These warmer-than-average waters are, in part, the result of climate change. A new study published earlier this year in the Proceedings of the National Academy of Sciences by a group of NOAA and University of Wisconsin Madison researchers found that from 1979 to 2017, the odds that a given tropical cyclone would become a Category 3, 4 or 5 hurricane increased about 8 percent per decade as the planet has warmed.