Heat kills by taxing the human body beyond its abilities. 175 people succumb to the demands of heat on an annual basis. In the disastrous heat wave of 1980, more than 1,250 people died.
Sunburn can significantly retard the skin's ability to shed excess heat.
Alcohol and certain medications can limit the ability to shed excess heat. NWS Forecasts which headline advisories and warnings. Slow down - reduce, reschedule or eliminate strenuous activity. Plan your activities to avoid the sun during the heat of the day. Get the victim out of the sun immediately.