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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: A DENSE DOG ADVISORY IS IN EFFECT UNTIL NOON TODAY FOR ALL OF THE I-5 CORRIDOR FROM PORTLAND THROUGH THE EUGENE-SPRINGFIELD AREA. 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 dense fog this AM, a mix of clouds and sun this afternoon with some lingering areas of fog, then partly cloudy in the evening, mostly cloudy with patchy fog tonight and possibly dense fog again Thursday AM, then mostly cloudy with patchy fog again Thursday night highs 48-52 lows near 35. AM fog, mostly cloudy with a slight (20%) chance of rain Friday and Friday night, mostly cloudy with a (40%) chance of rain Saturday through Monday, partly cloudy Monday night, patchy late night and AM fog followed by a mix of clouds and sun Tuesday highs near 50 lows near 38 falling to 30 Monday night. (seasonal averages highs 48 low 33)
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Forecast for the Umpqua Basin including, Roseburg: Mostly clear with patchy fog this AM, partly cloudy this afternoon and tonight 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 high 56-59 lows 36-39. Mostly cloudy with a slight (20%) chance of rain Friday through Saturday, a slight (20%) chance of showers 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 59-50 lows 40-34. (seasonal averages high 51 low 35)
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Forecast for the South Oregon Coast including Coos Bay and North Bend: Sunny this AM, partly cloudy this afternoon and tonight and Thursday AM, sunny Thursday afternoon, mostly clear in the evening, and partly cloudy Thursday night highs 63-56 lows 39-42. Mostly cloudy with a slight (20%) chance of rain Friday and Friday night, mostly cloudy with a (40%) chance of rain Saturday and a (40%) chance of showers Saturday night, mostly cloudy Sunday and Sunday night with a (40%) chance of showers, then mostly 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: A mix of clouds and sun today, partly cloudy tonight, mostly sunny Thursday, and partly cloudy Thursday night free air freezing level 10,000 ft. today, 11,000 ft. tonight and Thursday, and 10,000 ft. Thursday night highs 47-50 lows 32-28. Mostly cloudy with a slight (20%) chance of rain Friday afternoon and Friday night, mostly cloudy with a (40%) chance of rain and snow Saturday, through Sunday night, partly cloudy with a slight (20%) chance of rain Monday, a slight (20%) chance of rain and snow Monday night, and a mix of clouds and sun Tuesday snow level 6,500 ft. Friday, 5,500 ft. Friday night, then 4,000 ft. Saturday through Sunday night, 4,500 ft. Monday and Monday night, then a free air freezing level of 7,000 ft. Tuesday highs 44-39 lows 30-23 warming to 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.