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. Some locations in the valleys will see 90 degrees or above before the end of next week as a result of that strong high pressure ridge.
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Advisories: A HEAT ADVISORY IS IN EFFECT FROM 10 AM WEDNESDAY UNTIL 9 PM THURSDAY FOR THE CENTRAL OREGON COAST, 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 much warmer (Hot) Wednesday, and mostly clear Wednesday night lows 52-56 high 95 . Mostly sunny and hot Thursday, and mostly clear at night high 96 low 56. A mix of clouds and sun and a bit cooler Friday through Tuesday, and mostly clear at night highs 90-86 lows 54-56. (seasonal averages high 80 low 50)
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Forecast for the Umpqua Basin including Roseburg: Clear tonight, sunny and much warmer Wednesday, clear in the evening and partly cloudy Wednesday night lows 62-64 high 100. Partly cloudy with isolated afternoon and evening thunderstorms Thursday through Friday night highs 99-93 low 63-60. Partly cloudy Saturday through Sunday, mostly clear Sunday night, then mostly sunny Monday and sunny Tuesday, and mostly clear Monday night highs 99 Thursday, 93 Friday, 90 Saturday, warming to 95 Sunday and Monday, near 92 Tuesday 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: Clear tonight, sunny and warmer Wednesday, mostly clear in the evening and partly cloudy Wednesday night lows 60-57 high 72. Partly cloudy Thursday through Sunday night highs 69-65 lows 58-53. AM clouds then sunny Monday, sunny again Tuesday, and mostly clear Monday night highs 69-65 low 55. (seasonal averages highs 66 low 52).
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Forecast for the Cascades of Lane County: Clear tonight, mostly sunny and warmer Wednesday, and mostly clear Wednesday night free air freezing level 14,000 ft. lows 56 high 82. Mostly sunny Thursday with a slight (20%) chance of afternoon and evening thunderstorms and partly cloudy at night free air freezing level 14,000 ft. falling to 13,000 ft. Thursday night high 85 low 62. A mix of clouds and sun Friday with a slight (20%) chance of afternoon and evening thunderstorms, partly cloudy at night free air freezing level 13,000 ft. high 84 low 60. Mostly sunny Saturday through Tuesday and mostly clear at night free air freezing level 13, 000 ft. rising to 14,000 ft. Sunday and 15,000 ft. Monday night and Tuesday highs 75-78 lows 60-63.
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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.