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Advisories: AN EXCESSIVE HEAT WARNING AND A RED FLAG WARNING ARE IN EFFECT THROUGH 9 PM TODAY FOR MOST OF WESTERN OREGON FROM THE COAST RANGE OF OREGON 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 THIS 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 today, then cooling, but more humid for the weekend as the ridge weakens and a low off the coast moves to the north. Thunderstorms are possible for late tonight and Saturday due to cooler air moving down from aloft.
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Forecast for the Umpqua Basin including Roseburg: Partly cloudy with patchy fog this AM, smokey with a slight (20%) chance of isolated thunderstorms this afternoon and tonight, mostly cloudy with smoke and a slight (20%) chance of thunderstorms Saturday AM, mostly cloudy and smokey in the afternoon, partly cloudy with areas of smoke late Saturday night, cloudy with areas of smoke Sunday AM, partly cloudy with more smoke in the afternoon and Sunday night highs 94-80 lows 62-54. Cloudy with patchy fog and areas of smoke 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: Cloudy with patchy coastal fog this AM, partly cloudy this afternoon and evening, cloudy with a slight (20%) chance of isolated thunderstorms late tonight, cloudy with patchy coastal fog Saturday AM, a slight (20%) chance of AM inland thunderstorms, cloudy in the afternoon, partly cloudy in the evening, cloudy Saturday night, mostly cloudy with patchy coastal fog Sunday AM, partly cloudy inland in the afternoon and evening, then cloudy Sunday night highs near 64 lows near 54. Cloudy with patchy AM fog Monday, then partly cloudy Monday afternoon through Thursday highs 62-65 lows near 54. (seasonal averages high 65 low 53).
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Forecast for the Cascades of Lane County: Mostly sunny this AM, partly cloudy with patchy smoke and a slight (20%) chance of thunderstorms this afternoon and evening, a (30%) chance of showers and a slight (20%) chance of thunderstorms late tonight, 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 (under 0.10 in. of rain possible), partly cloudy and cooler late Saturday night, partly cloudy Sunday AM, mostly sunny in the afternoon, then partly cloudy Sunday night free air freezing level 15,000 ft. today, snow level above 8,000 ft. tonight and Saturday, free air freezing level 13,000 ft. Saturday night and Sunday, then 14,000 ft. Sunday night highs 83-72 lows 62-45. 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 free air freezing level 13,000 ft. Monday through Tuesday night, then snow level above 8,000 ft. Wednesday through Thursday highs 69 lows near 46.
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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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