Tens of millions of people are under extreme heat warnings across central and southern parts of the United States on Sunday as high temperatures and severe humidity grip large swaths of the country for a second straight day.
Heat indices exceeding 105 degrees Fahrenheit (40.5 Celsius) were forecast from Memphis to Montana to Las Vegas. Parts of the southwest could see temperatures as high as 120 degrees Fahrenheit (49 C), according to the National Weather Service.
