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No winner this week. Here is my weekly weather quiz question for the last time. What is an “Omega High?” Here is the correct answer. An “Omega High” is a warm high aloft which has become displaced and is on the polarward side of the jet stream. It frequently occurs in the late winter and early spring in the Northern Hemisphere. The name comes from its resemblance to the Greek letter, Omega, when analyzed on upper air charts. It is an example of a blocking high. It prevents storms rom moving in under the umbrella of the high. I’ll have a new weekly weather quiz question for you staring 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. Good luck.
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An upper level high pressure ridge (Shaded “Arch” shape) kept the rain away has moved to the east. An upper level trough of low pressure (Shaded “U” shape) is bringing back the rainy weather as it replaces the ridge. A cold front passed through Oregon overnight and is already cooling the temperatures behind it. What looks to be a strong frontal system (position shown is Wednesday )will move through Tuesday continuing the chance of rain.
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Advisories: A FROST ADVISORY IS IN EFFECT FROM 1 AM UNTIL 8 AM MONDAY FOR THE NORTH OREGON COAST AND THE SOUTH CENTRAL OREGON COAST.
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Forecast for the Southern and lower Mid Willamette Valley including Eugene-Springfield and Albany-Corvallis: Patchy AM fog, a mix of clouds and sun and a bit cooler this afternoon, partly cloudy with patchy fog late tonight and Monday AM, mostly sunny in the afternoon, a good (50%) chance of rain late Monday night, mostly cloudy with rain Tuesday, then showers Tuesday night highs 50-54 cooling to 48 Tuesday lows 30-39 cooling 35 Tuesday night. Mostly cloudy with showers Wednesday, showers likely (60%) at night, a good (50%) chance of showers Thursday, partly cloudy Friday and Friday night, then partly cloudy with a slight (20%) chance of rain Saturday highs 48-55 lows near 37. (seasonal averages high 54 low 36)
Forecast for the Umpqua Basin including Roseburg: Mostly cloudy with patchy fog and a slight (20%) chance of AM rain and snow showers, partly cloudy this afternoon, mostly clear with patchy fog late tonight and Monday AM, partly cloudy Monday afternoon, mostly cloudy with a (40%) chance of at night (under 0.10 in. of rain possible), rain Tuesday and in the evening, then showers late Tuesday night highs 53-57 cooling to 53 Tuesday lows 33-38 cooling to 35 Tuesday night. Mostly cloudy with rain and snow showers Wednesday, rain and snow showers likely (70%) at night, a good (50%) chance of rain and snow showers Thursday, mostly cloudy with a (30%) chance of showers Thursday night, then partly cloudy Friday through Saturday highs 49-57 lows near 36. (seasonal averages high 56 low 38)
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Forecast for the South Oregon Coast including Coos Bay and North Bend: Mostly cloudy with a slight (20%) chance of AM showers inland, partly cloudy this afternoon, mostly clear this evening, partly cloudy with patchy fog late tonight and Monday AM, partly cloudy Monday afternoon, mostly cloudy with evening coastal and rain likely (70%) late at night while a good (50%) chance of inland evening rain and rain likely (70%) late Monday night, rain Tuesday, rain with a slight (20%) chance of thunderstorms in the evening, then mostly cloudy with showers and a slight (20%) chance of thunderstorms Tuesday night highs 50-54 cooling to 48 Tuesday lows 34-32 warming to 42 Monday night and cooling to 38 Tuesday night. Mostly cloudy with showers and a slight (20%) chance of thunderstorms Wednesday, showers likely (70%) Wednesday night and Thursday, mostly cloudy with a good (50%) chance of showers Thursday night, partly cloudy with a slight (20%) chance of showers Friday, just partly cloudy at night, then mostly cloudy with a slight (20%) chance of rain Saturday highs 48-54 lows near 39. (seasonal averages high 54 low 41)
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Forecast for the Cascades of Lane County: A slight (20%) chance of AM snow showers, a mix of clouds and sun and colder this afternoon, partly cloudy in the evening, clear late tonight, mostly sunny and just a bit warmer Monday, mostly cloudy with a good (50%) chance of rain and snow late Monday night, rain and snow Tuesday, then rain and snow showers Tuesday night free air freezing level at the surface today, 4,000 ft. falling to the surface late tonight, 6,500 ft. falling to 5,000 ft. Monday afternoon, snow level 5,000 ft. Monday night, 4,000 ft. Tuesday, then 3,500 ft. Tuesday night lows 24-28 cooling to 24 Tuesday night highs 36-44 cooling to 35 Tuesday. Mostly cloudy with rain and snow showers Wednesday, rain and snow showers likely (60%) Wednesday night, a good (50%) chance of snow showers Thursday, a good (50%) chance of rain and snow showers Thursday night, a mix of clouds and sun with a slight (20%) chance of rain and snow showers Friday, just partly cloudy Friday night, then a mix of clouds and sun Saturday snow level 3,000 ft. Wednesday and Wednesday night, 2,500 ft. Thursday, 3,000 ft. Thursday night and Friday, free air freezing level 5,500 ft. Friday night, then 5,000 ft. Saturday highs 35-42 lows 22-26.
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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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