Under ordinary circumstances, the process of rain production depletes clouds. The “sink rate,” or the rate at which water leaves a cloud, exceeds the supply of moisture arriving from the air and sea below, causing clouds to dissipate like ghosts returning to the afterworld. But hurricanes defeat this cycle. They use wind to harvest moisture and deliver it to their centers. As the wind races along the surface of the sea, it increases the rate of evaporation and captures spindrift and foam. The faster the wind blows, the more vapor it picks up and the more energy it transfers to the storm. The
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