Most of America's Lower 48 states are about to swelter under an unusually large, strong and long-lasting heat dome.
Heat waves like this one can put people at risk of heat exhaustion or the even more serious condition of heat stroke.
Here is what to watch out for if dehydration hits, as well as the best things to drink and eat to keep your body nourished.
Heat is the number one weather killer in the United States.
A man died of heat exposure in California's Death Valley National Park, marking the park's second heat death this summer, according to the National Park Service.
A 6-month-old boy died after he was left in a hot car for about seven hours, authorities said.