Overview
- On Monday, the National Weather Service and local agencies issued and extended Extreme Heat Watches and Warnings across the central and eastern U.S., with Southeast Wisconsin’s warning extended into the first days of July.
- Forecasters expect peak conditions midweek into the July 4 holiday, with heat indices frequently 100–115°F and overnight lows in the 70s that will limit cooling and raise cumulative heat stress.
- State and city officials have activated hot‑weather protocols, opened cooling centers and urged people to avoid outdoor activity during the hottest hours.
- Health authorities warn older adults, young children, outdoor workers, people with chronic conditions and anyone without air conditioning face the highest risk of heat exhaustion and heat stroke.
- Scientists link the breadth and intensity of the event to human-driven warming with El Niño raising odds of further extremes, and officials warn the heat could disrupt holiday events, sports fixtures and strained infrastructure.