If, however, there is a trough of low pressure or a remnant center of low pressure then as the air rises and forms clouds it slowly begins to rotate. Air moving into this counterclockwise rotation rises, forming clouds. As more air moves in and more clouds form the mass increases which increases the rotation. With increased rotation more air is pulled into the system and cloud mass increases. Increased cloud mass increases rotation, increases air flow, increasing cloud mass.
Hurricanes are feed-back systems.
If the water is cooler evaporation is not as efficient. If the depth of warm water is less than 200 ft then cold water from below will kill the developing hurricane. High humidity and high temperature. Necessary for evaporation and cloud development. Converging surface winds due to low pressure.