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This is your last chance to answer my weekly weather quiz question for this week. What are the three conditions needed to form a rainbow? Please post your answer as a comment by clicking on “no 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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The jet stream shows another cold trough of low pressure ( “U” shaped area) migrating Eastward across the Pacific Northwest. The precipitation will be continuing in waves as a new frontal system marches through Oregon. There will be little breaks between those waves, but for the most part our near future will stay wet. More frontal systems will be coming our way next week producing even more precipitation.

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Advisories: A WINTER WEATHER ADVISORY IS IN EFFECT UNTIL 4 AM SATURDAY ABOVE 3,500 FT. FOR THE NORTH OREGON CASCADES AND THE CASCADES OF LANE 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:  Mostly cloudy rain tonight (0.50 in. of rain possible), showers Saturday AM, rain likely (60%) in the afternoon (0.25 in. of rain possible), rain Saturday night (0.25 in. of rain possible),  AM rain likely (60%) Sunday, partly cloudy with a good (50%) chance of rain in the afternoon (0.10 in of rain possible),  a good (50%) chance of rain Sunday night (0.10 in. of rain possible), a (40%) chance of showers Monday and Monday night lows 40-33 highs 52-47. A mix of clouds and sun Tuesday AM, mostly cloudy with a good (50%) chance of showers Tuesday afternoon, a good (50%) chance of rain Tuesday night and Wednesday, then rain likely (60%) Wednesday night through Friday highs 52-54 cooling to 49 by Friday lows 33-38. (seasonal  averages high 54 low 36)

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Forecast for the Umpqua Basin including, Roseburg:  Mostly cloudy with rain tonight and Saturday AM, rain likely (60%) in the afternoon, then rain Saturday night,  rain Sunday AM, rain likely (60%) Sunday afternoon (snow level 2,500 ft. rising to 3,500 ft.), showers likely (60%) Sunday night (snow level 3,000 ft. falling to 2,500 ft. late at night), a good (50%) chance of rain and snow Monday through Tuesday AM, a (40%) chance of showers in the afternoon, then a (40%) chance of rain Tuesday night lows 42-35 highs 55-52. Mostly cloudy with a (40%) chance of showers Wednesday, a good (50%) chance of rain Wednesday night, rain Thursday, showers likely (60%) in the evening,  rain and snow showers likely (60%) late Thursday night and Friday AM, then showers likely (60%) Friday afternoon highs 58-53 lows near 40. (seasonal averages high 58 low 38)

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Forecast for the South Oregon Coast including Coos Bay and North Bend: Mostly cloudy with rain tonight and breezy (wind: S 20-30 mph gusts to 40 mph switching SW 10-15 mph late), rain likely (60%) Saturday, rain Saturday night, rain  likely (60%) Sunday, showers likely (60%) Sunday night and Monday, a (50%) chance of showers Monday night and Tuesday, then rain likely (60%) Tuesday night lows 45-38 highs near 50. Mostly cloudy with showers likely (60%) Wednesday, a good (50%) chance of evening rain, rain likely (60%) Wednesday night, rain Thursday, then showers likely (60%) Thursday night and Friday highs near 52 lows near 40. (seasonal averages high 55 low 41).

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Forecast for the Cascades of Lane County:  Mostly cloudy with rain and snow tonight (5-9 in. of snow possible), rain and snow showers Saturday  AM, snow and rain likely (60%) Saturday afternoon (2-5 in. of snow possible),  snow and rain Saturday night (3-7 in. of snow possible), snow and rain likely (60%) Sunday AM, partly cloudy with a good (50%) chance of rain and snow Sunday afternoon (1-3 in. of snow possible), rain likely and a good (50%) chance of rain and snow showers Sunday night (2 in. of snow possible), then a (40%) chance of snow showers Monday and Monday night snow level 4,000 ft. tonight , then 4,500 ft. Saturday, 3,000 ft. Saturday night, 2,500 ft Sunday, then 2,500 ft. Monday and Monday night lows 28-20 highs 40-33.  Mostly cloudy with a good (50%) chance of snow showers Tuesday, a good (50%) chance of snow Tuesday night and Wednesday, a good (50%) chance of rain Wednesday night, rain likely (60%)  Thursday, then rain and snow likely (60%) Thursday night and Friday snow level at the surface Tuesday, 3,000 ft. Tuesday night,  4,000 ft. Wednesday, 5,500 ft. Wednesday night, 4,000 ft. Thursday, 3,500 ft. Thursday night, and 4,000 ft. Friday highs 37-44 cooling to 36 Friday lows 25-22.

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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.