Heat waves

prolonged period of excessively hot weather

Hyperthermia, also known as overheating, is a condition in which an individual's body temperature is elevated beyond normal due to failed thermoregulation. The person's body produces or absorbs more heat than it dissipates. According to the International Emergency Medicine Education Project, severe hyperthermia (body temperature elevation of beyond ) "becomes a medical emergency requiring immediate treatment to prevent disability or death". Almost half a million deaths are recorded every year from hyperthermia.

air-conditioned space for protection from hot weather

extended period of anomalously warm water in a region of the oceans