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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 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 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 will strengthen to keep us hot through Friday, then cooling, but more humid for the weekend as the ridge weakens. Thunderstorms are possible for Saturday due to cooler air moving down from aloft.
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Forecast for the Umpqua Basin including Roseburg: Partly cloudy this AM, sunny and Hot this afternoon, mostly clear tonight, sunny Friday AM, partly cloudy with a slight (20%) chance of thunderstorms Friday afternoon and evening, then mostly cloudy with a slight (20%) chance of thunderstorms late Friday night through Saturday evening, then mostly cloudy late Saturday night highs 100-90 lows 62-56. Partly cloudy Sunday through Wednesday highs 83-80 lows near 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 with patchy coastal fog this AM, partly cloudy this afternoon, mostly clear inland tonight while mostly cloudy with patchy coastal fog late tonight and Friday AM, sunny inland in the AM, sunny in the AM and partly cloudy in the afternoon inland, partly cloudy in the evening, mostly cloudy with a slight (20%) chance of thunderstorms inland with patchy coastal late at night, cloudy with patchy AM coastal fog, partly cloudy with a slight (20%) chance of thunderstorms Friday afternoon, then partly cloudy with patchy fog land a slight (20%) chance of thunderstorms late Friday night, mostly cloudy Saturday AM, partly cloudy with a slight (20%) chance of thunderstorms inland in the afternoon, then mostly cloudy with patchy coastal fog Saturday night highs 60-64 lows 53-55. Mostly cloudy with patchy AM fog Sunday, sunny in the afternoon, then partly cloudy Sunday night through Wednesday highs near 64 lows near 54. (seasonal averages high 65 low 53).
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Forecast for the Cascades of Lane County: Mostly sunny and warmer today, mostly clear tonight, mostly sunny Friday AM, partly cloudy with a slight (20%) chance of thunderstorms Friday afternoon and 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, then a slight (20%) chance of thunderstorms late Saturday night free air freezing level 16,000 ft. today and tonight, 15,000 ft. Friday night, then snow level above 8,000 ft. Saturday and Saturday night highs 87-77 lows 62-49. Partly cloudy Sunday and Sunday night, mostly sunny with a slight (20%) chance of showers Monday afternoon and evening, mostly clear at night, mostly sunny Tuesday AM, partly cloudy Tuesday afternoon and Tuesday night, then mostly sunny Wednesday free air freezing level 13,000 ft. Sunday and Sunday night, snow level above 8,000 ft. Monday and Monday night, then free air freezing level 14,000 ft. Tuesday through Wednesday highs 73-70 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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