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Advisories: NONE AT THIS TIME.

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An upper level trough of low pressure (“U” shape) has moved through the Pacific Northwest, but a series of ripples in that flow will be followed by an even stronger low that will slide along the coast. That will keep us alternating between periods of  clouds and cooler temperatures, and even some light rain or drizzle, then back to some more sunshine and warming temperatures. A frontal system has pushed through the Pacific Northwest spreading showers throughout. Another frontal system approaches the coast Friday AM (position shown is Saturday) with clearing and warming behind it for the weekend.

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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: A mix of clouds and sun today, partly cloudy tonight through Friday night, partly cloudy with a slight (20%) chance of showers Saturday, mostly cloudy in the evening, then partly cloudy Saturday night highs 73-77 cooling to 73 Saturday lows near 50. Partly cloudy Sunday and Sunday night, a mix of clouds and sun Monday, then partly cloudy  Monday night through Wednesday highs 76-78 lows near 50. (seasonal averages high 82 low 51)

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The Pollen forecast for the Eugene/Springfield Area is for trees and weeds to be low, and Grass to be moderste. (Provided by Allergy and Asthma Research Group)

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Forecast for the Umpqua Basin including Roseburg: Mostly cloudy this AM, partly cloudy in the afternoon and evening, mostly cloudy late tonight, partly cloudy Friday and Friday evening, mostly cloudy with a slight (20%) chance of showers late Friday night through Saturday evening, just mostly cloudy Saturday night highs 76-79 lows 53-56. Mostly cloudy Sunday through Monday AM, then partly cloudy Monday night through Wednesday highs 81-86 cooling to near 80 Wednesday lows 56-52. (seasonal averages high 85 low 55)

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Forecast for the South Oregon Coast including Coos Bay and North Bend: Mostly cloudy this AM,  partly cloudy this afternoon, a slight (20%) chance of evening rain, mostly cloudy late tonight and Friday, a slight (20%) chance of coastal showers Friday night and a slight (20%) chance of inland showers late at night, mostly cloudy with a (30%) chance of showers Saturday, a slight (20%) chance of showers in the evening, mostly cloudy late Saturday night highs 63-66 lows 52-56. Mostly cloudy Sunday and Sunday night, mostly cloudy Monday AM, partly cloudy Monday afternoon through Wednesday highs near 65 lows 53-50. (seasonal averages high 67 low 53).

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Forecast for the Cascades of Lane County: Partly cloudy and warmer today through Friday night, partly cloudy with a slight (20%) chance of showers Saturday, then just partly cloudy Saturday night free air freezing level 9,000 ft. today and tonight, 10,000 ft. Friday, 11,000 ft. Friday night, snow level above 8,000 ft. Saturday, free air freezing level 12,000 ft. Saturday night highs 60-66 cooling to near 60 Saturday lows 40-42. Partly cloudy Sunday and Sunday night, partly cloudy Monday with a slight (20%) chance of showers, then just partly cloudy Monday night through Wednesday snow level above 8,000 ft. Saturday, free air freezing level 12,000 ft. Saturday night through Sunday night, snow level above 8,000 ft. Monday, free air freezing level 12,000 ft. rising to 13,000 ft. Monday night through Wednesday highs 66-70 lows 42-45.

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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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Get your local Eugene /Springfield news on-line at EugeneDailyNews.com.

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