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Advisories: AN EXCESSIVE HEAT WARNING AND A RED FLAG WARNING ARE IN EFFECT THROUGH 9 PM FRIDAY FOR MOST OF WESTERN OREGON FROM JUST INLAND OF THE NORTH COAST (NOT INCLUDING THE NORTH, CENTRAL OR SOUTH COAST) TO THE CASCADE FOOTHILLS AND SOUTH TO EAST OF FLORENCE THROUGH COTTAGE GROVE. A FIRE WEATHER WATCH IS IN EFFECT FOR ABUNDANT LIGHTNING AND DRY FUELS FROM FRIDAY AFTERNOON UNTIL SATURDAY EVENING FOR THE ENTIRE COAST OF OREGON EAST OF THE BEACHES UP TO THE FOOTHILLS OF THE OREGON COAST RANGE.
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A high pressure ridge (“Arch” shape on brown line) has been building over us and has allowed for hot weather. The high pressure ridge has strengthened to keep us hot through Friday, then cooling, but more humid for the weekend as the ridge weakens. Thunderstorms are possible for Friday night and Saturday due to cooler air moving down from aloft.
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Forecast for the Umpqua Basin including Roseburg: Partly cloudy with areas of smoke tonight, partly cloudy with patchy fog Friday AM, smokey with a slight (20%) chance of isolated thunderstorms Friday afternoon and Friday night, cloudy with patchy fog Saturday AM, partly cloudy with smoke and a slight (20%) chance of thunderstorms in the afternoon and evening, partly cloudy with areas of smoke late Saturday night, cloudy with patchy fog Sunday AM, partly cloudy with more smoke in the afternoon, partly cloudy in the evening, then cloudy with areas of smoke Sunday night lows 60-55 highs 96-85. Cloudy with patchy fog Monday AM, partly cloudy with more smoke in the afternoon, then partly cloudy Monday night through Thursday highs 80-77 warming to 83 Thursday lows 50-55. (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 cloudy with patchy coastal fog late tonight and Friday AM, partly cloudy inland tonight and Friday with patchy AM fog, partly cloudy in the afternoon inland, partly cloudy with a slight (20%) chance of inland thunderstorms late Friday night, cloudy with patchy fog Saturday AM, cloudy in the afternoon, partly cloudy Saturday night, cloudy with patchy fog Sunday AM, partly cloudy in the afternoon and evening, then cloudy Sunday night lows 53-55 highs 60-64. Cloudy with patchy AM fog Monday, then partly cloudy Monday afternoon through Thursday highs 62-65 lows 55-53. (seasonal averages high 65 low 53).
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Forecast for the Cascades of Lane County: Mostly clear tonight, mostly sunny Friday AM, partly cloudy with a slight (20%) chance of thunderstorms Friday afternoon and evening, a (30%) chance of showers and a slight (20%) chance of thunderstorms late Friday night, a mix of clouds and sun with a (30%) chance of showers and a slight (20%) chance of thunderstorms in the AM, a (30%) chance of thunderstorms Saturday afternoon and evening, a slight (20%) chance of thunderstorms and cooler late Saturday night, then partly cloudy Sunday and Sunday night free air freezing level 15,000 ft. tonight and Friday, snow level above 8,000 ft. Friday night through Saturday night, then free air freezing level 13,000 ft. Sunday and 14,000 ft. Sunday night lows 62-45 highs 86-72. Mostly sunny Monday, partly cloudy at night through Tuesday night, partly cloudy with a slight (20%) chance of showers Wednesday and Wednesday evening, partly cloudy Wednesday night, partly cloudy with a slight (20%) chance of showers Thursday afternoon snow level above 8,000 ft. Monday and Monday night, free air freezing level 13,000 ft. Tuesday and Tuesday night, then snow level above 8,000 ft. Wednesday through Thursday highs 70-68 lows 46-44.
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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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