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Sorry, no winner for my weekly weather quiz question this week. Here is the question for the last time. Why are clouds white? It’s actually pretty easy. Clouds are white because they reflect the light of the sun. Light is made up of colors of the rainbow and when you add them all together you get white. The sun appears a yellow color because it sends out more yellow light than any other color. Clouds reflect all the colors the exact same amount so they look white. I’ll have a new weekly weather quiz question for you starting Monday. 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.

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The jet stream shows a high pressure ridge (shaded “arch” shaped area with blue arrows) moving Eastward over the Pacific Northwest and a dip in the jet (a small trough of low pressure falling in behind it. The  computer models indicate a wet weather pattern will begin as a frontal system moves in from the west today. Another cold front will try to push down from the North Sunday night Monday with the potential of bringing some cold Arctic air with it. Remember that, particularly this time of the year, when it’s not raining it is usually fogging and we’ve had some pretty dense fog lately.

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Advisories: A HIGH SURF ADVISORY IS IN EFFECT FROM MIDNIGHT TONIGHT UNTIL NOON SUNDAY FOR THE SOUTH OREGON COAST (CURRY COUNTY COAST).

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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: After some serious morning sunshine it will become mostly cloudy with a good (50%) chance of rain today (0.10 in. of rain possible) and this evening, rain likely (60%) tonight (0.10 in. of rain possible), mostly cloudy with a (30%) chance of showers Sunday, a slight (20%) chance of showers Sunday evening, a mix of clouds and sun Monday, and partly cloudy Monday night highs 56-47 lows 37-25. A mix of clouds and sun Tuesday through Friday with partly cloudy nights highs 45-52 lows near 30-34. (seasonal  averages highs 48 low 34)

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Forecast for the Umpqua Basin including, Roseburg: Patchy AM fog, mostly cloudy with a (30%) chance of rain this afternoon, cloudy with a good (50%) chance of rain late tonight (snow level 3,000 ft.),  mostly cloudy with a (30%) chance of showers Sunday (snow level 3,000 ft. rising to 3,500 ft.), mostly cloudy with a (30%) chance of showers Sunday night, mostly cloudy with a slight (20%) chance of showers Monday (snow level 3,000 ft.), and partly cloudy with patchy fog late Monday night high 56-49 lows 39-32. Partly cloudy with patchy fog Tuesday, mostly clear Tuesday night, partly cloudy Wednesday, then partly cloudy with patchy fog Wednesday night through Friday highs 44-54 lows 30-37. (seasonal averages high 52 low 35)

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Forecast for the South Oregon Coast including Coos Bay and North Bend:  Mostly cloudy with a  (40%) chance of coastal rain with a (40%) chance of afternoon rain inland, then rain likely (60%) tonight, a (30%) chance of showers Sunday and a slight (20%) chance of showers Sunday night, mostly cloudy with a slight (20%) chance of showers Monday, and  just partly cloudy Monday night highs 52-49 lows 42-33. Partly cloudy Tuesday through Friday highs 48-55 lows 30-39. (seasonal averages high 53 low 40).

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Forecast for the Cascades of Lane County: Mostly cloudy with a (40%) chance of rain or snow today and a good (50%) chance this evening, rain or snow likely (60%) late tonight (2 in. of snow possible), a (40%) chance of  showers Sunday and a slight (20%) chance Sunday night, partly cloudy with a (30%) chance of snow showers Monday, then just partly cloudy Monday night snow level 4,500 ft. today, 4,000 ft. tonight, 3,500 ft. falling to 3,000 ft.  Sunday afternoon, 1,000 ft. Sunday night to 3,500 ft. near Willamette Pass, snow level at the surface Monday, and free air freezing level 2,000 ft. falling to the surface Monday night highs 42-29 lows 30-20.  A mix of clouds and sun Tuesday through Thursday with partly cloudy nights free air freezing level at the surface Tuesday and Tuesday night, 5,500 ft. Wednesday, 6,000 ft. Wednesday night, and 5,500 ft. Thursday, and 6,500 ft. Thursday night and Friday highs 36-45 lows 30-33.

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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.