Hurricanes are violent storms that can form over the warm waters of the oceans. The warm water heats the air above it.
Warm air rises, like steam from a teakettle.
The rising warm air creates an area of low pressure. Other air rushes toward the low pressure area from all directions, creating strong winds if the low pressure is low enough. The strong winds form the hurricane. This photograph from a weather satellite shows hurricane Erika. Hurricane Erika formed over the Atlantic Ocean in September, 1997.