Millions around the world suffered through long heat waves and deadly flash floods. But this isn’t a freak summer: It's occurring much more often.
Much of the South and Southern Plains faced a dangerous heat wave in July 2022, with highs well over 100 degrees for several days. Brandon Bell/Getty Images
At the same time, during a period of five weeks between July and August, five 1,000-year rainfall events occurred in St. Louis, eastern Kentucky, southern Illinois, California’s Death Valley and in Dallas, causing devastating and sometimes deadly flash floods. Extreme rainfall also led to severe flooding in Mississippi, Virginia and West Virginia.In Pakistan, record monsoon rains inundated more than one-third of the country, killing over 1,500 people.
A recent study published in the scientific journal Nature found that extreme flooding and droughts are also getting deadlier and more expensive, despite an improving capacity to manage climate risks. This is because these extreme events, enhanced by climate change, often exceed the designed levels of such management strategies.
Climate models showed these risks were comingMuch of this is well-understood and consistently reproduced by climate models. Some of these changes can create conditions such as persistent high-pressure systems and atmosphere blocking that favor more frequent and more intense heat waves. The heat domes over the Southern Plains and South in June and the West in September are examples.
Higher temperatures increase the atmosphere’s capacity to hold moisture at a rate of about 7% per degree Celsius.
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