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Since we have a winner here is my weekly weather quiz question one last tine. This is a technical question. What has a “Sling Psychrometer” been used for in weather prediction? Congratulations to Dan Kelly for being the first person to post the correct answer which follows. “A Sling Psychrometer is used to determine wet bulb and dry bulb temperature. WB and DB Temps are used to get relative humidity, and dew points. A change in Dew points can indicate arrival of a new air mass. A Sling Psychrometer consists of 2 thermometers, one is used as is, the other is covered with a muslin sleeve and the sleeve is saturated with water. The Sling Psychrometer is then twirled for several minutes, then both temperatures are read. that is why the name wet bulb and dry bulb.” I’ll have another weather quiz question for you starting next Monday. The first person to post the correct answer will win a week of free weather personalized forecasts tailored to your needs.
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A weak cold front is falling apart as it moves through eastern Oregon. An upper level High Pressure ridge (“Arch” shaped shaded area) will build up and protect us from any storms for a short while. Another large trough of low pressure (“U” shaded area over the ocean) will come in behind the ridge by late in the week. A cold front will be moving through the Pacific Northwest Friday bringing back more wet weather. Yet another frontal system will march through on Sunday.
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Advisories: A HIGH SURF ADVISORY IS IN EFFECT UNTIL 9 PM TONIGHT FOR THE NORTH AND CENTRAL OREGON COAST. A HIGH SURF WARNING IS IN EFFECT UNTIL 11 PM TONIGHT FOR THE SOUTH CENTRAL AND SOUTH OREGON COAST.
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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 tonight with areas of patchy fog this evening and late, early AM and late night fog then mostly sunny Wednesday (if the fog and low clouds clear out) and a mix of clouds and sun Thursday, increasing clouds with a (40%) chance of rain Thursday night lows 47-44 highs 68-64. Mostly cloudy with a good (50%) chance of rain Friday and Friday night, and likely (60%) Saturday, mostly cloudy with rain likely (60%) Saturday night through Sunday night, mostly cloudy with a good (50%) chance of showers and Monday night, and cloudy with a good (50%) chance of showers Tuesday highs 60-50 lows 40-45. (seasonal averages highs 57 low 38)
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Forecast for the Umpqua Basin including, Roseburg: Mostly clear tonight, patchy AM fog, sunny Wednesday, mostly clear with patchy fog late Wednesday night and Thursday AM, partly cloudy Thursday afternoon and evening, then mostly cloudy Thursday night lows near 47 highs 75-70. Cloudy with a slight (20%) chance of showers Friday, mostly cloudy with a good (50%) chance of showers Friday night, rain likely (60%) Saturday through Sunday night, mostly cloudy with a showers likely (60%) Monday, a (40%) chance of rain Monday night, and mostly cloudy with a (30%) chance of showers Tuesday highs 60-48 lows 44-49. (seasonal averages high 61 low 41)
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Forecast for the South Oregon Coast including Coos Bay and North Bend: Clear with patchy coastal fog late tonight and Wednesday AM, sunny Wednesday afternoon, partly cloudy with patchy coastal fog late Wednesday night and Thursday AM, partly cloudy Thursday afternoon, and mostly cloudy Thursday night lows near 50 highs 62-60. Cloudy with a(60%) chance of rain Friday, a good (50%) chance of showers Friday night, rain likely (60%) Saturday and Sunday, rain and breezy Saturday night, rain likely (60%) Sunday and Sunday night, and a good (50%) chance of showers Monday, a (40%) chance of rain Monday night, and a (40%) chance of showers Tuesday highs 57-50 lows 48-40. (seasonal averages high 59 lows 44).
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Forecast for the Cascades of Lane County: Mostly clear tonight, mostly sunny Wednesday, mostly clear Wednesday night, a mix of clouds and sun Thursday, and partly cloudy Thursday night free air freezing level 14,000 ft. tonight through Wednesday night, 13,000 ft. Thursday, 14,000 ft. in the evening and 13,000 ft. Thursday night lows 38-43 highs 59-63. Mostly cloudy with a (40%) chance of rain Friday to likely (60%) Saturday, rain likely (60%) Saturday night and Sunday, mostly cloudy with a (40%) chance of rain and snow Sunday night, and mostly cloudy with a (40%) chance of snow showers Monday through Tuesday snow level 8,000 ft. Friday, and 7,000 ft. Friday night, 6,000 ft. Saturday, and 7,000 ft. Saturday night, 6,000 ft. Sunday, snow level takes a dive to 4,000 ft. Sunday night, 3,000 ft. Monday, and 2,500 ft. Monday night and Tuesday highs 50-32 lows 36-24.
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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