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Here is my weekly weather quiz question for you. 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) still over the Pacific Northwest. The  computer models indicate a wet weather pattern will begin as another frontal system moves in from the Northwest for your Friday (position shown is still over the Pacific). 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 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 with patchy fog again tonight, mostly cloudy with patchy fog and a slight (20%) chance of rain Friday AM, mostly cloudy with a (30%) chance of afternoon rain (under 0.10 in. of rain possible), a (30%) chance of showers Friday night (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 with a slight (20%) chance of showers Sunday night lows 34-39 then falling to near 35 Saturday night and Sunday night highs near 50. A mix of clouds and sun Monday through Thursday with partly cloudy nights highs 53-49 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 late tonight and Friday AM, mostly cloudy with a slight (20%) chance of rain Friday afternoon and night, a good (50%) chance of rain Saturday (snow level 3,500 ft.),  rain likely (60%) Saturday night,  a (30%) chance of showers Sunday, then a slight (20%) chance of showers Sunday evening lows 38-34 high 53-49.  Partly cloudy Monday through Wednesday, mostly cloudy Wednesday night, and just partly cloudy Thursday highs 50-56 lows near 35. (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, mostly cloudy Friday with a (40%) chance of coastal rain and a slight (20%) chance inland, a (30%) chance of rain Friday night, a good (50%) chance of AM coastal rain 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 lows 44-36 highs near 52. Partly cloudy Monday through Wednesday, mostly cloudy Wednesday night, and just partly cloudy Thursday highs 52-55 lows 39-36. (seasonal averages high 53 low 40).

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Forecast for the Cascades of Lane County: Partly cloudy tonight, more clouds and cooler with a (40%) chance of rain (0.10 in. of rain possible) Friday afternoon (mainly North of Santiam Pass), a (30%) chance of showers and colder Friday night, 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 free air freezing level 11,000 ft. tonight, snow level falling from 7,000 ft. to 5,500 ft. Friday afternoon and Friday night, 4,000 ft. Saturday, 3,500 ft. Saturday night, 2,500 ft Sunday, and back up to 3,500 ft. Sunday night lows between 25 and 30 highs 44-34.  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 5,500 ft. Monday through Tuesday, 7,000 ft. Tuesday night, 6,000 ft. Wednesday and Wednesday night, and 5,000 ft. Thursday highs 40-44 lows 30-34.

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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.