 And the water vapor holds what we call latent heat, which means the heat that was required to convert it to vapor form. It maintains that energy. And when the water condenses or when the vapor condenses into water, it releases that energy and powers the storm. Now, there's another source of energy for storms called baroclinicity. And all that means it's the difference between cold air and warm air, basically, or cold, dense air and warm, moist air.