Today’s heat waves feel a lot hotter than heat index implies

When the heat index was created nearly 45 years ago, it was a good measure of how hot it feels under increasing humidity. It still is. But with climate change, weather extremes are becoming more common, and the Heat Index can underestimate the apparent temperature and the physiological stress humans suffer. Scientists have now updated the index and found that the current index can underestimate apparent temperatures by as much as 23 degrees Fahrenheit.

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