Level 4 HeatRisk alert issued for over 30 million people in the Southeastern United States

"Extreme heat and humidity will affect large portions of the Southeastern United States from July 27 to 31, 2025, with over 30 million people under Level 4 Extreme HeatRisk alerts at the peak of the heatwave.
A long-duration heat dome is forecast to intensify over the Southeastern United States between July 27 and 31, placing over 30 million people under Level 4 Extreme HeatRisk alerts, the highest classification issued by the National Weather Service (NWS).
The heat dome, a persistent region of high atmospheric pressure that traps warm air at the surface, has already brought extreme heat conditions to the eastern half of the country." W