Summertime heat will stay with us for another day, then the cooling begins.

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Here is my weather weather quiz question for this week.  You have probably heard the term “fronts” used to explain the boundaries between cold and warm air masses. Who first coined that term?  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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Advisories: NONE AT THIS TIME.

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A  high pressure ridge (“Arch” shape) is letting us hold on to the sunny and warmer weather. An upper level trough of low pressure “U” shape) will build in from the Northwest toward the end of the week. A  cold front will approach the Pacific Northwest late Wednesday into Thursday (position shown is Thursday) bringing temperatures that are a bit cooler.

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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: Clear tonight, mostly sunny and still warm Wednesday, mostly clear Wednesday night, partly cloudy Thursday, mostly cloudy Thursday night and Friday AM, then partly cloudy Friday afternoon and night lows 50-54 cooling to 48 Friday night highs 88-72. Mostly sunny days and mostly clear nights Saturday through Monday, partly cloudy Monday night and Tuesday AM, then mostly sunny Tuesday afternoon highs near 77 cooling to 74 Tuesday lows near 50. (seasonal averages high 79 low 50)

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

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Forecast for the Umpqua Basin including Roseburg:  Clear this evening, mostly cloudy with patchy fog late tonight and early Wednesday AM, partly cloudy Wednesday afternoon and evening, mostly cloudy Wednesday night, patchy AM fog with a slight (20%) chance of drizzle Thursday, mostly cloudy with patchy fog late Thursday night, and early Friday AM, then partly cloudy Friday afternoon and Friday night lows 55-59 cooling to near 50 by Friday night highs 90-77. Patchy AM fog Saturday, partly cloudy Saturday afternoon through Sunday, partly cloudy with patchy late night and early AM fog, partly cloudy Monday, mostly clear in the evening, then partly cloudy Monday night and Tuesday highs near 80 lows near 52. (seasonal averages high 84 low 54)

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Forecast for the South Oregon Coast including Coos Bay and North Bend: Clear this evening, mostly cloudy at night with patchy coastal fog late night and early Wednesday AM breaking out to partly cloudy in the afternoon and evening, then mostly cloudy Wednesday night with patchy coastal fog again late at night, patchy fog with a slight chance of drizzle Thursday AM, mostly sunny in the afternoon, then partly cloudy with patchy fog Thursday night and early AM Friday, partly cloudy Friday afternoon and Friday night with patchy fog late at night lows 55-50 highs 67-63.  Patchy AM fog Saturday, partly cloudy in the afternoon, partly cloudy with patchy late night and early AM fog  Sunday and Monday, mostly clear in the evening, then partly cloudy Monday night and Tuesday highs near 64 lows near 52. (seasonal averages high 66 low 52).

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Forecast for the Cascades of Lane County: Clear tonight, mostly sunny Wednesday, mostly clear Wednesday night, partly cloudy Thursday through Friday AM, mostly sunny Friday afternoon, then mostly clear Friday night free air freezing level 15,000 ft. tonight and Wednesday, falling to 14,000 ft. Wednesday night and Thursday, 13,000 ft. Thursday night, 14,000 ft. Friday, then 13,000 ft. Friday night  lows 50-40 highs 78-64. Partly cloudy Friday AM breaking out to mostly sunny in the afternoon, mostly clear Friday night, then mostly sunny days and mostly clear nights Saturday through Tuesday free air freezing level 14,000 ft. Saturday and Saturday night, 13,000 ft. Sunday through through Monday, rising to 13,000 ft. Monday night and Tuesday highs 69-64 lows near 42.

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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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