While we all know things on Earth are generally getting hotter, heat isn't the only factor influencing how hot we actually feel.
Due to changing environmental conditions and quirks of our physiology, heatwaves are feeling up to 10°C hotter than traditional measures imply, new research discovered.
Physicist Robert Steadman calculated the heat index scale in 1979 by measuring how different temperatures impact the blood flow in our skin under different levels of humidity. A temperature of around 30°C, for example, might seem more like 34.5°C. At elevated humidities, this disparity only worsens., even though it only reached temperatures other places in the world would consider fairly standard for summer.
And unfortunately for us, for every degree Celsius our atmosphere is warming, water vapor also increases byThe NSW relies on the heat index to issue public warnings on a regular basis, and researchers use it to estimate the physiological impacts of future warming. "Most of the time, the heat index that the National Weather Service is giving you is just the right value. It's only in these extreme cases where they're getting the wrong number,""When you start to map the heat index back onto physiological states and you realize, oh, these people are being stressed to a condition of very elevated skin blood flow where the body is coming close to running out of tricks for compensating for this kind of heat and humidity.
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