Climate change will expand the range of tropical hurricanes (cyclones) making millions more vulnerable, including those in cities like New York, Beijing, Boston and Tokyo. With warming, temperature differences between the equator and polar regions will decline, impacting the jet streams’ flow. Normally, they act as a kind of border guard, keeping hurricanes closer to the equator. Temperature rise means that kind of jet stream activity–happening in the middle latitude–will weaken and in extreme cases split, allowing hurricane formation to occur. On top of that, the proportion of intense tropical cyclones, average peak tropical cyclone wind speeds, and peak wind speeds of the most intense tropical cyclones will increase along with rising sea levels.
www.bbc.com/news/science-environment-59775105