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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) pushing down toward the Pacific Northwest. A cold front is headed through Oregon and rain and wind are moving ahead of and with the front. More frontal systems will be coming our way this week producing even more precipitation.

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Advisories:  A WINTER STORM WARNING IS IN EFFECT UNTIL 6 AM TUESDAY FOR THE THE CASCADE FOOTHILLS IN LANE COUNTY AND THE CASCADES OF LANE COUNTY, AND UNTIL NOON TUESDAY FOR THE  NORTHERN COAST RANGE OF OREGON. A WINTER WEATHER ADVISORY IS IN EFFECT UNTIL NOON TUESDAY FOR THE LOWER COLUMBIA-I-5-CORRIDOR AND THE UPPER HOOD RIVER VALLEY.  A HIGH WIND WARNING IS IN EFFECT UNTIL 7 PM TUESDAY EVENING FOR NORTH AND EASTERN KLAMATH COUNTY, CENTRAL, EASTERN, AND WESTERN LAKE COUNTY. A WINTER WEATHER ADVISORY IS IN EFFECT UNTIL 4AM TUESDAY  ABOVE 2,500 FT. FOR EASTERN CURRY COUNTY, JOSEPHINE COUNTY, AND THE EASTERN DOUGLAS COUNTY FOOTHILLS. A WINTER WEATHER ADVISORY IS IN EFFECT UNTIL 4 AM TUESDAY ABOVE 4,000 FT. FOR THE SOUTH CENTRAL OREGON CASCADES.   A HIGH WIND WATCH IS IN EFFECT FROM TUESDAY EVENING UNTIL WEDNESDAY AFTERNOON FOR THE SOUTH CENTRAL AND SOUTH OREGON COAST. A HIGH WIND WATCH IS IN EFFECT FROM TUESDAY EVENING UNTIL WEDNESDAY EVENING FOR NORTH AND EASTERN KLAMATH COUNTY, 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: Mostly cloudy with rain tonight (1 in. of rain possible), rain at times Tuesday, decreasing in the afternoon (0.50 in. of rain possible), rain likely (60%) Tuesday night (0.25 in. of rain possible), rain Wednesday (0.25 in. of rain possible), then showers Wednesday night lows 36-39-35 highs 52-48. Mostly cloudy with showers likely (60%) Thursday and Thursday night, mostly cloudy with rain likely (60%) Friday through Monday highs hovering between 46-50 lows 34-37. (seasonal  averages high 53 low 36)

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Forecast for the Umpqua Basin including, Roseburg:  Cloudy with rain tonight (snow level 2,000 ft. rising to 2,500 ft. late), rain Tuesday AM, a good (50%) chance of afternoon rain (snow level 2,500 ft. rising to 3,000 ft.),  rain likely (60%) Tuesday evening, then rain late at night (snow level 3,500 ft. falling to 3,000 ft. late), rain Wednesday (snow level 3,500 ft. falling to 2,500 ft. in the afternoon), then rain and snow showers Wednesday night (snow level 2,000 ft. falling to 1,500 ft. late) lows 37-34 highs 53-47. Mostly cloudy with rain and snow showers likely (60%) Thursday and Thursday night, a good (50%) chance of rain Friday, rain likely (60%) Friday night and Saturday, rain Saturday night and Sunday, then rain and snow likely (60%) Sunday night and Monday highs 48-53 lows near 36. (seasonal averages high 57 low 37)

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Forecast for the South Oregon Coast including Coos Bay and North Bend: Mostly cloudy with rain tonight and breezy (wind: SW 15-25 mph gusts to 40 mph this evening), AM rain, coastal rain likely (60%) Tuesday afternoon, a good (50%) chance of afternoon rain inland,  and  breezy (wind: S 15-25 mph), evening rain likely (60%), rain late Tuesday night and Wednesday, windy Wednesday (wind: S 25-40 mph at the shore and S 20-25 mph inland),  coastal showers Wednesday night, evening showers then rain and snow showers late Wednesday night (snow level 1,500 ft.) lows 43-45 falling to 38 Wednesday night highs 52-49. Mostly cloudy with showers likely (60%) Thursday and Thursday night, rain likely (60%) Friday, rain likely (60%) and breezy Friday night and Saturday, rain Saturday night and Sunday, then rain likely (60%) Sunday night and Monday highs 48-50 lows  42-39. (seasonal averages high 55 low 41).

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Forecast for the Cascades of Lane County:  Mostly cloudy with snow tonight (8-12 in. of snow possible), rain or snow Tuesday (1-3 in. of snow possible), rain or snow likely (60%) Tuesday night (2-4 in. of snow possible), rain or snow Wednesday (2-5 in. of snow possible), then snow showers Wednesday night (4-6 in. of snow possible) snow level 2,500 ft. tonight, 3,000 ft. Tuesday AM rising to 3,000 ft. in the afternoon, 5,000 ft. late Tuesday night, 5,000 ft. falling to 4,000 ft. Wednesday, and 4,000 ft. falling to 2,500 ft. Wednesday night lows 25-30-24 highs 35-38-32. Mostly cloudy with showers likely (60%) Thursday and Thursday night, rain or snow likely (60%) Friday, a good (50%) chance of rain or snow Friday night, then rain or snow likely (60%)  Saturday through Monday snow level 2,000 ft. Thursday,  3,000 ft. Thursday night,  3,500 ft. Friday, 4,000 ft. Friday night through Saturday night, and 4,000 ft. Sunday and Sunday night, then 3,500 ft. Monday highs 30-39 falling to 33 by Monday lows 20-25.

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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.