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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. The  computer models indicate a wet weather pattern will begin as another frontal system moves in from the West-Northwest . 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 IS IN EFFECT UNTIL 4 PM TODAY FOR ALL OF THE I-5 CORRIDOR FROM PORTLAND SOUTH THROUGH EUGENE AND SPRINGFIELD.  AN AIR STAGNATION ADVISORY IS 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 patchy fog and a slight (20%) chance of rain this AM, mostly cloudy with a (30%) chance of afternoon rain (under 0.10 in. of rain possible), a (30%) chance of showers tonight (under 0.10 in. of rain possible), rain likely (60%) Saturday (0.10 in. of rain possible), a good (50%) chance of rain Saturday night (0.10 in. of rain possible), mostly cloudy with a (40%) chance of showers Sunday AM, a slight (20%) chance of afternoon showers, then partly cloudy Sunday night highs 56-50 lows 38-35. A mix of clouds and sun Monday through Thursday with partly cloudy nights highs 49-52 lows near 36-32. (seasonal  averages highs 48 low 34)

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Forecast for the Umpqua Basin including, Roseburg: Partly cloudy with patchy fog this AM, mostly cloudy with a slight (20%) chance of rain this afternoon and night, a good (50%) chance of rain Saturday, rain likely (60%) Saturday night (snow level 3,000 ft.),  a (30%) chance of showers Sunday (snow level 2,500 ft. rising to 3,500 ft.), then a slight (20%) chance of showers Sunday evening high 55-49 lows 39-34. Partly cloudy Monday through Wednesday, mostly cloudy Wednesday night, and just partly cloudy Thursday highs 50-56 lows 32-35. (seasonal averages high 52 low 35)

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Forecast for the South Oregon Coast including Coos Bay and North Bend:  Mostly cloudy today with a (40%) chance of coastal rain and a slight (20%) chance inland, a (30%) chance of showers tonight, a good (50%) chance of AM coastal showers 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 a slight (20%) chance of  showers Sunday evening highs 55-49 lows 45-35. Partly cloudy Monday through Wednesday, mostly cloudy Wednesday night, and just partly cloudy Thursday highs 50-55 lows 34-39. (seasonal averages high 53 low 40).

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Forecast for the Cascades of Lane County: A mix of clouds and sun today and cooler with a slight (20%) chance of rain and snow showers (0.10 in. of rain possible) this afternoon, a slight (20%) chance of showers and colder tonight, mostly cloudy with a (40%) chance of rain and snow Saturday and Saturday night, partly cloudy with a (40%) chance of rain and snow showers Sunday, and a (40%) chance of rain and snow showers Sunday night snow level falling from 8,000 ft. to 6,000 ft. this afternoon, 4,000 ft. tonight through Saturday night, 2,500 ft Sunday, and back up to 3,500 ft. Sunday night highs 44-34 lows 30-24.  A mix of clouds and sun Monday through Wednesday with partly cloudy nights, then partly cloudy with a slight (20%) chance of showers Thursday free air freezing level 3,500 ft. Monday and Monday night, 5,500 ft. Tuesday, 7,000 ft. Tuesday night, 6,000 ft. Wednesday and Wednesday night, and 5,000 ft. Thursday highs 35-44 lows 33-28.

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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.