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Here is this week’s weather quiz question. This is a very basic weather question. What is a “rain shadow?” For extra ah ha points how does it work in Oregon weather? Please place your answer as a post on this page after the forecasts. 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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An upper level trough of low pressure (“U” shaped shaded area) is moving Eastward and will keep sending waves of moisture at the Pacific Northwest. A frontal system will push into Oregon tonight bringing rain some wind, and mountain snow. A strong frontal system will be approaching the coast Thursday. All of this adds up to wet and cool weather for a while, but next weekend has the potential of being dry as high pressure takes over.

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Advisories:  A WINTER WEATHER ADVISORY IS IN EFFECT UNTIL  4 AM WEDNESDAY ABOVE 3,500 FT. FOR THE NORTH CASCADES INCLUDING THE CASCADES OF LANE COUNTY.

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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 this evening, showers likely (60%) late tonight (0.25 in. possible), mostly cloudy Wednesday with a slight (20%) chance of showers, partly cloudy with patchy fog Wednesday night and Thursday AM, mostly cloudy with good (50%) chance of afternoon rain Thursday (Veterans Day), showers likely (60%) Thursday night lows 36-40 highs 50-53.  Mostly cloudy Friday with a slight (20%) chance of showers, just mostly cloudy Friday night, mostly cloudy with a (30%) chance of showers Saturday, mostly cloudy with a slight (20%) chance of showers Saturday night, mostly cloudy in the AM, a mix of clouds and sun Sunday afternoon, partly cloudy Sunday night, a mix of clouds and sun Monday AM,  mostly cloudy with a slight (20%) chance of showers Monday afternoon and night, and mostly cloudy with a (30%) chance of showers Tuesday highs 52-54 lows near 40. (seasonal averages highs 54 low 38)

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Forecast for the Umpqua Basin including, Roseburg: Mostly cloudy with showers and a slight (20%) chance of an isolated thunderstorm this evening (gusty winds possible in storms), showers late tonight, AM showers likely (60%) Wednesday,  a good (50%) chance of showers Wednesday afternoon, partly cloudy with patchy fog Wednesday night and Thursday AM, mostly cloudy with a slight (20%) chance of rain Thursday afternoon (Veterans Day), then a (40%) chance of rain Thursday night lows 45-39 highs near 52. Mostly cloudy with a slight (20%) chance of showers Friday AM, partly cloudy Friday night and a slight (20%) chance of showers Saturday, mostly cloudy with a slight (20%) chance of showers Saturday night, just  mostly cloudy Sunday and Sunday night,  partly cloudy Monday, mostly cloudy with a slight (20%) chance of rain Monday night and (30%) Tuesday highs 50-60 lows fluctuating between 42 and 46. (seasonal averages high 58 low 41)

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Forecast for the South Oregon Coast including Coos Bay and North Bend: Mostly cloudy with showers and isolated thunderstorms (possible gusty winds in storms) tonight, mostly cloudy with AM showers likely (60%) Wednesday, a good (50%) chance of showers Wednesday afternoon, partly cloudy in the evening, more clouds Wednesday night with patchy fog late, mostly cloudy with a (30%) chance of coastal rain Thursday (Veterans Day), partly cloudy in the AM then mostly cloudy with a slight (20%) chance of afternoon rain inland, and a (40%) chance of rain Thursday night lows 40-45 highs near 55. Mostly cloudy with fog and a slight (20%) chance of showers Friday AM, partly cloudy Friday night, AM fog, mostly cloudy with a (30%) chance of showers Saturday, cloudy with a slight (20%) chance of showers Saturday night, just mostly cloudy Sunday through Monday, a slight (20%) chance of rain Monday night, and a (30%) chance of rain Tuesday highs 53-57 lows 43-40. (seasonal averages high 58 lows 43).

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Forecast for the Cascades of Lane County:  Mostly cloudy with rain and snow showers tonight (4-8 in. of snow possible), mostly cloudy with rain and snow showers likely (60%) Wednesday AM, a good (50%) chance of rain and snow showers in the afternoon (2 in. of snow possible), and partly cloudy Wednesday night, then mostly cloudy with a slight (20%) chance of  rain Thursday (Veterans Day) afternoon, and showers likely (60%) Thursday night (2 in. of snow possible) snow level 3,500 ft. tonight, 4,000 ft. Wednesday afternoon,  a free air freezing level of 4,500 ft. Wednesday night, a snow level of 5,500 ft. Thursday and Thursday night lows 28-34 highs 30-27. Mostly cloudy with a slight (20%) chance of rain and snow showers Friday, mostly cloudy in the evening, partly cloudy Friday night, AM clouds and sun Saturday, mostly cloudy with a (30%) chance of showers Saturday night, mostly cloudy Sunday, partly cloudy with a slight (20%) chance of showers Sunday night,  then partly cloudy with a slight (20%) chance of showers Monday, (30%) Monday night and Tuesday snow level 4,000 ft. Friday, free air freezing level 4,000 ft. Friday, 5,000 ft. Friday night, snow level 6,500 ft. Saturday, 8,000 ft. Saturday night, free air freezing level  10,000 ft. Sunday, snow level above 8,000 ft. Sunday night through Tuesday highs 40-46 lows 32-34.

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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.