Significant ‘Heat Dome’ Builds Across Much of US, NWS Says

About 95 million people are under some form of advisory on Wednesday and Thursday, say federal forecasters.

A map of heat alerts issued by the U.S. National Weather Service, dated July 23, 2025, shows that tens of millions of Americans are currently under some form of heat-related advisory or warning. U.S. National Weather Service via The Epoch Times

A massive “heat dome” will bring long-lasting high temperatures across swaths of the United States starting this week, according to federal weather forecasters, who say that more than 80 million people are currently under some form of heat-related advisory as of Wednesday.

“Dangerous heat is expected” across portions of the southern and central United States through the end of this month, the National Weather Service (NWS) said on Wednesday in a message on its website.