Hurricanes require specific conditions to form. Warm ocean water, typically at least 80°F, provides the energy needed to fuel the storm. Additionally, a pre-existing weather disturbance, such as a tropical wave, is necessary to kickstart the process. Low wind shear, or the lack of significant changes in wind speed and direction with altitude, allows the storm to grow and organize. Finally, high humidity levels in the atmosphere help sustain the storm's development.