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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 PM TODAY FOR THE NORTHERN COAST RANGE OF OREGON AND UNTIL MIDNIGHT TONIGHT FOR THE  CENTRAL COAST RANGE OF OREGON. A WINTER STORM WARNING IS IN EFFECT THROUGH 10 PM TODAY  FOR THE NORTH OREGON CASCADE FOOTHILLS,  THE NORTH OREGON CASCADES, AND THE UPPER HOOD RIVER VALLEY.  A WINTER STORM WARNING IS IN EFFECT UNTIL 6 AM TUESDAY FOR THE CASCADE FOOTHILLS IN LANE COUNTY AND THE CASCADES OF LANE COUNTY. A WINTER WEATHER ADVISORY IS IN EFFECT UNTIL 4 AM 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 WINTER WEATHER ADVISORY IS IN EFFECT UNTIL 4 PM THIS AFTERNOON FOR THE GREATER PORTLAND-VANCOUVER AREA AND THE WESTERN COLUMBIA RIVER GORGE AND UNTIL 5 PM THIS AFTERNOON FOR THE LOWER COLUMBIA-I-5 CORRIDOR.  A HIGH WIND WARNING IS IN EFFECT UNTIL 4 PM THIS AFTERNOON FOR THE SOUTH CENTRAL AND SOUTH OREGON CASCADES AND UNTIL 7 PM  THIS EVENING  FOR NORTHERN AND EASTERN KLAMATH COUNTY, WESTERN , 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 rain today (1 in. of rain possible),  rain tonight possibly mixed with snow down to 700 ft. (1-2 in. of snow possible), rain at times Tuesday (0.50 in. of rain possible), rain likely (60%) Tuesday night (0.25 in. of rain possible), rain Wednesday, then showers likely (60%) Wednesday night highs 44-49 lows 35-39. Mostly cloudy with showers likely (60%) Thursday and Thursday night, mostly cloudy with a (40%) chance of rain Friday, rain likely (60%) Friday night and Saturday, then mostly cloudy with a good (50%) chance of rain Saturday night and Sunday highs 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 and snow today (snow level 2,000 ft. in the afternoon, 1-2 in. of snow possible) and breezy (wind: SW 15-25 mph), 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 afternoon (snow level 2,000 ft. rising to 2,500 ft. in the afternoon),  rain likely (60%) Tuesday night (snow level 3,500 ft.), rain Wednesday, then rain and snow showers Wednesday night highs 46-53 lows 38-34. 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, then rain likely (60%) Saturday through Sunday highs 46-50 lows near 35. (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 today and windy (wind: SW 20-30 mph gusts to 50 mph), rain tonight and breezy (wind: SW 15-25 mph gusts to 40 mph), AM rain, rain likely (60%) Tuesday afternoon and evening, rain late Tuesday night and Wednesday, then showers Wednesday night highs 47-52 lows 43-38. Mostly cloudy with showers likely (60%) Thursday and Thursday night, rain likely (60%) Friday through Saturday, rain Saturday night, and rain likely (60%) Sunday highs near 48 lows near 39.(seasonal averages high 55 low 41).

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Forecast for the Cascades of Lane County:  Mostly cloudy with snow, heavy at times, today (10-18 in. of snow possible) and windy (wind:  W-SW 25-35 mph gusts to 50 mph in the afternoon), snow tonight (12-18 in. of snow possible), snow Tuesday (8-12 in. of snow possible), rain or snow Tuesday night (2-5 in. of snow possible), rain and snow Wednesday (2-5 in. of snow possible), then snow showers likely (60%) Wednesday night snow level at the surface today and tonight, 1,000 ft. Tuesday AM rising to 3,000 ft. in the afternoon, 4,500 ft. late Tuesday night, 5,000 ft. falling to 3,500 ft. Wednesday, and at the surface Wednesday night highs 30-37 lows 25-22. Mostly cloudy with snow showers likely (60%) Thursday and Thursday night, rain or snow likely (60%) Friday, rain or snow likely (60%) Friday night and Saturday, then snow or rain likely (60%)  Saturday night and Sunday snow level at the surface Thursday and Thursday night,  2,500 ft. Friday, 3,500 ft. Friday night, falling to 3,000 ft. Saturday, 3,500 ft. Saturday night, and 3,000 ft. Sunday highs 30-39 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.