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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 with a surface frontal system bringing the rain chance back quickly. High pressure will slide back in drying us again Friday lasting for at least part of the weekend.
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Advisories: NONE AT THIS TIME.
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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 this AM, a mix of clouds and sun, then mostly cloudy with (30%) chance of rain this afternoon (Veterans Day), showers likely (60%) this 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 highs 55-49 lows 38-42. 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 53 low 38)
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Forecast for the Umpqua Basin including, Roseburg: Mostly cloudy with patchy fog this AM and patchy frost, mostly cloudy in the afternoon (Veterans Day), mostly cloudy with a (40%) chance of rain this evening, a slight (20%) chance of showers late tonight, mostly cloudy Friday, partly cloudy Friday night with patchy fog late highs near 52 lows 42-37. 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 rain Sunday and just mostly cloudy Sunday night, partly cloudy Monday, mostly cloudy with a slight (20%) chance of rain Monday night and Tuesday, just mostly cloudy Tuesday night, and just mostly cloudy Wednesday with a slight (20%) chance of afternoon rain highs 53-57 lows fluctuating between 39 to 46. (seasonal averages high 57 low 40)
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Forecast for the South Oregon Coast including Coos Bay and North Bend: Patchy fog this AM, mostly cloudy with a slight (20%) chance of rain this afternoon (Veterans Day), mostly cloudy with a (40%) chance of rain this evening and tonight, a (40%) chance of rain inland, mostly cloudy Friday and in the evening, partly cloudy Friday night with patchy fog late highs near 55 lows 43-40. 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 with a slight (20%) chance of afternoon rain highs 54-57 lows bouncing between 44-47. (seasonal averages high 57 lows 43).
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Forecast for the Cascades of Lane County: A mix of clouds and sun with a slight (20%) chance of rain this afternoon (Veterans Day), showers likely (60%) tonight (1-3 in. of snow possible), mostly cloudy with a slight (20%) chance snow showers Friday, and partly cloudy Friday night snow level 7,000 ft. today, falling to 5,000 ft .late tonight, 3,000 ft. rising to 3,500 ft. Friday, and a free air freezing level of 3,000 ft. Friday night highs 42-37 lows 30-33. 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.