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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 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 FROM 10 AM TUESDAY TO 4 PM 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 scattered showers this evening, a slight (20%) chance of rain late tonight, rain Tuesday (0.50 in. possible) and in the evening, showers likely (60%) late Tuesday night, mostly cloudy Wednesday AM, then a mix of clouds and sun with a slight (20%) chance of showers in the afternoon, and partly cloudy with patchy fog Wednesday night lows 35-42 highs 48-55. A mix of clouds and sun with patchy fog in the AM then mostly cloudy with a (40%) chance of rain Thursday (Veterans Day), a (40%) chance of showers Thursday night, mostly cloudy Friday and Friday night, mostly cloudy with a (30%) chance of showers Saturday, mostly cloudy Saturday evening, partly cloudy with a slight (20%) chance of showers Saturday night, a mix of clouds and sun Sunday, partly cloudy Sunday evening, then mostly cloudy overnight, and mostly cloudy with a slight (20%) chance of showers Monday highs 57-52 lows near 42-45. (seasonal averages highs 54 low 38)

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Forecast for the Umpqua Basin including, Roseburg: Mostly cloudy with a slight (20%) chance of showers this evening, a slight (40%) chance of rain late at night, rain and likely (60%) Tuesday AM, then rain and isolated thunderstorms Tuesday afternoon and evening, showers late Tuesday night, mostly cloudy with AM showers likely (60%) Wednesday,  a good (50%) chance of showers Wednesday afternoon, partly cloudy with fog late Wednesday night and Thursday AM, a slight (20%) chance of rain Thursday afternoon (Veterans Day),  then a (30%) chance of evening rain, and a (40%) chance of showers late Thursday night lows 40-44 cooling to 38 Wednesday night highs 43-50 cooling to 47 Thursday. Patchy AM and late night fog then mostly cloudy with a slight (20%) chance of showers Friday and Saturday, mostly cloudy with a slight (20%) chance of showers Saturday night, just partly cloudy Sunday and Sunday night, then partly cloudy with a slight(20%) chance of showers Monday highs 50-55 lows near 40. (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 a slight (20%) chance of evening showers, then a slight (20%) chance of rain late tonight, AM rain Tuesday,  afternoon showers and possible thunderstorms and windy (winds: SW 20-3o mph at the shore and SW 10-20 mph inland), and showers and isolated thunderstorms in the evening, showers late Tuesday night, mostly cloudy with AM showers likely (60%) Wednesday, a good (50%) chance of showers Wednesday afternoon, partly cloudy in the evening, more clouds and patchy fog late Wednesday night lows 46-40 highs 50-56. AM fog and mostly cloudy Thursday (Veterans Day) with a (30%) chance of afternoon rain, a (40%) chance of evening rain, a good (50%) chance of showers late Thursday night, patchy AM fog with a slight (20%) chance of showers Friday, mostly cloudy Friday night, AM fog, mostly cloudy with a (30%) chance of showers Saturday, a slight (20%) chance of showers Saturday night, just mostly cloudy Sunday and Sunday night, and mostly cloudy with a slight (20%) chance of showers  Monday 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 scattered evening rain and snow showers, scattered snow showers tonight, snow likely (60%) Tuesday AM, rain and snow Tuesday afternoon (5-10 in. of snow possible), snow and rain Tuesday evening, rain and snow showers at night (3-6 in. of snow possible), mostly cloudy with a good (50%) chance of rain and snow showers Wednesday, and partly cloudy Wednesday night snow level 3,000 ft. tonight rising to 5,000 ft. Tuesday afternoon, 4,500 ft. Tuesday night, 4,000 ft. Wednesday and a free air freezing level of 5,500 ft. Wednesday night lows 24-34 highs 33-37. A mix of clouds and sun in the morning, then mostly cloudy with a slight (20%) chance of  rain Thursday (Veterans Day), a (40%) chance of showers Thursday night, mostly cloudy Friday AM, a mix of clouds and sun in the afternoon, partly cloudy in the evening, mostly cloudy Friday night, mostly cloudy with a (30%) chance of showers Saturday, a slight (20%) chance of showers Saturday night,  a mix of clouds and sun Sunday, partly cloudy with a slight (20%) chance of showers Sunday night and Monday snow level 6,500 ft. Thursday, 6,000 ft. Thursday night, free air freezing level 5,500 ft. Friday, 5,000 ft. Friday night, snow level 6,500 ft. Saturday and Saturday night, free air freezing level 8,000 ft. Sunday, snow level 7,000 ft. Sunday night, and 8,000 ft. Monday highs 40-45 lows 36-34.

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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.