A stronger upper level High Pressure ridge (the “arch” shaped portion of the yellow lines over the Pacific) is moving toward us and will switch our airflow from onshore to offshore warming us up quite rapidly. Most locations in the valleys will see 90 degrees and above this week as a result of that strong high pressure ridge. It will cool a bit but still be very warm and dry this weekend for the Oregon Country Fair.
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Advisories: A HEAT ADVISORY IS IN EFFECT UNTIL 9 PM THURSDAY FOR THE COAST RANGE, 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 MODERATE, 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, sunny and very hot Thursday, and mostly clear at night, and mostly sunny and hot, but not quite as hot Friday lows near 65 highs 98 Thursday and 94 Friday. Mostly sunny Saturday through Wednesday, and mostly clear each night highs 84-88 and near 80 Wednesday lows 54-56. (seasonal averages high 80 low 50)
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Forecast for the Umpqua Basin including Roseburg: Mostly clear with a slight (20%) chance of isolated evening thunderstorms, sunny Thursday morning, then partly cloudy with isolated afternoon and evening thunderstorms Thursday through Friday and mostly clear at night lows 63-60 highs 99-93. Sunny Saturday AM, partly cloudy Saturday afternoon, and a slight (20%) chance of evening thunderstorms high 92 low 59. Partly cloudy Sunday, mostly sunny Monday and Tuesday, and mostly clear at night Sunday through Tuesday night, then sunny Wednesday highs warming to 93 Sunday and Monday, near 92 Tuesday, and cooling to 85 Wednesday lows near 60. (seasonal averages high 84 low 54)
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Forecast for the South Oregon Coast including Coos Bay and North Bend: Mostly cloudy tonight with patchy fog late at the shore, mostly clear this evening then partly cloudy tonight inland low 57. Mostly cloudy with patchy AM coastal fog Thursday, AM sun then partly cloudy with isolated afternoon and evening thunderstorms 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 highs 69-66 lows 52-55. AM clouds and fog then partly cloudy Saturday through Sunday night highs 65-68 lows 55-57. AM clouds then sunny Monday, mostly sunny Tuesday, sunny Wednesday and mostly clear Monday night and Tuesday night highs 69-66-70 lows 54-56. (seasonal averages highs 66 low 52).
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Forecast for the Cascades of Lane County: Clear tonight, mostly sunny Thursday and Friday, and mostly clear Thursday night and Friday night free air freezing level 14,000 ft. falling to 13,000 ft. Thursday night highs 88-84 lows 57-54. Mostly sunny Saturday through Wednesday and mostly clear at night free air freezing level 13, 000 ft. rising to 15,000 ft. Sunday and 15,000 ft. Monday through Wednesday highs hovering at or very near 80 lows 55-60.
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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.