Overview
- A Pacific upper-level trough moving inland this weekend is displacing a late-summer heat dome and lowering humidity across many Western and Northeastern communities, bringing cooler daytime highs and chillier nights.
- The trough will drive a wetter episode into the Pacific Northwest, with widespread rain Saturday night into Sunday and locally higher totals where heavier showers or a few thunderstorms develop.
- Central and South Florida will remain stormy through the weekend with high afternoon and evening rain chances, frequent lightning, training storms capable of isolated 3–4+ inch totals, and pockets of localized flash flooding.
- Extreme heat hazards persist in desert and parts of the Southwest through Friday with highs near 110–112°F, and Central Texas is forecast to return to triple-digit temperatures this weekend with heat-index values that could exceed 104–108°F.
- Forecasters say the pattern change eases heat stress and power demand in cooled regions, increases flood and lightning risks in Florida, and leaves the Atlantic basin quiet with the National Hurricane Center forecasting no tropical development over the next seven days.