Plan on being cool for a while as the marine air washes Eastward over Oregon.

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Advisories: NONE AT THIS TIME.

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We have been under a blocking high pressure ridge (“Arch” shape covering the Pacific Northwest) that kept us under Easterly hot airflow. The airflow already switched a bit from the Northwest cooling us down even more than I expected for the Willamette Valley and even some drizzle or light sprinkles Tuesday AM. The ridge has weakened and will start moving Eastward away from us.  A frontal system will move in and that should cool us down even more with more fronts to follow over next 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 this AM, partly cloudy in the afternoon, mostly clear in the evening, mostly cloudy late tonight and Thursday AM, a mix of clouds and sun in the afternoon, partly cloudy Thursday evening and mostly cloudy late Thursday night and Friday AM, partly cloudy Friday afternoon and evening, then mostly cloudy Friday night highs 75-70 lows 48-44. A mix of clouds and sun Saturday, partly cloudy Saturday night through Sunday evening, mostly clear Sunday night, mostly sunny Monday AM, partly cloudy Monday afternoon through Tuesday highs 73-78 lows 46-49. (seasonal averages high 78 low 47)

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Forecast for the Umpqua Basin including Roseburg: Cloudy this AM, partly cloudy this afternoon, mostly clear in the evening, mostly cloudy with patchy fog late tonight and Thursday AM, mostly cloudy Thursday afternoon, partly cloudy in the evening, mostly cloudy with patchy fog late Thursday night and Friday AM, partly cloudy Friday afternoon, then mostly cloudy Friday night highs 80-75 lows 50-46. Mostly cloudy Saturday, then partly cloudy Saturday night through Tuesday highs 76-80 lows 46-52. (seasonal averages high 79 low 52)

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Forecast for the South Oregon Coast including Coos Bay and North Bend: Cloudy with patchy fog this AM, partly cloudy this afternoon and evening, cloudy with patchy fog late tonight, mostly cloudy with early AM and late night patchy fog Thursday through Friday night highs 63-66 cooling to near 60 Friday lows 50-45. Mostly cloudy Saturday and Saturday night, then partly cloudy Sunday through Tuesday highs 64-66 lows near 48. (seasonal averages high 65 low 50).

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Forecast for the Cascades of Lane County: Mostly sunny today, mostly clear in the evening, mostly cloudy late tonight and Thursday AM, a mix of clouds and sun Thursday afternoon, then mostly cloudy Thursday night and Friday AM, then partly cloudy Friday afternoon and Friday night free air freezing level 14,000 ft. today through Wednesday night, 13,000 ft. Thursday, then 11,000 ft. Thursday night through Friday night highs 67-62 warming to 68 Friday lows 47-40. Partly cloudy Saturday through Sunday AM, mostly sunny Sunday afternoon, mostly clear at night, mostly sunny Monday AM, partly cloudy in the afternoon and evening, mostly clear Monday night, mostly sunny Tuesday AM, then partly cloudy Tuesday afternoon snow level above 8,000 ft. Saturday through Sunday, free air freezing level 11,000 ft. Sunday night, 12,000 ft. Monday, then 13,000 ft. Monday night and Tuesday highs 65-72 Monday lows near 43.

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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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