Global warming. Hurricanes, typhoons and severe tropical cyclones form over warm ocean water, the warmer the air above the ocean the faster new air is sucked into the storm and the larger it grows and the faster the winds. With global warming increasing the temperature of the oceans more hurricanes are likely to develop in the future. https://youtu.be/VWCVohW5mD8
You might enjoy this Wikipedia article on [tropical cyclones](https://en.m.wikipedia.org/wiki/Tropical_cyclones_and_climate_change).
Tl;Dr: The number of tropical cyclones hasn’t changed that much, but the intensity of them has gone up.
“Tropical cyclones use warm, moist air as their source of energy or fuel. As climate change is warming ocean temperatures, there is potentially more of this fuel available.”.
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