Overview
- The heat dome grew broader this weekend, placing roughly 70 million people under National Weather Service heat advisories, heat risk products, or Extreme Heat Warnings.
- Forecasters project daytime highs above 100°F from parts of Texas to the Northern Plains with local heat‑index values of about 105–115°F that threaten people without cooling or hydration.
- Local NWS offices have issued county‑level heat advisories and Extreme Heat Warnings in places including parts of the Plains, the Gulf Coast and California deserts, and officials are opening cooling centers and urging precautions.
- Nighttime lows are forecast to stay unusually high, reducing overnight recovery and raising the risk of heat illness for children, older adults and outdoor workers as heat stress builds over consecutive days.
- Scattered thunderstorms are expected to return late Sunday into Monday in several regions, creating a compound hazard of severe storms, heavy rain or gusty winds layered on top of ongoing extreme heat while utilities monitor grid and service strain.