Hurricane Iota, for a time a Category 5 storm with maximum sustained winds reaching 160 mph, wrought destruction over Central America less than two weeks ago. It was the latest and strongest in a series of hurricanes to rapidly intensify in the Atlantic basin – in what has also been the most active Atlantic hurricane season on record.
A tropical storm system is considered to have rapidly intensified when its sustained winds increase by 35 miles per hour or more within a 24-hour period. Sustained winds in Iota (and Hurricane Eta before it) increased some 80 miles per hour in just 24 hours!
The number of rapidly intensifying storms is increasing. It’s a troubling trend that scientist say is likely resulting in part from human-caused climate change. So what’s happening?
Warm water is the lifeblood for tropical storm systems. How strong a storm gets and how fast it strengthens depends largely on how warm the waters are along its path. And as our planet continues warming, so too do our oceans.
>> Learn more: Hurricanes and the Climate Crisis: What You Need to Know <<
These warmer-than-normal waters increase the probability of rapidly strengthening and generally stronger storms.
In the early 1980s, the odds of a rapidly intensifying storm were roughly 1-in-100. Now, it’s closer to 1-in-20. And most scientists don’t see this trend reversing anytime soon.
2020 Atlantic Hurricane Season by the Numbers (so far):
- 10 storms rapidly intensified
30 named storms
- Previous record: 28 named storms in 2005
12 named storms hit the US mainland
- Previous record: Nine named storms crossed the US mainland in 1916.
The Atlantic hurricane season is supposed to officially end today, November 30. But with continued above-normal water temperatures, this hyper-active stretch may continue well into December.
Is climate change really making weather more extreme? The simple answer is yes.
In our free e-book, Extreme Weather and the Climate Crisis: The Facts, we explain in plain language how burning fossil fuels is driving climate change and making our weather more intense and dangerous. We also share stories about how extreme weather is affecting people just like you, in their own words.
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