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Here is my weekly weather quiz question. 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.  A strong low offshore has sent a strong frontal system through Oregon. More frontal systems will be coming our way this week producing even more precipitation. That means it will be getting wetter and staying that way 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 showers likely (60%) and a slight (20%) chance of thunderstorms this evening (possible hail), a slight (20%) chance of showers (0.25 in. of rain possible, more in thunderstorms) late tonight with patchy fog late and Friday AM, mostly cloudy with a good (50%) chance of rain in the afternoon (0.10 in. of rain possible), rain Friday night (0.50 in. of rain possible), showers likely (60%) Saturday AM, rain likely (60%) in the afternoon (0.25 in. of rain possible), rain Saturday night (0.25 in. of rain possible) lows 35-39 highs near 53. Mostly cloudy with showers likely (60%) Sunday, a good (50%) chance of showers Sunday night, a (40%) chance of rain Monday, a good (50%) chance of showers Monday night,  showers likely (60%) Tuesday, then rain likely (60%) Tuesday night through Thursday highs 47-52 lows 34-37. (seasonal  averages high 54 low 36)

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Forecast for the Umpqua Basin including, Roseburg:  Mostly cloudy with rain and snow showers this evening, isolated rain and snow showers late tonight (snow level 2,500 ft. falling to 2,000 ft. late, 1 in. of snow possible),  a (30%) chance of rain and snow Friday (snow level 3,000 ft.), rain Friday night through Saturday AM, rain likely (60%) in the afternoon, then rain Saturday night lows 35-40 highs 56-54.  Mostly cloudy with rain Sunday AM, rain likely (60%) Sunday afternoon, rain and snow likely (60%) Sunday night, cloudy with rain and snow likely (60%) Monday and Monday night, rain and snow likely (60%) Tuesday and Tuesday night, through Wednesday, a good (50%) chance of rain Wednesday night, then cloudy with a good (50%) chance of rain Thursday highs 52-57 lows 35-38. (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 showers this evening, isolated showers with patchy fog late tonight (snow level 2,000 ft.),  AM fog, coastal rain likely Friday afternoon, a good (50%) chance of rain in the afternoon inland, and breezy (wind: S 15-25 mph), rain  Friday night and breezy (wind: S 15-25 mph), rain Saturday and Saturday night lows 38-40 highs 55-52.  Mostly cloudy with AM rain Sunday, showers likely (60%) Sunday afternoon through Tuesday night, then mostly cloudy with a good (50%) chance of rain Wednesday through Thursday highs 48-52 lows 37-40. (seasonal averages high 55 low 41).

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Forecast for the Cascades of Lane County:  Mostly cloudy with snow showers this evening,  and a slight (20%) chance of snow showers late tonight (1 in. of snow possible),  a mix of clouds and sun Friday AM, mostly cloudy with rain and snow in the afternoon,  rain and snow Friday night (6-12 in. of snow possible), rain and snow showers Saturday  AM, snow and rain likely (60%) Saturday afternoon (2-5 in. of snow possible) and Saturday night (4-7 in. of snow possible) snow level 2,500 ft. tonight,  4,500 ft. Friday, 4,000 ft. Friday night , then 3,500 ft. Saturday and Saturday night lows 25-30 highs near 38. Mostly cloudy with snow showers likely (60%) Sunday, a good (50%) chance of rain and snow showers Sunday night, snow likely (60%) Monday, snow showers likely (60%) Monday night and Tuesday, then snow and rain likely (60%) Tuesday night through Thursday  snow level 3,000 ft. Sunday and Sunday night, at the surface Monday through Tuesday, 3,000 ft. Tuesday night, and 3,500 ft. Wednesday, then 4,000 ft. Wednesday night and Thursday highs near 35 lows 27-22.

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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.