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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 increased the winds once again as it sent a strong frontal system through Oregon. More frontal systems will be coming our way this week producing even more precipitation.

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Advisories:  A HIGH WIND ADVISORY IS IN EFFECT UNTIL 7 PM THIS EVENING FOR CENTRAL AND EASTERN LAKE 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 with showers likely (60%) tonight (0.10 in. of rain possible), rain Thursday (0.25 in. of rain possible), a good (50%) chance of showers Thursday night, patchy fog and a mix of clouds and sun Friday AM then mostly cloudy with a good (50%) chance of rain in the afternoon (0.10 in. of rain possible), rain Friday night (0.25 in. of rain possible) lows 33-38 highs 47-50. Showers likely (60%) Saturday, rain Saturday night, rain likely (60%) Sunday, a good (50%) chance of showers Sunday night, a (40%) chance of rain Monday and Monday night, then showers likely (60%) Tuesday, and rain likely (60%) Tuesday night and Wednesday highs 52-47 lows 35-30. (seasonal  averages high 54 low 36)

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Forecast for the Umpqua Basin including, Roseburg:  Mostly cloudy with rain and snow showers tonight and Thursday (snow level 2,000 ft., no snow accumulation expected),  a good (50%) chance of rain and snow showers Thursday night (snow level 2,000 ft. falling to 1,500 ft.),  a good (50%) chance of showers Friday (snow level 3,000 ft.), then rain Friday night (snow level 3,000 ft. rising to 3,500 ft. late) lows 42-35 highs 52-47.  Mostly cloudy with rain Saturday and Saturday night, rain likely (60%) Sunday, rain and snow likely (60%) Sunday through Tuesday, rain likely (60%) Tuesday night, then mostly cloudy with a good (50%) chance of rain Wednesday highs 50-57 lows 42-34. (seasonal averages high 57 low 38)

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Forecast for the South Oregon Coast including Coos Bay and North Bend: Cloudy with showers tonight and Thursday (snow level 2,000 ft.), mostly cloudy with a good (50%) chance of showers Thursday night (snow level 2,000 ft.),  a (40%) chance of showers Friday, rain likely (60%) in the afternoon, rain and breezy (wind: S 15-25 mph) Friday night lows 45-38 highs 52-47. AM rain Saturday, rain likely (60%) Saturday afternoon, rain Saturday night and Sunday, rain likely (60%) Sunday night through Tuesday night, then mostly cloudy with a good (50%) chance of rain Wednesday highs near 50 lows 42-36. (seasonal averages high 55 low 41).

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Forecast for the Cascades of Lane County:  Mostly cloudy with rain and snow showers tonight (2-5 in. of snow possible),  snow Thursday (3-6 in. of snow possible), and snow showers likely (60%) Thursday evening and a good (50%) chance of snow showers late at night (2 in. of snow possible),  partly cloudy with a good (50%) chance of rain and snow showers Friday AM, mostly cloudy with snow and rain in the afternoon, then rain with snow likely (60%) Friday night (6-12 in. of snow possible) snow level 2,500 ft. tonight through Thursday night, 3,500 ft. Friday, and 4,000 ft. Friday night lows 20-28 highs near 32. Mostly cloudy with rain and snow showers likely (60%) Saturday, snow and rain Saturday night, snow 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 and Wednesday snow level  3,500 ft. Friday, 4,000 ft. Friday night, 3,500 ft. Saturday, 2,500 ft. Saturday night, at the surface Sunday, 2,500 ft. Sunday night, at the surface Monday through Tuesday, 2,500 ft. Tuesday night, and 3,000 ft. Wednesday highs 35-30 lows 25-19.

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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.