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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 jet stream shows a high pressure ridge (shaded “arch” shaped area with blue arrows) 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 FRIDAY 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: Partly cloudy this evening, mostly cloudy with patchy fog late tonight and possibly dense fog again Thursday AM, a mix of clouds and sun in the afternoon, partly cloudy in the evening, mostly cloudy with patchy fog again Thursday night and Friday AM, mostly cloudy with a slight (20%) chance of AM rain, a (30%) chance of afternoon rain, then mostly cloudy with a (40%) chance of rain Friday night lows 34-38 highs 47-55. Mostly cloudy with a (40%) chance of rain Saturday through Sunday night, then a mix of clouds and sun Monday through Wednesday highs 53-49 lows near 38-30. (seasonal averages highs 48 low 34)
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Forecast for the Umpqua Basin including, Roseburg: Partly cloudy with patchy fog late tonight and early Thursday AM, sunny in the afternoon, mostly clear in the evening, partly cloudy at night with patchy fog late Thursday night and Friday AM, mostly cloudy with a slight (20%) chance of rain Friday afternoon and night lows 34-40 high 57-53. Mostly cloudy with a good (50%) chance of rain Saturday and Saturday night, showers likely (60%) Sunday, a slight (20%) chance of showers Sunday night and Monday, just partly cloudy Monday night and Tuesday, then mostly cloudy Tuesday night and Wednesday highs 50-52 lows 38-34. (seasonal averages high 52 low 35)
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Forecast for the South Oregon Coast including Coos Bay and North Bend: Partly cloudy tonight and Thursday AM, sunny Thursday afternoon, mostly clear in the evening, and partly cloudy Thursday night, mostly cloudy with a (30%) chance of rain Friday and Friday night lows 39-44 highs 59-53. Mostly cloudy with a (40%) chance of rain Saturday and a good (50%) chance Saturday night, showers likely (60%) Sunday, a (40%) chance of showers Sunday night, with a slight (20%) chance of showers Monday, partly cloudy Monday night, then just mostly cloudy Tuesday through Wednesday highs 50-54 lows 42-36. (seasonal averages high 53 low 40).
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Forecast for the Cascades of Lane County: Partly cloudy tonight, a mix of clouds and sun Thursday, partly cloudy Thursday night, more clouds and cooler with a (40%) chance of rain Friday afternoon, a slight (20%) chance of rain and colder Friday night free air freezing level 11,000 ft. tonight and Thursday, and 10,000 ft. Thursday night, snow level falling from 7,000 ft. to 5,500 ft. Friday afternoon, and 5,000 ft. Friday night lows 33-25 highs 56-44. Mostly cloudy with a (40%) chance of rain and snow showers Saturday and Saturday night, partly cloudy with a (40%) chance of rain and snow showers Sunday, a slight (20%) chance of snow showers Sunday night, then a mix of clouds and sun Monday through Wednesday with partly cloudy nights snow level 4,000 ft. Saturday, 4,500 ft. Saturday night, 4,000 ft. Sunday, 4,500 ft. Sunday night, then a free air freezing level of 6,000 ft. Monday and Monday night, 6,500 ft. Tuesday, 5,000 ft. Tuesday night, and 6,000 ft. Wednesday highs 36-43 lows 23-36.
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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.