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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 waffling back and forth as a cold front moving South and as a warm front moving back to the North  through Oregon and rain and wind are moving along with it. A strong low offshore will increase the winds once again. 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 FROM MIDNIGHT TONIGHT THROUGH  NOON WEDNESDAY FOR THE CENTRAL OREGON COAST. 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 FOR NORTH AND EASTERN KLAMATH COUNTY, AND CENTRAL, EASTERN, AND WESTERN LAKE COUNTY. A WIND ADVISORY IS IN EFFECT FROM 7 PM THIS EVENING UNTIL 7 AM WEDNESDAY FOR JACKSON 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: Becoming mostly cloudy this evening, more clouds with rain becoming likely (60%) tonight (0.10 in. of rain possible), AM rain Wednesday, showers and isolated thunderstorms (small hail possible) in the afternoon (0.25 in. of rain possible with higher amounts in thunderstorms) and breezy (wind: S-SW 15-25 mph gusts to 35 mph), showers with isolated evening thunderstorms, showers Wednesday night (0.25 in. of rain possible), showers likely (60%) Thursday with a slight (20%) chance of afternoon thunderstorms (0.25 in. of rain possible), a good (50%) chance of showers Thursday night (0.10 in. of rain possible) lows 40-34 highs 53-46. Mostly cloudy with rain Friday, rain likely (60%) Friday night and Saturday, cloudy with rain likely (60%) Saturday night through Sunday night, then rain likely (60%) Monday through 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 a (40%) chance of rain this evening, rain late at night (snow level 3,500 ft.), rain Wednesday AM then showers and isolated thunderstorms in the afternoon and evening (snow level 3,500 ft. falling to 2,500 ft. in the afternoon), rain and snow showers late Wednesday night (snow level 2,000 ft. rising to 2,500 ft. late),  AM rain and snow showers then rain and snow showers likely (60%) with isolated thunderstorms Thursday afternoon (snow level 1,500 ft. rising to 2,000 ft. in the afternoon), rain and snow showers likely (60%) Thursday evening, and a good (50%) chance of rain and snow late Thursday night (snow level 1,500 ft.) lows 42-35 highs 52-47. Mostly cloudy with a slight (20%) chance of AM rain and snow Friday, a (40%) chance of rain in the afternoon, rain likely (60%) Friday night through 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 evening coastal rain likely (60%) and a good (50%) chance of evening rain inland, rain late tonight and windy (wind: S 10-20 mph increasing to S 25-40 mph at the shore and S 10-15 mph increasing to S 20-30 mph this evening inland), AM rain with showers and isolated thunderstorms in the afternoon and evening Wednesday and windy (wind: SW 25-35 mph at the shore and SW 15-25 mph inland), showers late Wednesday night (snow level 2,000 ft. in the evening), AM showers Thursday, showers likely (60%) in the afternoon and evening with isolated thunderstorms, a good (50%) chance of rain Thursday night (snow level 2,000 ft. falling to 1,500 ft. late at night) lows 45-38 highs 52-47. Mostly cloudy with a (40%) chance of rain Friday, 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:  Partly cloudy this evening, more clouds with rain likely (60%) late tonight (2-5 in. of snow possible) South of Santiam Pass, mostly cloudy with rain likely (60%) late at night North of Santiam Pass, and breezy (wind: SE 5-15 mph increasing to S 15-25 mph gusts to 40 mph late), AM rain and snow Wednesday, showers in the afternoon (6-11 in. of snow possible), snow showers Wednesday night (6-10 in. of snow possible),  snow level  4,500 ft. rising to 5,000 ft. late tonight, 5,000 ft. falling to  3,500 ft. Wednesday afternoon, and 2,500 ft. Wednesday night, showers Thursday (6-10 in. of snow possible), and showers likely (60%) Thursday night (5 in. of snow possible) snow level 5,000 ft. tonight, 4,500 ft. falling to 3,500 ft. Wednesday  afternoon, and 2,500 ft. Wednesday night  through Thursday night lows 29-19 highs 36-32. Mostly cloudy with a good (50%) chance of rain or snow Friday, then rain or snow likely (60%) Friday night through Tuesday snow level 2,500 ft. Thursday and Thursday night,  3,500 ft. Friday, 4,000 ft. Friday night, 3,500 ft. Saturday, 3,000 ft. Saturday night,  3,500 ft. Sunday, 2,500 ft. Sunday night through Monday night, and 3,000 ft. 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.