Overview
- The multi‑day heat dome peaked this week with daily and multi‑decade temperature records set in cities from the Midwest into the I‑95 corridor, including readings of 100°F at New York’s Central Park and 104°F at Newark.
- World Weather Attribution published a rapid analysis on Friday, July 3, finding the observed heat and humidity would have been virtually impossible without warming from fossil fuel emissions, tying the event to long‑term climate trends and a strong El Niño signal.
- Electric grids and services have felt the pressure as officials reported voltage reductions, localized outages, and an Energy Department directive for large power users to switch to backup supplies to protect residential air conditioning.
- Cities and organizers have opened cooling centers, shortened or moved Independence Day events, and canceled some train routes while health officials warn that hot nights and high humidity raise the immediate risk of heat illness for older adults, children and outdoor workers.
- Forecasters expect some relief to spread from storms and cooler air beginning late this weekend in parts of the Northeast, but much of the central and eastern U.S. could remain hotter than normal into next week and the record‑warm global ocean temperatures add to long‑term risk.