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What causes hurricanes?
- Tropical cyclones are projected to become more destructive over the coming century, with increased frequency of extreme rainfall events and higher potential intensity due to warmer oceans absorbing more than 90% of global warming heat.
- Climate models suggest the overall frequency of hurricanes may decrease slightly or remain stable, though storms making landfall are expected to grow larger and more powerful as warmer sea surface temperatures provide greater energy.
- Sea level rise driven by long-term secular climate change is anticipated to worsen storm surges, while slower-moving hurricanes may result in increased damage to human life through prolonged exposure.
- Extreme precipitation events are predicted to intensify; for instance, a hurricane with moisture levels comparable to Hurricane Harvey is estimated to be three times more likely in a warmer world.
- While no scientific consensus currently exists on the direct link between climate change and hurricane behavior, the underlying systems feeding storms are clearly influenced by global warming.
- Immediate adaptation and self-protection measures are essential, as active efforts to mitigate global warming will not reduce hurricane intensity within a human lifespan.
- Rebuilding efforts following such devastation can take years, with tropical cyclones currently costing an average of $22.4 billion per storm in the United States.
- The majority of hurricane-related fatalities occur due to water, including 90% of deaths overall and nearly half specifically from storm surges.
- Hurricane formation requires specific conditions including sea surface temperatures of at least 26.5°C to a depth of 50 meters, wind shear below a critical threshold, high relative humidity, and a latitude more than 5 degrees from the equator.
- Storm classification as a hurricane occurs once wind speeds reach 74 miles per hour, with maximum wind speeds capable of exceeding 200 miles per hour and generating storm surges capable of breaking levees, such as the eight-meter surge seen in Hurricane Katrina.
- Hurricanes dissipate upon moving over land where they lose their oceanic energy source, though surface wind shear can locally generate tornadoes and high wind shear aloft can tear the storm apart.