– If you think it’s hot now, just wait. Across the globe, a pattern is emerging: Periods of extreme heat are on the rise. During these heat waves, high atmospheric pressure pushes air down, sometimes making it difficult
for other weather systems to move in and cool the area. This phenomenon allows sweltering heat to linger for days or even weeks. In the U.S., these periods
are expected to increase across hundreds of cities, raising what’s called the heat index. The heat index is a measurement
of the combined effects of temperature and humidity,
meaning on humid days, a temperature of 91 degrees Fahrenheit may feel more like 103. “This is fine.” – It’s estimated the
average number of days per year with a heat index
above 100 degrees Fahrenheit will more than double by
mid-century, and the number of days per year above 105 degrees will quadruple. Extreme heat is just one
sign of global warming.

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