A heat wave is a prolonged period of excessively hot weather, which may be accompanied by high humidity. It typically occurs when a high-pressure system traps warm air in an area, leading to temperatures significantly above average for that region. Heat waves can last for several days or even weeks, posing health risks, especially to vulnerable populations. During a heat wave, the risk of heat-related illnesses, such as heat exhaustion and heat stroke, increases. It is important for individuals to stay hydrated and avoid strenuous activities during extreme heat. Local authorities often issue warnings and provide resources to help people cope with the intense conditions.