of  snow showers Wednesday night through Thursday (Thanksgiving Day) snow level at the surface Monday through Thursday highs 25-30 lows near 20.

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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.