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Heavy rain fell in the Southern Willamette Valley Monday. Eugene set a record for the date with 1.75 in. of rain and I measured 1.65 in. of rain in my rain gauge at home.

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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 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 NOON TODAY FOR THE NORTHERN COAST RANGE OF OREGON AND THE UPPER HOOD RIVER VALLEY, AND UNTIL 11 AM FOR THE WESTERN COLUMBIA RIVER GORGE, AND UNTIL 4 PM FOR THE NORTH OREGON CASCADES FOOTHILLS AND THE NORTH CASCADES (NOT INCLUDING THE FOOTHILLS OR CASCADES OF LANE COUNTY). A WINTER WEATHER ADVISORY IS IN EFFECT UNTIL NOON TODAY FOR THE LOWER  COLUMBIA-I-5-CORRIDOR.  A WINTER WEATHER ADVISORY IS IN EFFECT UNTIL 10 AM TODAY FOR THE GREATER PORTLAND-VANCOUVER AREA. A HIGH WIND WATCH IS IN EFFECT FROM LATE TONIGHT THROUGH  WEDNESDAY AFTERNOON FOR THE NORTH AND CENTRAL OREGON COAST. A HIGH WIND WARNING IS IN EFFECT FROM 10 PM THIS EVENING UNTIL 10 PM WEDNESDAY FOR NORTH AND EASTERN KLAMATH COUNTY, CENTRAL, EASTERN, AND WESTERN LAKE COUNTY. A HIGH WIND WARNING IS IN EFFECT FROM 10 PM TONIGHT UNTIL 4 PM WEDNESDAY AFTERNOON FOR THE SOUTH CENTRAL AND SOUTH OREGON COAST. A HIGH WIND WARNING IS IN EFFECT FROM 10 PM THIS EVENING UNTIL 10 PM 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 occasional rain today (0.10 in. of rain possible), rain likely (60%) tonight (0.10 in. of rain possible), rain Wednesday (0.25 in. of rain possible) and breezy (wind: S 15-25 mph), then showers likely (60%) Wednesday night (0.10 in. of rain possible) highs 52-48 lows 39-35. 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 this AM, a (40%) chance of rain this afternoon (snow level 2,500 ft. rising to 3,000 ft. in the afternoon),  rain likely (60%) this 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) highs 53-47 lows 39-34. 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 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 AM rain, coastal rain likely (60%) this afternoon, a good (50%) chance of afternoon rain inland, and breezy (wind: S 15-25 mph), evening rain likely (60%), rain late tonight 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.) highs 52-49 lows 45-38 Wednesday night. 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 and rain today (1-4 in. of snow possible), rain and snow likely (60%) tonight (2-4 in. of snow possible) and breezy (wind: SE 5-15 mph increasing to S 15-25 mph gusts to 40 mph late), rain and snow Wednesday (1-3 in. of snow possible), then snow showers Wednesday night (1-4 in. of snow possible) snow level 3,000 ft. this AM rising to 3,000 ft. in the afternoon, 5,000 ft. late tonight, 5,000 ft. falling to 4,000 ft. Wednesday, and 4,000 ft. falling to 2,500 ft. Wednesday night highs 35-38-32 lows 30-24. 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.