Over 110 million Americans are warned of extreme heat. In several places in the United States, Sunday is expected to be the warmest so far, according to NPR.
An extremely dangerous heat wave has built up over the southwestern United States that is likely to reach its peak on Sunday. This is written by the National Weather Service, which has issued warnings about extreme heat in several areas.
Around the country, local authorities are also urging people to seek cool places and check on their neighbours.