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Here is my weekly weather quiz question for you. Today is your last chance to win this week. Why are clouds white? It’s actually pretty easy. 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 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 another frontal system moves in from the West. A cold front will 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:   AN AIR STAGNATION ADVISORY CONTINUES TO BE IN EFFECT UNTIL 4 PM SATURDAY FOR CENTRAL DOUGLAS COUNTY, INCLUDING ROSEBURG, AND EASTERN CURRY COUNTY, JOSEPHINE COUNTY,  JACKSON COUNTY, THE KLAMATH BASIN, AND 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 a (30%) chance of showers tonight (under 0.10 in. of rain possible), a good (50%) chance of rain Saturday (0.10 in. of rain possible) and Saturday night (0.10 in. of rain possible), mostly cloudy with a (30%) chance of showers Sunday, a slight (20%) chance of showers Sunday night, partly cloudy with a slight (20%) chance of showers Monday, and partly cloudy Monday night lows 38-35 highs 53-47. 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: Mostly cloudy with a slight (20%) chance of showers tonight, patchy AM fog, mostly cloudy with a (30%) chance of rain Saturday (snow level 3,500 ft.), evening rain likely (60%)  then a good (50%) chance of rain late Saturday night (snow level 3,000 ft.),  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, partly cloudy with a slight (20%) chance of showers Monday, and partly cloudy with patchy fog late Monday night lows 39-32 high 56-49. 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 slight (20%) chance of showers tonight, a slight (20%) chance of AM coastal rain with afternoon rain likely (60%) Saturday, a good (50%) chance of rain inland, then rain likely (60%) Saturday night, a (40%) chance of showers Sunday and Sunday night, partly cloudy with a slight (20%) chance of showers Monday, and  just partly cloudy Monday night lows 45-33 highs 55-49. 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 and snow showers, mainly North of Santiam Pass, tonight a slight (20%) chance South, , a (40%) chance of rain and snow Saturday and a good (50%) chance Saturday night, a (40%) chance of rain and snow showers Sunday and Sunday night, partly cloudy with a (30%) chance of snow showers Monday, then just partly cloudy Monday night snow level falling from 6,000 ft. to 5,000 ft. late tonight,  5,000 ft.  Saturday, 4,000 ft. Saturday night, 3,500 ft Sunday, 3,000 ft. Sunday night, snow level at the surface Monday, and free air freezing level at the surface Monday night lows 30-20 highs 39-29.  A mix of clouds and sun Tuesday through Thursday with partly cloudy nights free air freezing level 2,500 ft. Tuesday,  3,500 ft. 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 38-45 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.