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Here is my weekly weather quiz question for you 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 upper airflow shows a stronger high pressure ridge building over the Pacific Northwest, but a weak cold front is sliding down in front of it which brought clouds, but not much chance of  significant precipitation. The  ridge will protect us at least until next weekend when the computer models indicate a wet weather pattern may begin as another frontal system moves in. Remember that, particularly this time of the year, when it’s not raining it is usually fogging.

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Advisories:  AN AIR STAGNATION ADVISORY IS IN EFFECT FROM 4 AM TUESDAY UNTIL 4 PM SATURDAY FOR ALL OF THE I-5 CORRIDOR FROM PORTLAND SOUTH THROUGH EUGENE AND SPRINGFIELD,  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 this evening with a slight (20%) chance of showers, patchy fog late at night and early Tuesday AM, a mix of clouds and sun Tuesday afternoon, mostly cloudy in the evening,  partly cloudy with patchy fog again late Tuesday night and Wednesday AM, a mix of clouds and sun Wednesday afternoon, then partly cloudy with patchy fog Wednesday night lows 39-36 highs near 54. A mix of clouds and sun Thursday and Friday, mostly cloudy Thursday night, mostly cloudy with a (30%) chance of rain Friday night and Saturday, partly cloudy with a (40%) chance of rain Saturday night through Monday highs 58-49 lows near 37 falling to 28 Sunday night. (seasonal  averages highs 47 low 33)

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Forecast for the Umpqua Basin including, Roseburg: Partly cloudy this evening, mostly cloudy with patchy fog late tonight and early Tuesday AM, mostly sunny Tuesday afternoon, then mostly clear with patchy fog Tuesday night and Wednesday AM, partly cloudy Wednesday afternoon and night, patchy fog late night and early Thursday AM, partly cloudy Thursday afternoon and night with patchy fog late lows 40-36 high 55-58. Patchy AM fog Friday, partly cloudy in the afternoon, mostly cloudy Friday night, mostly cloudy with a (40%) chance of rain Saturday and Saturday night, mostly cloudy with a (40%) chance of showers Sunday and a slight (20%) chance Sunday night, then partly cloudy with a slight (20%) chance of showers Monday highs 50-53 lows 35-40. (seasonal averages high 51 low 35)

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Forecast for the South Oregon Coast including Coos Bay and North Bend: Partly cloudy this evening, mostly cloudy with patchy fog late tonight and early Tuesday AM,  mostly sunny Tuesday afternoon, mostly clear at night, mostly sunny in the AM,  partly cloudy Wednesday afternoon and Wednesday night lows near 40 highs 57-63. Patchy AM and late night fog and low clouds Thursday and Thursday night, mostly sunny Thursday afternoon, AM fog, then just mostly cloudy Friday and Friday night, mostly cloudy with a (40%) chance of rain Saturday and Saturday night,  mostly cloudy Sunday and Sunday night with a (40%) chance of showers, then partly cloudy with a (40%) chance of showers Monday highs 57-49 lows near 40. (seasonal averages high 53 lows near 40).

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Forecast for the Cascades of Lane County:  Partly cloudy with a (30%) chance of showers this evening,  a slight (20%) chance of showers late this evening, a mix of clouds and sun Tuesday, and mostly clear Tuesday night, mostly sunny Wednesday, and mostly clear Wednesday night snow level 6,000 ft. tonight, free air freezing level 9,000 ft. Tuesday, 10,000 ft. Tuesday night, and 11,000 ft. Wednesday and Wednesday night lows 29-33 highs 50-47. Mostly sunny Thursday, partly cloudy at night, a mix of clouds and sun Friday, then partly cloudy with a slight (20%) chance of rain Friday night and (40%) Saturday, partly cloudy with a (40%) chance of rain and snow Saturday night through Sunday night, then partly cloudy with a (30%) chance of rain Monday free air freezing level 11,000 ft. Thursday and Thursday night, 8,000 ft. Friday, snow level 6,000 ft. Friday night, then 5,500 ft. Saturday, 4,500 ft. Saturday night,3,500 ft. Sunday, and 5,500 ft. Sunday night and Monday highs 50-39 lows 30-23 warming to 28 Sunday night.

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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.