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Sorry, no winner this week. Here is my weekly weather quiz question for the last time. What is a “halo?” Here is the correct answer. Sun dogs, halos, and rainbows are all due to the same basic physics: refraction of sunlight through moisture in the atmosphere. Refraction is the bending of light as it passes through a material, such as the lenses of your glasses. The difference between halos and rainbows is two-fold: the shape and the material that the light refracts through. To form a rainbow, light refracts through and reflects from a drop of water in the atmosphere which is approximately spherical. On the other hand, a halo forms from refraction through a hexagonal crystal of ice. The angle through which light refracts depends on the surface and material it refracts through, so the angle between the sun and the light phenomenon we see in the sky is different for rainbows and halos. I’ll have a new weekly weather quiz question for you starting Monday. Please remember to post your answer as a comment by clicking on “no comments /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.
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A high pressure ridge (shaded “Arch” shape) turned our airflow more from over the ocean (the term for that is flattening as it looses it’s hump), for more rain chances through the rest of the weekend because it is pumping subtropical moisture into the Pacific Northwest. A frontal system has moved in and will continue the rain for the rest of the weekend into next week. An upper level trough of low pressure will take over early next week continuing the wet weather pattern. A parade of frontal systems will inhance this weather pattern for your workweek including Halloween. Prepare your Trick-or-Treaters for the wet weather.
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Forecast for the Umpqua Basin including Roseburg: Cloudy with rain today (0.15 in. of rain possible) and this evening, rain likely (60%) late tonight (0.10 in. of rain possible), rain likely (70%) Monday (0.10 in. of rain possible) and Monday night (0.10 in. of rain possible), then mostly cloudy with rain Tuesday (0.20 in. of rain possible) and Tuesday night highs 67-65 lows 55-50. Mostly cloudy with rain Wednesday and Wednesday evening (Halloween), showers late at night, mostly cloudy with a (40%) chance of showers Thursday through Friday, cloudy with a good (50%) chance of showers Friday evening, a good (50%) chance of rain late at night, then rain likely (60%) again Saturday highs 62-56 warming to near 60 Saturday lows 44-42. (seasonal averages high 61 low 43)
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Forecast for the South Oregon Coast including Coos Bay and North Bend: Mostly cloudy with patchy AM fog and coastal rain today with AM rain inland then rain likely (60%) this afternoon (0.40 in. of rain possible), coastal rain with rain likely (60%) inland tonight (0.30 in. of rain possible) and Monday (0.35 in. of rain possible), coastal rain Monday night (0.35 in. of rain possible), evening rain inland and rain likely (60%) late at night, then mostly cloudy with rain Tuesday (0.90 in. of rain possible) and Tuesday night highs near 62 lows 56-52. Mostly cloudy with rain Wednesday and Wednesday evening (Halloween), showers late Wednesday night, mostly cloudy with a good (50%) chance of showers Thursday through Friday, then mostly cloudy with showers likely (60%) Friday night and Saturday highs 59-56 lows 48-45. (seasonal averages high 59 low 45)
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Forecast for the Cascades of Lane County: Mostly cloudy with rain today (1.00 in. of rain possible), occasional rain at night (0.75 in. of rain possible), rain Monday (0.50 in. of rain possible), mostly cloudy with rain likely (60%) Monday night (0.25 in. of rain possible) and Tuesday, then rain Tuesday night snow level above 8,000 ft. today through Tuesday night highs 54-49 warming to 54 Tuesday lows 42-36. Mostly cloudy with occasional rain Wednesday, rain likely (70%) Wednesday night (Halloween), a good (50%) chance of showers Thursday, mostly cloudy with a good (50%) chance of showers Thursday night, mostly cloudy with a good (50%) chance of rain Friday, cloudy with a good (50%) chance of rain at night, then mostly cloudy with a good (50%) chance of rain Saturday snow level 7,500 ft. Wednesday, 7,000 ft. Wednesday night, 6,500 ft. Thursday and Thursday night, 7,000 ft. Friday, 7,500 ft. Friday night and Saturday highs 47-43 warming to near 52 Saturday lows 34-30 warming to 35 Friday 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.
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