https://phys.org/news/2018-10-atlantic-hurricane-oscar-vapor-nasa.html

On Oct. 29 at 10:20 a.m. EDT (1420) NASA's Terra satellite passed over Oscar and provided visible and water vapor imagery of the newest Atlantic Hurricane.

Water vapor analysis of tropical cyclones tells forecasters how much potential a storm has to develop and shows where the heaviest rainfall may be found. Water vapor releases latent heat as it condenses into liquid. That liquid becomes clouds and thunderstorms that make up a tropical cyclone. Temperature is important when trying to understand how strong storms can be. The higher the cloud tops, the colder and the stronger they are.