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Advisories: AN EXCESSIVE HEAT WATCH IS IN EFFECT FROM THURSDAY AFTERNOON THROUGH FRIDAY EVENING FOR MOST OF WESTERN OREGON FROM THE COAST TO THE CASCADE FOOTHILLS AND SOUTHEAST FROM FLORENCE THROUGH COTTAGE GROVE. A RED FLAG WARNING FOR DRY AND UNSTABLE WEATHER CONDITIONS, WITH LOW HUMIDITY THAT MAY RESULT IN EXPLOSIVE FIRE GROWTH FOR EXISTING FIRES, IS IN EFFECT FROM 1 PM THURSDAY THROUGH 9 PM FRIDAY FOR THE NORTH AND CENTRAL SECTIONS OF THE COAST RANGE OF OREGON.
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A high pressure ridge (“Arch” shape on brown line) has been building over us and allowed for hot weather. The high pressure ridge will strengthen for another round of increasing temperatures back to hot, then cooling, but more humid for the weekend .
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Forecast for the Umpqua Basin including Roseburg: Mostly clear tonight, partly cloudy Wednesday AM, sunny and Hot in the afternoon, clear Wednesday night, sunny and Hot Thursday, mostly clear Thursday night, sunny with a slight (20%) chance of thunderstorms Friday afternoon, partly cloudy in the evening and mostly cloudy late at night with a slight (20%) chance of thunderstorms late Friday night lows 59-65 highs 98-100 cooling (?) to 97 Friday. Mostly cloudy with a slight (20%) chance of thunderstorms Saturday and Saturday evening, partly cloudy late Saturday night and Sunday AM, sunny and cooler Sunday afternoon, mostly clear in the evening, partly cloudy late Sunday night through Tuesday AM, then sunny Tuesday highs 89-82 lows 57-54. (seasonal averages high 85 low 56)
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Forecast for the South Oregon Coast including Coos Bay and North Bend: Partly cloudy this evening and mostly cloudy inland tonight, mostly cloudy with patchy coastal fog late tonight and early Wednesday AM, sunny in the afternoon, mostly cloudy clear inland at night, mostly cloudy with patchy coastal fog late Wednesday night, partly cloudy with patchy coastal fog Thursday AM, sunny and warmer Thursday afternoon, mostly clear in the evening then partly cloudy late Thursday night with patchy coastal fog again, partly cloudy with patchy AM coastal fog with a slight (20%) chance of thunderstorms Friday, then partly cloudy with patchy fog late Friday night lows 54-58 highs 65-72. Mostly cloudy with patchy fog Saturday AM, partly cloudy with a slight (20%) chance of thunderstorms in the afternoon, and late night fog Friday and Friday night with a slight (20%) chance of thunderstorms, patchy fog Saturday AM, partly cloudy and cooler Saturday afternoon and evening, then just partly cloudy Saturday night through Tuesday highs 66-63 lows near 54. (seasonal averages high 65 low 53).
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Forecast for the Cascades of Lane County: Clear tonight, sunny and warmer Wednesday, clear Wednesday night, sunny and warmer Thursday, mostly clear Thursday night, mostly sunny Friday AM, partly cloudy with a slight (20%) chance of thunderstorms Friday afternoon and evening, then a slight (20%) chance of showers late Friday night free air freezing level 16,000 ft. tonight through Friday, then snow level above 8,000 ft. Friday night lows 56-63 cooling to near 54 Friday night highs 85-90. A mix of clouds and sun Saturday with a slight (20%) chance of thunderstorms in the afternoon and evening, partly cloudy with a slight (20%) chance of showers late Saturday night and Sunday AM, partly cloudy and cooler Sunday afternoon and Sunday night, mostly sunny with a slight (20%) chance of showers Monday afternoon and evening, mostly clear at night, mostly sunny Tuesday AM, then partly cloudy Tuesday afternoon snow level above 8,000 ft. Saturday, free air freezing level 15,000 ft. Saturday night through Sunday night, snow level above 8,000 ft. Monday and Monday night, then free air freezing level 14,000 ft. Tuesday highs 78-70 lows 49-44.
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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.
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