united states, putting more than 150 million people in danger. miguel marquez has the latest on how some areas are preparing for a possible overflow of heat-related deaths. reporter: deadly heat. more than 30 states under alert. temperatures, record breaking. my god, this is hell on e earth. reporter: nowhere worse than phoenix, arizona. this is unreal. day, night, never seen anything like it. reporter: a city accustom to heat overwhelmed by it. a new record, 15 days so far this year, over 115 degrees. the mayor adding ten refrigerated containers preparing for heat-related deaths. the morgue is over its normal capacity. if it started to tilt, bad sign. reporter: arizona s ultra