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Advisories: AN EXCESSIVE HEAT WARNING IS IN EFFECT FROM 1 PM THURSDAY THROUGH 9 PM FRIDAY FOR MOST OF WESTERN OREGON FROM THE NORTH COAST (NOT INCLUDING THE CENTRAL OR SOUTH COAST) TO THE CASCADE FOOTHILLS AND SOUTH TO EAST OF FLORENCE THROUGH COTTAGE GROVE.
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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: Mostly clear this evening, partly cloudy late tonight and Thursday AM, sunny and Hot Thursday, mostly clear Thursday night, 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 night lows 62-56 highs 100-90. Partly cloudy Sunday through Wednesday AM, then sunny Wednesday afternoon 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: Mostly clear inland this evening and partly cloudy tonight, partly cloudy at the shore this evening then mostly cloudy with patchy coastal fog late tonight, partly cloudy with patchy coastal fog Thursday AM, partly cloudy in the afternoon, mostly clear inland Thursday night while mostly cloudy with patchy coastal fog late Thursday night 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 in the afternoon and evening, then mostly cloudy with patchy coastal fog Saturday night lows 53-55 highs 60-64. Cloudy with patchy fog Sunday AM, 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: Clear tonight, sunny and warmer Thursday, mostly clear Thursday night, 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 thunderstorms Saturday and Saturday evening, then a slight (20%) chance of thunderstorms late Saturday night free air freezing level 16,000 ft. tonight through Friday night, then 15,000 ft. Saturday and Saturday night lows 59-63 cooling to near 53 Saturday night highs 88-90 cooling to near 77 Saturday. Partly cloudy with a slight (20%) chance of thunderstorms early 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, partly cloudy Tuesday afternoon and Tuesday night, then mostly sunny Wednesday free air freezing level 15,000 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 76-70 lows 52-45.
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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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