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Here is my new weekly weather quiz question. Today is your last chance to win this week. Please define the term “backdoor cold front.” Please remember to post your answer as a comment by clicking on “no comments /comments” in the upper right hand portion of this page under the caption, then add your comment. The first person to post the correct answer will win a week of free personalized weather forecasts tailored to your needs. The answer has to be a comment to win. An email answer will not count. Good luck.
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An upper level low (Shaded “U” shape, more like a donut), called a closed low because it is cut off from the upper air circulation, has taken over bringing rain and dropping temperatures drastically. This unsettled weather will continue for the rest of the week as the low rotates away from us late today and tonight. It looks like there will still be a 50/50 chance of showers for the Memorial Day Holiday itself with temperatures near seasonal normal, so plan accordingly. It will feel the coldest near or on the water, sorry about that. A frontal system will be approaching the West Coast Wednesday. An upper level trough of low pressure (Shaded “U” shape dropping down through Southern California) will keep us in clouds with a chance of precipitation for the next 7 days.
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Advisories: NONE AT THIS TIME.
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Forecast for the Southern and lower Mid Willamette Valley including Eugene-Springfield and Albany-Corvallis: Mostly cloudy with a slight (20%) chance of showers this evening, mostly cloudy tonight, a slight (20%) chance of rain Saturday AM, mostly cloudy with a (40%) chance of rain in the afternoon (under 0.10 in. of rain possible), rain likely (60%) Saturday night, showers likely (60%) Sunday (0.15 in. of rain possible), then mostly cloudy with a (40%) chance of showers Sunday night (0.10 in. of rain possible), cloudy with a good (50%) chance of rain Monday AM, then showers in the afternoon (Memorial Day) and Monday night lows 43-50 cooling to 46 Sunday night warming to 50 Monday night highs 66-60. Mostly cloudy with showers likely (70%) Tuesday, a good (50%) chance of showers at night, showers likely (60%) Wednesday, a good (50%) chance of showers at night and Thursday, mostly cloudy with a slight (20%) chance of showers at night, mostly cloudy Friday AM, then a mix of clouds and sun with a slight (20%) chance of showers Friday afternoon highs 64-67 lows 47-43. (seasonal averages high 69 low 45)
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Forecast for the Umpqua Basin including Roseburg: Just mostly cloudy tonight, mostly cloudy with a slight (20%) chance of showers AM showers, showers likely (70%) Saturday afternoon (under 0.10 in. of rain possible) and Saturday night (0.10 in. of rain possible), mostly cloudy with a (40%) chance of showers Sunday (0.10 in. of rain possible) and Sunday evening, showers likely (60%) late Sunday night and Monday AM, rain in the afternoon (Memorial Day), then showers likely (70%) Monday night lows 46-54 cooling to near 50 Monday night highs 69-62. Mostly cloudy with a good (50%) chance of showers Tuesday, evening showers likely (60%), a good (50%) chance of showers late Tuesday night, showers likely (60%) Wednesday, a good (50%) chance of showers Wednesday night, mostly cloudy with a (40%) chance of showers Thursday, partly cloudy with a slight (20%) chance of showers at night, then mostly cloudy with a slight (20%) chance of showers Friday highs 65-70 lows 50-47. (seasonal averages high 71 low 48)
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Forecast for the South Oregon Coast including Coos Bay and North Bend: Just mostly cloudy tonight, mostly cloudy with a slight (20%) chance of showers Saturday AM, showers likely (60%) in the afternoon (under 0.10 in. of rain possible), showers likely (70%) Saturday night, (0.15 in. of rain possible), mostly cloudy with a (40%) chance of showers Sunday (0.10 in. of rain possible), a good (50%) chance of evening showers, showers likely (70%) late Sunday night, AM rain likely (60%), rain Monday (Memorial Day) and breezy, then showers likely (70%) Monday night lows 47-52 highs near 60. Mostly cloudy with a good (50%) chance of showers Tuesday, showers likely (60%) in the evening, a good (50%) chance of showers late Tuesday night, showers likely (60%) Wednesday, mostly cloudy with a good (50%) chance of showers Wednesday night and Thursday, then a slight (20%) chance of showers Thursday night and Friday highs 62-57 warming to near 60 Friday lows 50-48. (seasonal averages high 60 low 48)
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Forecast for the Cascades of Lane County: Mostly cloudy with a slight (20%) chance of showers tonight, a mix of clouds and sun in the AM, mostly cloudy and warmer with a good (50%) chance of rain Saturday afternoon (under 0.10 in. of rain possible), rain likely (60%) Saturday night (0.25 in. of rain possible), showers likely (60%) Sunday, a good (50%) chance of evening showers, a slight (20%) chance of showers Sunday night (in. of rain possible), cloudy with a good (50%) chance of AM rain, showers Monday afternoon (Memorial Day), then showers again Monday night snow level 5,500 ft. tonight, 6,000 ft. Saturday, 7,500 ft. Saturday night, 6,500 ft. Sunday and Sunday night, 7,000 ft. Monday, then 7,500 ft. Monday night lows 33-39 cooling to 36 Monday night highs 52-48 warming to near 50 Monday. Mostly cloudy with showers likely (60%) Tuesday, cloudy with a good (50%) chance of showers Tuesday night, showers likely (70%) Wednesday, cloudy with a good (50%) chance of showers at night, rain and snow showers likely (60%) Thursday, then mostly cloudy with a slight (20%) chance of showers Thursday night and Friday snow level 6,500 ft. Tuesday, 7,000 ft. Tuesday night, 6,500 ft. Wednesday, 6,000 ft. at night, 5,000 ft. Thursday, 6,000 ft. at night, then 6,500 ft. Friday highs 50-53 lows 37-32 warming to near 35 Thursday night.
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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.
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