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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 toward us and will keep sending waves of moisture at the Pacific Northwest. A frontal system pushed through Oregon bringing rain and colder temperatures. Another strong frontal system will be approaching the coast Thursday. All of this ads up to wet and cool weather for a while.
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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: Mostly cloudy with a good (50%) chance of showers today through this evening, a slight (20%) chance of showers late tonight, rain Tuesday and rain likely (60%) Tuesday night, mostly cloudy with a good (50%) chance of showers Wednesday AM, a slight (20%) chance in the afternoon, and a slight (20%) chance of rain Wednesday night highs 46-55 lows 37-42. Mostly cloudy with a (40%) chance of showers Thursday (Veterans Day) and Thursday night, a slight (20%) chance of showers Friday, just mostly cloudy Friday night, mostly cloudy with a (30%) chance of showers Saturday, partly cloudy with a (30%) chance of showers Saturday night, then a mix of clouds and sun Sunday highs 57-54 lows near 42-45. (seasonal averages highs 55 low 38)
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Forecast for the Umpqua Basin including, Roseburg: Mostly cloudy with a good (50%) chance of showers today (snow level 3,500 ft.), and a slight (20%) chance of showers this evening, a slight (20%) chance of rain late at night, rain and snow Tuesday AM, then rain Tuesday afternoon and Tuesday night, mostly cloudy with a (40%) chance of showers Wednesday and a slight (20%) chance of showers Wednesday evening highs near 50 Monday and Wednesday and near 44 Tuesday lows from fluctuating between 36-42. AM fog and mostly cloudy Thursday (Veterans Day) with a slight (20%) chance of showers, a (30%) chance of showers Thursday night, AM fog with a (20%) chance of showers Friday, just mostly cloudy Friday night, AM fog again Saturday then mostly cloudy with a slight (20%) chance of showers through Saturday night, and partly cloudy with a slight chance of showers Sunday highs near 52 lows 38-42. (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 good (50%) chance of coastal showers today, a good (50%) chance of AM showers inland then afternoon showers likely (60%), mostly cloudy tonight with a slight (20%) chance of evening showers, then a slight (20%) chance of rain late tonight, rain and breezy (winds: SE 5-10 mph increasing to S 15-25 mph in the afternoon) Tuesday, and rain Tuesday night highs 54-50 lows 40-43. Mostly cloudy with showers Wednesday, a slight (20%) chance of showers Wednesday evening, patchy AM and late night fog Thursday (Veterans Day) and Thursday night with a good (50%) chance of showers, partly cloudy Friday AM, mostly cloudy with a slight (20%) chance of showers Friday afternoon, just mostly cloudy Friday night, AM fog, mostly cloudy with a slight (20%) chance of showers Saturday, a (30%) chance of showers Saturday night, and a slight (20%) chance of showers Sunday highs 50-55 lows 38-42. (seasonal averages high 58 lows 43).
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Forecast for the Cascades of Lane County: Mostly cloudy with a good (50%) chance of AM snow showers today, then snow showers likely (60%) in the afternoon (1 in. of snow possible), a (30%) chance of evening snow showers, a slight (20%) chance of rain late at night and a good (50%) chance of snow late tonight, rain Tuesday AM with snow likely (60%), rain and snow Tuesday afternoon (3-6 in. of snow possible), snow and rain Tuesday night (4-6 in. of snow possible) snow level falling to 2,500 ft. today, 3,000 ft. tonight, 2,500 ft. Tuesday AM rising to 4,000 ft. in the afternoon, and 3,500 ft. Tuesday night highs 33-36 lows 25-30. Mostly cloudy with a good (50%) chance of rain and snow showers Wednesday, a (30%) chance of rain and snow showers Wednesday night, mostly cloudy with a good (50%) chance of rain and snow showers Thursday (Veterans Day) through Friday, just partly cloudy Friday night, mostly cloudy with a slight (20%) chance of showers Saturday, a (30%) chance of showers Saturday night, and partly cloudy with a slight (20%) chance of showers Sunday snow level 3,500 ft. Wednesday, 4,000 ft. Wednesday night, 4,500 ft. Thursday, 5,000 ft. Thursday night, 4,500 ft. Friday, 5,000 ft. Saturday, rising to 6,000 ft. Saturday night and 7,000 ft. Sunday highs 35-40 lows 30-35.
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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.