Heat kills more people in the U.S. each year than any other type of weather event.
. Over just the last two weeks, Spain and Portugal have collectively reported more than 1,100 heat-related deaths.
"The passive exposure, the classic heatstroke, is more [often in] vulnerable populations like children," said Michael Sawka, a physiologist at Georgia Tech’s School of Biological Sciences. People who experience heatstroke may ultimately stop sweating, she added, because the body can no longer regulate and cool its temperature.
After experiencing heatstroke, she said,"people are much more sensitive to further exposures to heat." Healthy people who experience heatstroke are usually physically active on days with intolerable wet-bulb temperatures, according to Sawka.In Ahmedabad, India, temperatures are consistently high, so authorities may not issue a heat alert under temperatures reach 105 degrees Fahrenheit, Knowlton said. But in New York City, she said, temperatures of 95 to 99 degrees Fahrenheit for at least two days are enough to constitute a health warning.
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