Escape from disaster is hard. Climate Change is Hardening

(That doesn’t mean fire agencies like Calfire aren’t doing very well. Evacuating South Lake Tahoe is a success: more than 20,000 people were evacuated long before the fire reached the town’s edge.)

As with fires, one of the factors that causes hurricanes is heat. “Coastal waters are heating up significantly,” says Misra, of Florida State University. When Hurricane Ida moved across the Gulf of Mexico, it fed on warm water, causing strong winds as the storm hit the land.

Hurricanes are complex phenomena, of course, so there are other factors at play, such as the state of the atmosphere at a given time. Scientists need more data to fully understand the trend toward rapid acceleration. Warmer water, Misra says, “doesn’t necessarily mean that all the storms that land will be stronger than the last-minute storms. But that should certainly sound the alarm.”

Also, a warmer atmosphere should contain more moisture. “When convection occurs, under the right conditions, in today’s warm climate more moisture will come out of the same volume of air than the current climate,” Misra says. “So the threat of a tropical cyclone – whether it increases rapidly in the future more often – will be much more, with more rain coming out.” The wind of a hurricane is weakened by the landslides, as it is no longer fed by the warm waters of the gulf. But it still continues to rain as it moves inland, which could cause devastating flooding across southern and eastern states.

Hurricane forecasters can accurately predict the path of a storm earlier in the day by providing invaluable data to state and local governments to report evacuations; these models work and save countless lives. But climate change will create new challenges for new models as hurricanes change the way they behave. “Most weather forecasting models don’t do a lot of work to predict rapid acceleration,” Misra says. “So it’s a huge problem in itself to prepare to mitigate the impact of the hurricane.”

The current extreme harshness of natural disasters also makes it difficult for citizens to analyze their risk. “People set expectations based on their previous experiences, and those things are outside of people’s experiences,” says Ann Bostrom, a risk communications researcher at the University of Washington. “A hurricane or a fire that gets experienced is faster than people have experienced.” Someone who could have been quietly at home in one of these catastrophes 20 years ago — because they refused to leave or had no resources to do so — can now be in very serious danger.

Although the rapid acceleration of hurricanes is a danger to everyone, the worst is to get out quickly for those who do not have the resources. “A lot of people living on the coast are very rich or very poor,” says Kyle Burke Pfeiffer, director of the National Center for Analytical Preparation at Argonne National Laboratory. For the poor, he continues, “they may not have access to vehicles, or they may not have the funds or the ability to leave their jobs or home. Often, various hazards, such as hurricanes, live in structures not designed to support external loads.”

California has a similar problem: astronomical prices for coastal housing have pushed more people east to the state’s forest-city interface, where cities meet the forest. Paradise is one of those towns, as well as South Lake Tahoe. “More people come out in those areas [the areas are] it’s more dry to create more fires near communities, ”says Cova University of Utah. So fires start closer to town and move faster. “This affects evacuations because the time available can be below what you need, just like in Paradise.” Retirees, in particular, approach these places, but elderly residents with mobility problems will find it more difficult to evacuate as the fire approaches.