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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 will increase the winds once again as it sends a strong frontal system into Oregon today. More frontal systems will be coming our way this week producing even more precipitation.

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Advisories:  A HIGH WIND WARNING IS IN EFFECT UNTIL NOON  TODAY FOR  THE CENTRAL OREGON COAST AND UNTIL 2 PM TODAY FOR THE NORTH OREGON COAST. A HIGH WIND WARNING IS IN EFFECT UNTIL 4 PM THIS AFTERNOON FOR  NORTHERN AND EASTERN KLAMATH COUNTY, AND CENTRAL, EASTERN, AND WESTERN 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:  Showers today (0.25 in. of rain possible) and breezy (wind: SW  15-25 mph), showers likely (60%) tonight (0.10 in. of rain possible), showers likely (60%) Thursday (AM snow level 1,000 ft.) (0.10 in. of rain possible), a good (50%) chance of showers Thursday night (0.10 in. of rain possible) highs near 49 lows 35-32. Patchy AM fog, mostly cloudy with a good (50%) chance of rain Friday, rain Friday night and likely (60%) Saturday, cloudy with rain Saturday night, rain likely (60%) Sunday night, a (60%) chance of showers Monday and Monday night, then showers likely (60%) Tuesday highs 50-46 lows 39-33. (seasonal  averages high 54 low 36)

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Forecast for the Umpqua Basin including, Roseburg:  Mostly cloudy with rain today (snow level 3,500 ft. falling to 2,500 ft. in the afternoon) and breezy (wind: S 15-25 mph shifting SW 10-15 mph in the afternoon), rain and snow showers this evening then likely (60%) late tonight (snow level 2,000 ft. rising to 2,500 ft. late),  rain and snow showers Thursday (snow level 2,000 ft. in the afternoon),  a (40%) chance of rain and snow showers Thursday night (snow level 2,000 ft. falling to 1,500 ft.) highs 52-47 lows 42-35. Mostly cloudy with a good (50%)  rain Friday, rain likely (60%) Friday night through Saturday evening, rain late Saturday night, rain likely (60%) Sunday, then rain and snow likely (60%) Sunday night through Tuesday highs 54-50 lows 38-32. (seasonal averages high 57 low 38)

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Forecast for the South Oregon Coast including Coos Bay and North Bend: Cloudy with AM rain with showers this afternoon and evening and windy (wind: SW 25-35 mph at the shore and SW 15-25 mph inland), showers likely (60%) late tonight (snow level 2,000 ft. in the evening), AM showers Thursday, showers likely (60%) in the afternoon and evening breezy (wind: S 15-25 mph at the shore and SW 10-20 in the afternoon inland), a good (50%) chance of rain Thursday night (snow level 2,000 ft.) highs 52-47 lows 45-38. Mostly cloudy with a (40%) chance of rain Friday AM, rain likely (60%) in the evening, rain Friday night, then rain likely (60%) Saturday through Tuesday highs  near 48-50 lows 43-36. (seasonal averages high 55 low 41).

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Forecast for the Cascades of Lane County:  Mostly cloudy with rain and snow showers today (3-7 in. of snow possible) and windy (winds: SW 20-30 mph), rain and snow showers this evening, snow showers tonight (3-6 in. of snow possible),  snow showers Thursday (1-4 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) snow level 4,000 ft. falling to 3,000 ft. this afternoon, and 2,500 ft. tonight through Thursday night highs 36-32 lows 23-19. Mostly cloudy with a good (50%) chance of rain or snow Friday, then rain and snow likely (60%) Friday night and Saturday, snow Saturday night, snow likely (60%) Sunday, a a good (50%) chance of rain and snow showers Sunday night, then snow showers likely (60%) Monday through Tuesday snow level  3,500 ft. Friday, 4,000 ft. Friday night, 3,500 ft. Saturday, at the surface Saturday night and Sunday, 3,000 ft. Sunday night, and at the surface Monday through Tuesday highs 30-36 falling to 29 by Tuesday lows 20-27 cooling to near 20 by Tuesday.

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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.