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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 a weak ridge of high pressure (“Arch” shaped shaded area) is clearing us up just a bit. another trough of low pressure  follows close behind bringing the rain chance back quickly. There may be a noticeable break of dry weather early Thursday just in time for the area Veterans Day parades, but I’d have the rain gear handy.

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Advisories:  A FROST ADVISORY IS IN EFFECT FROM 2 AM TO 9 AM THURSDAY FOR CENTRAL DOUGLAS COUNTY (INCLUDING ROSEBURG), EASTERN DOUGLAS COUNTY, 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: Partly cloudy patchy fog late tonight and Thursday AM, a mix of clouds and sun, then mostly cloudy with (30%) chance of rain Thursday afternoon (Veterans Day), showers likely (60%) Thursday evening, a good (50%) chance of showers late at night, AM fog then mostly cloudy Friday, partly cloudy Friday night with patchy fog late, mostly cloudy with a slight (20%) chance of showers Saturday, a (30%) chance of showers Saturday night lows 38-42 highs 55-49. Mostly cloudy with a slight (20%) chance of rain Sunday, just mostly cloudy Sunday night, a (30%) chance of rain Monday, Monday night and Tuesday, partly cloudy with a (30%) chance of showers Tuesday night, and a (30%) chance of showers Wednesday highs 55-47 lows 42-37. (seasonal averages highs 54 low 38)

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Forecast for the Umpqua Basin including, Roseburg: Partly cloudy with patchy fog late  this evening and tonight into Thursday AM with patchy frost, partly cloudy Thursday AM (Veterans Day),  mostly cloudy in the afternoon, mostly cloudy with a (40%) chance of rain Thursday night, mostly cloudy with a slight (20%) chance of showers Friday AM, partly cloudy Friday night with patchy fog late lows 38-43 highs near 52. Patchy AM fog then mostly cloudy with a slight (20%) chance of rain Saturday afternoon and Saturday night, then patchy fog late, mostly cloudy with a slight (20%) chance of showers Sunday and Sunday night,  partly cloudy Monday, mostly cloudy with a slight (20%) chance of rain Monday night through Tuesday night, and just mostly cloudy Wednesday highs 53-57 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 clear this evening, more clouds tonight with patchy fog late this evening, late tonight and Thursday AM, mostly cloudy with a slight (20%) chance of coastal rain Thursday afternoon (Veterans Day), partly cloudy in the AM then mostly cloudy with a slight (20%) chance of afternoon rain inland, mostly cloudy with evening coastal rain likely (60%) and  a (40%) chance of rain Thursday night, a (40%) chance of rain inland, mostly cloudy with a slight (20%) chance of showers Friday, partly cloudy Friday night with patchy fog late lows 40-43 highs near 55. AM fog, mostly cloudy with a slight (20%) chance of rain Saturday afternoon and Saturday night with patchy fog late, a (30%) chance of showers Sunday and a slight (20) chance Sunday night, just mostly cloudy Monday, mostly cloudy with a slight (20%) chance of rain Monday night through Tuesday night, then just mostly cloudy Wednesday highs 54-57 lows bouncing between 44-47. (seasonal averages high 58 lows 43).

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Forecast for the Cascades of Lane County:  Partly cloudy tonight, a mix of clouds and sun with a slight (20%) chance of  rain (mainly to the North) Thursday (Veterans Day), showers likely (60%) Thursday night (2 in. of snow possible), mostly cloudy with a slight (20%) chance snow showers Friday, and partly cloudy Friday night free air freezing level of 6,000 ft. late tonight, a snow level of 7,000 ft. Thursday,  falling to 5,000 ft .late Thursday night, 3,000 ft. rising to 3,500 ft. Friday, and a free air freezing level of 3,000 ft. Friday night lows 27-33 highs 42-37. Mostly cloudy Saturday with a slight (20%) chance of rain Saturday through Sunday,  then just mostly cloudy Sunday night, mostly cloudy with a slight (20%) chance of rain Monday, a (40%) chance of showers Monday night and Tuesday, mostly cloudy with a (40%) chance of rain and snow showers Tuesday night, and partly cloudy with a (40%) chance of rain and snow showers Wednesday snow level 6,500 ft. rising to 7,000 ft.. Saturday, 7,000 ft. Saturday night, 8,000 ft. Sunday, free air freezing level 11,000 ft. Sunday night, snow level above 8,000 ft. Monday. 7,000 ft. Monday night, 5,000 ft. Tuesday, 4,500 ft. Tuesday night, and 4,000 ft. Wednesday highs 40-46 cooling to 37 Tuesday and 36 Wednesday lows 33-27.

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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.