Overview

• More than 132 million people across 29 states remain under heat advisories or warnings from the National Weather Service.
• Forecast heat index values range from 108°F to 116°F in hard-hit regions stretching from Nebraska to the Southeast coast.
• Federal and local health agencies have declared heat emergencies and advised residents to stay hydrated, seek air-conditioned spaces, and check on vulnerable neighbors.
• Grid operators including PJM Interconnection have issued hot weather alerts and are mobilizing to address surging electricity demand.
• Meteorologists expect a cold front to arrive Wednesday and bring cooler temperatures and lower humidity after several days of extreme heat.