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Here is my new weekly weather quiz question. 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 complex 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 showers likely (70%) this AM, a (40%) chance of showers this afternoon (0.10 in. of rain possible), a slight (20%) chance of showers tonight (under 0.10 in. of rain possible) and Saturday AM, mostly cloudy with a good (50%) chance of showers Saturday afternoon (under 0.10 in. of rain possible) through Sunday evening (0.15 in. of rain possible), then mostly cloudy with a (40%) chance of rain Sunday night (0.10 in. of rain possible)highs 60-66 lows 43-48. Cloudy with a good (50%) chance of rain Monday AM, rain likely (60%) in the afternoon (Memorial Day), a good (50%) chance of showers at night, mostly cloudy with rain likely (70%) Tuesday and Tuesday night, cloudy with a good (50%) chance of showers Wednesday, then mostly cloudy with a good (50%) chance of showers at night and Thursday highs 63-65 lows 50-45. (seasonal averages high 69 low 45)
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Forecast for the Umpqua Basin including Roseburg: Mostly cloudy with a (40%) chance of showers today (under 0.10 in. of rain possible), just mostly cloudy tonight, then mostly cloudy with a (30%) chance of showers Saturday (under 0.10 in. of rain possible), a good (50%) chance of showers Saturday night (0.10 in. of rain possible), then mostly cloudy with a (40%) chance of showers Sunday (0.10 in. of rain possible) and Sunday evening, then rain likely (60%) late at night highs 65-70 lows 46-54 cooling to near 50 Sunday night. Cloudy with a rain likely (60%) Monday (Memorial Day), showers likely (60%) Monday night, cloudy with a good (50%) chance of showers Tuesday, showers likely (60%) Tuesday night and Wednesday, then mostly cloudy with a good (50%) chance of showers Wednesday night and Thursday highs 67-70 cooling to 67 by Thursday lows 52-50. (seasonal averages high 71 low 48)
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Forecast for the South Oregon Coast including Coos Bay and North Bend: Mostly cloudy with coastal showers likely (70%) this AM and a slight (50%) chance of showers this afternoon while a (30%) chance of showers inland today (under 0.10 in. of rain possible), a slight (20%) chance of coastal showers late tonight (under 0.10 in. of rain possible), mostly cloudy with a (30%) chance of showers Saturday (under 0.10 in. of rain possible), coastal showers likely (60%) Saturday night while a good (50%) chance of evening inland showers and inland showers likely (60%) late Saturday night (0.15 in. of rain possible), a good (50%) chance of showers Sunday (0.10 in. of rain possible), then rain likely (60%) at night highs 57-62 lows 47-53 falling to near 50 Sunday night. Mostly cloudy with rain likely (60%) Monday (Memorial Day), showers likely (70%) at night, a good (50%) chance of showers Tuesday, showers likely (60%) Tuesday night and Wednesday, then mostly cloudy with a good (50%) chance of showers Wednesday night and Thursday highs 58-62 cooling to 57 Thursday lows 52-50. (seasonal averages high 60 low 48)
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Forecast for the Cascades of Lane County: Mostly cloudy with rain and snow showers this AM, a good (50%) chance of rain and snow showers this afternoon (0.10 in. of rain possible, 1 in. of snow possible), a (30%) chance of rain and snow showers tonight and Saturday AM, a mix of clouds and sun and a bit warmer with a (40%) chance of showers Saturday afternoon, mostly cloudy with showers likely (60%) Saturday night, a good (50%) chance of showers Sunday, then mostly cloudy with a (40%) chance of evening showers and a good (50%) chance of rain Sunday night snow level 4,500 ft. today, 5,500 ft. tonight, 6,000 ft. Saturday, 7,000 ft. Saturday night, then 6,500 ft. Sunday and Sunday night highs 45-52 lows 33-39. Cloudy with a good (50%) chance of AM rain, rain likely (60%) Monday afternoon (Memorial Day), showers likely (60%) Tuesday and Tuesday night, then mostly cloudy with showers likely (60%) Wednesday and Thursday with cloudy skies and a good (50%) chance of showers Wednesday night snow level 8,000 ft. Monday and Monday night, 7,000 ft. Tuesday, above 8,000 ft. Tuesday night, 7,000 ft. Wednesday, 6,500 ft. at night, then 5,500 ft. Thursday highs 53-50 lows 39-34.
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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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