A stronger upper level High Pressure ridge (the “arch” shaped portion of the yellow lines) is over us and warmed us up quite rapidly. Most locations in the valleys will be near 90 into the weekend as a result of that strong high pressure ridge. 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 early in the week helping a cold front to drop down from the northwest Tuesday and cool us down.
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Advisories: A HEAT ADVISORY IS IN EFFECT UNTIL 9 PM THIS EVENING FOR THE CENTRAL COAST RANGE OF OREGON. A NEW HEAT ADVISORY IS IN EFFECT UNTIL 8 PM FRIDAY 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: Clear tonight, and mostly sunny and hot, but not quite as hot Friday, mostly cloudy Friday night, mostly sunny and cooler Saturday, and partly cloudy Saturday night lows 56-50 highs 93-84. A mix of clouds and sun Sunday, mostly clear at night, sunny and cooler Monday highs 87-80 low 53. Mostly clear Monday evening, mostly cloudy at night and Tuesday morning, then mostly sunny and cooler in the afternoon, and partly cloudy Tuesday night lows 53-50 highs 84-79 . A mix of clouds and sun Wednesday, mostly clear at night, and mostly sunny Thursday highs 80-78 low 50. (seasonal averages high 80 low 50)
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Forecast for the Umpqua Basin including Roseburg: Mostly cloudy with scattered evening a (30%) chance thunderstorms and isolated thunderstorms overnight with possible high winds and heavy rain, sunny Friday AM then partly cloudy with isolated afternoon and evening thunderstorms lows 64-56 high 98. Partly cloudy Saturday through Sunday morning, sunny Sunday afternoon and cooler through Thursday, and mostly clear at night highs 96-88 lows near 57-64. (seasonal averages high 84 low 54)
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Forecast for the South Oregon Coast including Coos Bay and North Bend: Mostly cloudy this evening, isolated thunderstorms producing possible heavy rains and gusty winds, then mostly clear late inland, while partly cloudy with patchy fog at the shore late, partly cloudy Friday with patchy AM fog at the shore, mostly cloudy Friday night with patchy fog late at the shore lows 53-55 high 66. AM clouds and fog then partly cloudy Saturday, partly cloudy with patchy fog late at night late at the shore otherwise mostly cloudy at night high 67 low 55. Partly cloudy with AM and late night fog Sunday and Sunday night, AM clouds and fog then mostly sunny Monday, mostly clear in the evening and partly cloudy Monday night, AM fog then partly cloudy Tuesday through Wednesday highs 68-64 lows 55-52. Mostly clear Wednesday night then mostly sunny Thursday low 55 high 65. (seasonal averages highs 66 low 52).
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Forecast for the Cascades of Lane County: Mostly clear tonight except for isolated thunderstorms this evening south of Sisters, mostly sunny Friday through Sunday, mostly clear at night free air freezing level 13,000 ft. lows 58-50 highs 85-80-85. Sunny Monday and Tuesday, mostly sunny and cooler Wednesday and Thursday, and mostly clear nights mostly clear at night free air freezing level 15, 000 ft. Monday falling to 14, 000 ft. Monday and Monday night and to 14,000 ft. Tuesday and Tuesday night, 12,000 ft. Wednesday and Wednesday night rising to 13,000 ft. Thursday highs 81-70 lows 50-46.
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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.