The birth of a hurricane requires at the very least three conditions. First, the oceans must be adequately warm on the surface to get enough moisture and heat into the overlying atmosphere to offer the possible fuel with the thermodynamic engine that the hurricane becomes. Second, atmospheric moisture from sea water evaporation must combine with that heat and energy to the powerful engine required to propel a hurricane. Third, a wind pattern has to be at the ocean surface to spirals air inward. Bands of thunderstorms form, allowing the environment to warm further and rise higher into the atmosphere. If the winds at these higher levels are relatively light, this structure can remain intact and grow stronger: the beginnings of a hurricane!