A stronger  upper level High Pressure ridge (the “arch” shaped portion of the yellow lines) is over us and warmed us up quite rapidly. We did cool off a bit in the valleys yesterday. Most locations in the valleys will from near 90 to below 90 into the weekend as a result of that strong high pressure ridge moving . It will still be warm and dry this weekend for the Oregon Country Fair. A trough of low pressure will slide down from the Gulf of Alaska helping a cold front to drop down from the northwest Monday and cool us down a bit more.

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Advisories:   A HEAT ADVISORY IS IN EFFECT UNTIL 8 PM THIS EVENING FOR THE ENTIRE I-5 CORRIDOR FROM PORTLAND THROUGH EUGENE AND SOUTH TO COTTAGE GROVE, THE CASCADE FOOTHILLS (INCLUDING THE FOOTHILLS OF LANE COUNTY), AND THE UPPER HOOD RIVER VALLEY.

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The Updated Pollen Count Forecast for the Eugene-Springfield area : Trees LOW, Grass VERY HIGH, and weeds LOW. Data from Allergy and Asthma Research Group.

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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: Mostly clear tonight, mostly sunny and cooler Saturday, and partly cloudy Saturday night lows 56-55 high 86. AM clouds then a mix of clouds and sun Sunday, partly cloudy at night, a mix of clouds and sun and cooler Monday highs 87-80 low 54. Mostly clear Monday evening, mostly cloudy at night and Tuesday morning, then mostly sunny and cooler in the afternoon, and mostly clear Tuesday night lows near 50 high 76. Mostly sunny Wednesday through Friday and mostly clear at night highs 80-85 lows near 50. (seasonal averages high 80 low 50)

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Forecast for the Umpqua Basin including Roseburg:  Mostly clear tonight, sunny Saturday, clear in the evening, mostly cloudy with patchy fog at night and a slight (20%) chance of drizzle late at night,  AM clouds and fog Sunday, sunny Sunday afternoon, back to mostly cloudy with patchy fog late at night, AM fog and clouds with a slight (20%) chance of drizzle, then sunny Monday afternoon and mostly clear Monday night lows 62-56 highs 89-93-85. Mostly sunny Wednesday through Friday, and mostly clear at night highs 88-85 lows near 57-60. (seasonal averages high 84 low 54)

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Forecast for the South Oregon Coast including Coos Bay and North Bend:  Partly cloudy this evening, mostly cloudy tonight with patchy fog late, AM clouds and fog then mostly sunny Saturday, mostly clear in the evening, mostly cloudy with patchy fog and a slight (20%) chance of drizzle late at night late lows 55-57 high 65. AM clouds and fog with a slight (20%) chance of drizzle then sunny Sunday, partly cloudy in the evening, then mostly cloudy with patchy fog and a slight (20%) chance of drizzle late Sunday night, AM clouds and fog with a slight (20%) chance of drizzle, then sunny Monday highs 68-63 low 57. Partly cloudy with patchy late night and early AM fog Monday night through Wednesday morning, then sunny Wednesday afternoon, mostly clear Wednesday night lows 53-55 highs 66-63. Mostly sunny Thursday and sunny Friday, mostly clear Thursday night highs 65-66 low 56. (seasonal averages high 66 low 52).

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Forecast for the Cascades of Lane County:  A slight (20%) chance of isolated thunderstorm this evening South of Mt. Jefferson otherwise mostly clear tonight, mostly sunny Saturday and Sunday, mostly clear at night free air freezing level 13,000 ft. rising to 14,000 ft. Saturday night, and 15,000 ft. Sunday lows 56-50 highs 83-86. A mix of clouds and sun Monday and again Tuesday morning, sunny  Tuesday afternoon, while partly cloudy and cooler  Monday night and mostly clear Tuesday night free air freezing level 13,000 ft. Monday, 14,000 ft. at night, 13,000 ft. Tuesday and Tuesday night highs 76-70 lows 46-44. Mostly sunny Wednesday through Friday, and mostly clear nights mostly clear at night free air freezing level 12,000 ft. Wednesday, rising to 13,000 ft. Thursday through Friday highs 74-69-74 lows near 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.