that has been baking the Southwestern United States, Mexico and Central America, a new flash study found.
There's just been no cool air at night like people are used to, Salazar Pérez said. Doctors say cooler night temperatures are key to surviving a heat wave."This is clearly related to climate change, the level of intensity that we are seeing, these risks," said study co-author Karina Izquierdo, a Mexico City-based urban advisor for the Red Cross and Red Crescent Climate Centre.
The changes we have seen in the last 20 years, which feels like just yesterday, are so strong," Otto said. Her study found that this heat wave is now four times more likely to happen now than it was in the year 2000 when it was nearly a degree cooler than now. "It seems sort of far away and a different world.
The study looked at a large swath of the continent, including southern California, Arizona, New Mexico, Texas, Oklahoma, Mexico, Guatemala, El Salvador, Belize and Honduras and the hottest five consecutive days and hottest five consecutive nights. For most of the area, those five days ran from June 3 to 7 and those five nights were June 5 to 9, but in a few places the peak heat started May 26, Otto said.
The attribution team used both current and past temperature measurements, contrasting what is happening to what occurred in past heat waves. They then used the scientifically accepted technique of comparing simulations of a fictional world without human-caused climate change to current reality to come up with how much global warming factored into the 2024 heat wave.
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