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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 pushed into Oregon bringing rain some wind, and mountain snow. A strong frontal system will be approaching the coast Thursday (position shown is on Friday after it passes by), but there may be a break of dry weather early Thursday just in time for the area Veterans Day parades. You still should have some rain gear ready just in case the sprinkles return early. All of this adds up to wet and cool weather for a while, but at least part of next weekend has the potential of being dry as high pressure takes over.

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Advisories:  A FROST ADVISORY IS IN EFFECT FROM 2 AM TO 9 AM THURSDAY FOR EASTERN CURRY COUNTY, JOSEPHINE COUNTY,  AND JACKSON 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 patchy AM fog and a slight (20%) chance of showers, partly cloudy with this afternoon, patchy fog tonight and Thursday AM, mostly cloudy with good (50%) chance of afternoon rain Thursday afternoon (Veterans Day), showers likely (60%) Thursday night highs 50-53 lows 36-40. Mostly cloudy Friday with a slight (20%) chance of showers, just mostly cloudy Friday night, partly 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 53-55 lows near 40. (seasonal averages highs 54 low 38)

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Forecast for the Umpqua Basin including, Roseburg: Mostly cloudy with showers likely (60%) this AM (snow level 3,500 ft.), a good (50%) chance of showers this afternoon, partly cloudy with patchy fog late tonight and Thursday AM, mostly cloudy with a slight (20%) chance of rain Thursday afternoon (Veterans Day), then a (40%) chance of rain Thursday night  highs near 52 lows 38-43. Mostly cloudy with a slight (20%) chance of showers Friday AM, partly cloudy Friday night, patchy AM fog then mostly cloudy Saturday, mostly cloudy Saturday night  through Sunday night,  partly cloudy Monday with a slight (20%) chance of showers, then mostly cloudy with a slight (20%) chance of showers Monday night and Tuesday highs 53-60 lows fluctuating between 39 to 46. (seasonal averages high 57 low 41)

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Forecast for the South Oregon Coast including Coos Bay and North Bend: Mostly cloudy with AM coastal showers likely (60%) today, showers this AM then a good (50%) chance of showers this afternoon inland, partly cloudy in the evening, more clouds tonight with patchy fog late, mostly cloudy with a (40%) 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 highs near 55-52 lows 40-45. 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,  just mostly cloudy Saturday night through Sunday night, partly cloudy with a slight (20%) chance of showers Monday, then mostly cloudy with a slight (20%) chance of showers Monday night through Tuesday highs 53-57 lows bouncing between 40-45. (seasonal averages high 58 lows 43).

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Forecast for the Cascades of Lane County:  Mostly cloudy with scattered showers this AM, a good (50%) chance of isolated showers in the afternoon, partly cloudy tonight, 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. this afternoon, a free air freezing level of 4,500 ft. tonight, a snow level of 4,000 ft. Thursday rising to 6,000 ft. in the afternoon and back down to 4,000 ft. late Thursday night highs  35-42 lows 28-34. Mostly cloudy with a (%) chance of AM showers then a slight (20%) chance of showers Friday afternoon,  partly cloudy Friday night, partly cloudy Saturday with a (%) chance of showers, mostly cloudy with a (30%) chance of showers Saturday night, mostly cloudy Sunday, mostly cloudy with a slight (20%) chance of showers Sunday night,  then partly cloudy with a slight (20%) chance of showers Monday through Tuesday snow level 5,000 ft. falling to 4,000 ft. Friday afternoon, free air freezing level 5,000 ft. Friday night, snow level 6,500 ft. Saturday, 7,000 ft. Saturday night, free air freezing level  9,000 ft. Sunday, snow level 8,000 ft. Sunday night and above 8,000 ft. Monday through Wednesday highs 40-46 lows 34-32.

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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.