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 THE CENTRAL 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: Sunny and much warmer (Hot) today, and mostly clear tonight high 95 low 60. Mostly sunny and hot Thursday, and mostly clear at night high 96 low 60. 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: Sunny and much warmer today with a slight (20%) chance of isolated afternoon and evening thunderstorms, mostly clear tonight high 100 low 64. 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 93 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: Sunny this AM and partly cloudy and warmer today, mostly clear in the evening and partly cloudy tonight inland and mostly cloudy with fog late at the shore high 68 low 57. Partly cloudy with patchy AM coastal fog Thursday, partly cloudy with evening thunderstorms then mostly clear with patchy fog late inland, while partly cloudy in the evening then clearing at the shore late, partly cloudy with patchy AM fog through Sunday night highs 65-70 lows 58-53. AM clouds then sunny Monday, mostly sunny 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: Sunny and warmer today, and mostly clear tonight free air freezing level 14,000 ft. high 82 low 57. Mostly sunny and very warm 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.