The NWS warning was in effect for regions of the Grand Canyon below 4,000 feet elevation. Temperatures were forecast to potentially reach 110 degrees at Phantom Ranch and 102 at Havasupai Gardens.

Firefighters in Arizona were trying to contain a pair of fast-moving wildfires that destroyed a historic lodge in Grand Canyon National Park, closed a section of the park for the rest of the season and prompted calls for an investigation into federal authorities' wildfire response.

The Grand Canyon is vast, covering 1,218,375 acres and 1,904 square miles across Arizona. Here's what to know.

About 10 people die at the Grand Canyon every year, CBS affiliate KPHO reported. This is the second death at the park that the park service has reported this year. In May, a 74-year-old man died while attempting to hike from the canyon's South Rim to the North Rim, an approximately 24-mile distance.