In all three cases, no cause of death has yet been released yet. The National Park Service is advising visitors to avoid hiking in the inner canyon during during daytime summer high temperatures.

Like other places, New Orleans has seen record numbers of people falling ill with heat-related conditions. First responders and hospitals race to respond with ice, fluids, and air conditioning.

Heat kills more people each year than tornadoes. Use this calculator to find your heat index and prepare for the week's weather.

Georgia will see more days of extreme heat as the climate continues to warm. A study by the advocacy group Union of Concerned Scientists finds that if...