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Sorry no winner this week. Just in case you missed it, here for the last time 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? The correct answer is lightning. I’ll have another weekly weather quiz question for you starting Monday. The first person to post the correct answer will win a week of free personalized weather forecasts tailored to your needs.

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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 will be moving into Oregon from British Columbia through Washington bringing with it cold air that will drop snow levels well below the passes. An arctic air mass will be pushed South by a strong jet stream (see airflow graphic above) and will move down behind that cold front Sunday night through Tuesday giving us the possibility of some snowflakes even reaching the Valley floor.

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Advisories: A WINTER STORM WARNING IS IN EFFECT UNTIL 10 PM THIS EVENING ABOVE 2,000 FT. FOR EASTERN CURRY COUNTY AND JOSEPHINE COUNTY OF OREGON. A WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 7 PM TONIGHT THROUGH 7 AM SUNDAY ABOVE 2,000 FT. FOR JACKSON COUNTY 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 a (40%) chance of showers tonight and Sunday AM, snow showers likely (60%) in the afternoon (0.10 in. of rain possible), showers likely (60%)  Sunday night (snow level 1,200 ft. little or no accumulation expected) (0.25 in. of rain possible), mostly cloudy with showers likely (60%) Monday (snow level 1,200 ft.) (0.25 in. of rain possible), a (40%) chance of rain and snow showers Monday night (snow level falling to 500 ft.) lows 32-26 highs 42-37. A mix of clouds and sun Tuesday through Thursday (Thanksgiving Day), partly cloudy at night, then mostly cloudy with a slight (20%) chance of rain Friday and a (30%) chance of rain Friday night and Saturday highs 38-46 lows 30-36. (seasonal averages highs 50 low 37)

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Forecast for the Umpqua Basin including, Roseburg: Mostly cloudy with rain and snow showers this evening, rain and snow showers likely (60%) tonight (snow level 500 ft. tonight) (1 in. of snow possible), cloudy Sunday with a good (50%) chance of AM rain and snow showers Sunday, then rain and snow showers likely (60%) in the afternoon (snow level 500 ft. rising to 2,000 ft. in the afternoon) (1-2 in. of snow possible), rain and snow showers Sunday night and Monday (snow level 1,500 ft. Sunday night falling to 1,000 ft. late at night), mostly cloudy with rain and snow showers likely (60%) Monday night (snow level 1,000 ft.) lows 33-35 highs 40-37. Mostly cloudy with a slight (20%) chance of snow showers Tuesday AM, a slight (20%) chance of snow Tuesday night, patchy AM and late at night  fog Wednesday and Wednesday night,  patchy AM fog Thursday (Thanksgiving Day) then mostly cloudy, partly cloudy with areas of fog Thursday night, patchy AM fog Friday then mostly cloudy with a slight (20%) chance of showers Friday afternoon, then mostly cloudy with a slight (20%) chance of rain Friday night and Saturday highs 34-47 lows 27-37. (seasonal averages high 54 low 39)

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Forecast for the South Oregon Coast including Coos Bay and North Bend: Cloudy with coastal showers this evening then showers likely (60%) late tonight (snow level 2,000 ft. lowering to 1,500 ft. late at night little or no accumulation expected), cloudy Sunday with a good (50%) chance of AM coastal showers, then showers Sunday afternoon, a good (50%) chance of AM rain and snow showers inland then rain and snow showers in the afternoon (snow level 2,000 ft. no accumulation expected), coastal showers Sunday night, evening showers then rain and snow showers late Sunday night inland (snow level 2,000 ft. no accumulation expected), coastal showers likely (60%) and rain and snow showers likely (60%) inland Monday and Monday night (snow level 1,500 ft. Monday and 1,000 ft. Monday night), breezy Monday night (wind: W 20-25 mph shifting NW 10-20 mph late at night ) lows 37-33 highs 43-45. Mostly cloudy with a (40%) chance of rain and snow showers Tuesday AM and a slight (20%) chance of rain and snow Tuesday night, patchy AM fog and mostly cloudy Wednesday and not as cool, partly cloudy with fog late Wednesday night, AM fog Thursday (Thanksgiving Day) then mostly cloudy, partly cloudy with areas of fog Thursday night, AM fog then mostly cloudy with a slight (20%) chance of showers Friday afternoon, mostly cloudy with a slight (20%) chance of rain Friday night, and a (30%) chance of rain Saturday highs 40-50 lows near 30-35. (seasonal averages high 56 lows 42).

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Forecast for the Cascades of Lane County:  Cloudy with snow showers tonight and Sunday AM, snow showers likely (60%) in the afternoon (2 in. of snow possible), snow showers Sunday night (4-8 in. of snow possible) and Monday (5-9 in. of snow possible), mostly cloudy with snow showers likely (60%) and colder Monday night,  partly cloudy with a slight (20%) chance of snow showers Tuesday, a slight (20%) chance of rain Tuesday night snow level at the surface through Tuesday night lows 22-10 warming to 16 Tuesday night highs 25-20. Partly cloudy with a slight (20%) chance of rain Wednesday and Wednesday night, a mix of clouds and sun Thursday (Thanksgiving Day), partly cloudy Thursday night with a slight (20%) chance of rain,  mostly cloudy with a slight (20%) chance of rain Friday through Saturday snow level at the surface Wednesday and Wednesday night, free air freezing level 3,000 ft. Thursday and Thursday night, and a snow level 2,500 ft. Friday, 3,500 ft. Friday night, and 3,000 ft. Saturday highs 30-38 lows 20-26-23.

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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.