Heat stroke occurs when your body temperature reaches 104 degrees Fahrenheit or higher, and doesn't come down. Children and older adults are most susceptible to heat stroke.
Symptoms include a high body temperature, skin that's hot and dry to the touch (no sweating), nausea and vomiting, flushed skin, rapid breathing, racing heart rate, muscle cramps, and headaches and confusion. If anyone in your camping party experiences these symptoms, move them out of the sun and call 911 immediately. While waiting for help, remove any warm clothing and mist them with water or a fan. You can also place ice packs or cold towels on their head, armpits, neck and groin.