Cool water can remove body heat 25 times faster than air. Avoid drinking alcohol. The index is a measure of the contribution that high humidity makes with abnormally high temperatures in reducing the body's ability to cool itself. For example, the index shows that for an actual air temperature of 100 degrees Fahrenheit and a relative humidity of 50 percent, the effect on the human body would be the same as 120 degrees. Sunstroke and heat exhaustion are likely when the heat index reaches 150.
Heat stroke is stroke are imminent.