Is climate change really making hurricanes worse?

“Several factors converged to make 2024 so fertile for tropical storms. Hurricanes feed on warm water, and the Atlantic Ocean and the Gulf of Mexico provided ample nourishment as they reached record-high temperatures. Wind shear — where air currents change speed and direction with altitude — tends to rip apart tropical storms before they can form hurricanes, but there was little of that this year due in part to the ripple effects of the shift to La Niña in the Pacific Ocean.”

“The world has already heated up by about 1.9 degrees Fahrenheit (1.1 degrees Celsius) since the dawn of the Industrial Revolution. There’s some evidence of this warming playing out in various hurricane traits, but there are also places where it’s absent.”

“scientists need more observations and more time to confirm whether climate change is having any influence on the number of hurricanes.”   

“the IPCC report does show hurricanes changing in ways beyond their overall numbers. One is that hurricanes in recent decades have likely been shifting toward the poles, farther away from their normal habitat in the tropics. That makes sense knowing that hurricanes need warm water, around 80 degrees Fahrenheit, so hotter oceans mean these storms can have a greater range.

Another changing trait is that hurricanes appear to be moving slower. That means the storms that make landfall spend more time parked over a given region, forcing the area to endure more wind and rainfall. Hurricane Harvey in 2017 was an exemplar of this as it sauntered along the Texas coast at 5 miles per hour and drenched Houston.

Rapid intensification is a climate change hallmark as well. This is where a tropical storm gains 35 miles per hour or more in windspeed in 24 hours. Hurricane Milton rapidly intensified from a tropical storm to a Category 5 hurricane with winds up to 180 miles per hour in just one day. The IPCC found that the global frequency of rapid intensification in tropical cyclones has likely increased over the past 40 years to an extent that can’t be explained by natural variability alone.

One of the strongest signals of climate change in hurricanes is rain. The average and maximum rainfall rates from hurricanes are increasing, largely a function of rising water and air temperatures. More recently, some researchers have begun to connect the increase in rainfall from individual hurricanes to climate change. The World Weather Attribution research group analyzed the rain from Hurricane Helene. They found the precipitation from the storm was 10 percent heavier due to climate change and that such extreme rain is now 40 to 70 percent more likely because of warming. Looking at Hurricane Milton, the researchers reported that heavy one-day rain events like those spawned from the storm are at least 20 to 30 percent more probable.”

https://www.vox.com/climate/378359/hurricane-climate-change-flood-helene-milton-warming

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