“A heat advisory is when the heat index is 105 degrees or higher, but an extreme heat warning means the actual temperature is 105, or the heat index is 110 degrees or greater,” he says. Just five ...

A 67-year-old man from Texas died in the Grand Canyon during an extreme heat warning, rangers said. The man was found at about 11:50 a.m. July 8 on the South Kaibab Trail, below Cedar Ridge, the ...