“The dangerous heat wave blamed for as many as 13 deaths spread into the eastern United States on Wednesday, extending its reach across nearly half the U.S. population, officials said.
About 141 million people in a 1 million-square-mile area were under heat advisories and warnings, Justin Kenney, spokesman for the National Oceanic and Atmospheric Administration, tweeted.”
Source: Nearly half U.S. population facing extreme heat – CNN.com