Final answer:
The danger of heat stroke significantly increases once the wet bulb globe temperature surpasses 31°C (87.8°F). This measurement takes into account various factors; when it is too high, the human body can struggle to cool itself, potentially resulting in heat stroke.
Step-by-step explanation:
The greatest risk for heat stroke typically arises when the wet bulb globe temperature (WBGT) exceeds the threshold of 31°C (87.8°F). WBGT considers factors such as temperature, humidity, wind speed, sun angle, and cloud cover. The body's normal temperature is about 37°C (98.6°F) and anything above this leads to discomfort, and when the WBGT exceeds about 31°C, it becomes tough for the body to cool itself which may result in heat strokes. The heat strokes can be more severe if the person is not acclimatizing to the rise in temperature.
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