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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. The  ridge will protect us at least through the end of the week 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 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: Cloudy with areas of patchy fog again late tonight and Wednesday AM, a mix of clouds and sun Wednesday afternoon, then partly cloudy in the evening, mostly cloudy with patchy fog Wednesday night and Thursday AM, then mostly cloudy with patchy fog again Thursday night lows near 35 highs 48-54. A mix of clouds and sun Friday, mostly cloudy Friday night, mostly cloudy with a (40%) chance of rain Saturday through Sunday night, mostly cloudy Monday, partly cloudy Monday night, and AM fog followed by a mix of clouds and sun Tuesday highs near 50 lows near 37 falling to 28 Sunday night and back up to 33 Monday night. (seasonal  averages highs 47 low 33)

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Forecast for the Umpqua Basin including, Roseburg: Partly cloudy this evening, then mostly clear with patchy fog tonight and Wednesday AM, sunny Wednesday afternoon, clear in the evening,  partly cloudy with patchy fog late night and early Thursday AM, partly cloudy Thursday AM, sunny in the afternoon, mostly clear in the evening, partly cloudy at night with patchy fog late lows 36-39  high 55-58. Mostly cloudy with a slight (20%) chance of rain Friday, mostly cloudy Friday night, mostly cloudy with a (40%) chance of rain Saturday and Saturday night, a (40%) chance of showers Sunday and a slight (20%) chance Sunday night, then mostly cloudy with a slight (20%) chance of showers Monday, and just partly cloudy Monday night and Tuesday highs 54-50 lows 40-35-35. (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 clear tonight, sunny in the AM,  partly cloudy Wednesday afternoon and Wednesday night and Thursday AM, sunny Thursday afternoon, mostly clear in the evening, and partly cloudy Thursday night lows 39-42 highs 63-56. Mostly cloudy Friday with a slight (20%) chance of rain, mostly cloudy 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 slight (20%) chance of showers Monday, partly cloudy Monday night, and mostly cloudy Tuesday highs 54-50 and back again by Tuesday lows 42-38. (seasonal averages high 53 low 40).

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Forecast for the Cascades of Lane County:  Mostly clear tonight, mostly sunny Wednesday and Thursday, mostly clear Wednesday night, and partly cloudy and colder Thursday night free air freezing level, 9,000 ft. tonight, and 10,000 ft. Wednesday, 11,000 ft. Wednesday night, 11,000 ft. Thursday, and 10,000 ft. Thursday night and  lows near 32 highs 47-50. A mix of clouds and sun Friday, partly cloudy with a slight (20%) chance of rain Friday night, partly cloudy with a (40%) chance of rain Saturday, mostly cloudy with a (40%) chance of rain and snow Saturday night through Sunday night, partly cloudy with a slight (20%) chance of rain Monday, partly cloudy with a slight (20%) chance of snow Monday night, and a mix of clouds and sun Tuesday free air freezing level 9,000 ft. Friday, snow level 5,500 ft. Friday night, then 5,000 ft. Saturday, 4,500 ft. Saturday night, 3,500 ft. Sunday, and 4,000 ft. Sunday night, 4,500 ft. Monday and Monday night, then a free air freezing level of 7,000 ft. Tuesday highs 44-39 lows 33-23 warming to 28 Sunday night and near 35 Monday 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.