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Heat Waves - Summer - Temperature - Heat Index - Weather - New York Times: "The National Weather Service uses a heat index to calculate the temperature the body feels when heat and humidity are combined.
The danger zone begins at a heat index of 104 degrees, when, with prolonged exposure, sunstroke, heat cramps or heat exhaustion are likely, and when heat stroke, which can be deadly, is possible.
A heat index of 126 or higher is extremely dangerous. And it is not as hard to reach as it might sound. A temperature of 92 degrees with a relative humidity of 85 percent puts you there."
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