The generation of a hurricane is complex, but ideally, it relies upon three elements, first is the need of warm water, at least 80 degrees; the second is the moist air; and ultimately, there is a need to converge winds for the formation of a hurricane.
The real procedure starts with a cluster of thunderstorms going through the ocean surface. When the surface of the water is warm, the storm sucks up the energy in the form of heat from the water, this develops moisture in the air. If the conditions of the wind are perfect, the storm turns into a hurricane.
This energy due to heat is the fuel for the storm. The warmer the water, the more moisture is in the air, which would suggest bigger and bigger hurricanes. Scientists utilize the temperature of the sea surface data from the satellites to assist in forecasting the intensity of storms.
Hurricane Katrina that was the third largest to make landfall in the United States, crossed over the Gulf waters, which exhibited temperatures between two or three degrees higher than usual.
This created winds to elevate over 140 mph, extending 100 miles from the eye of the storm. That is why the warming temperatures of the ocean matters; it's like supplementing fuel to a fire.