Most people associate twisters with tornadoes, but in fact tropical twisters come from hurricanes.
They are formed when large areas of the ocean become heated, and the air pressure over that area drops. This causes thunderstorms and strong surface winds. As they travel long distances gathering energy from the ocean, they are likely to be classified as strong Tropical Cyclones. Each year on average, ten cyclones develop over the Atlantic Ocean, Caribbean Sea, or Gulf of Mexico. About six of these will strengthen enough to become hurricanes.