Storms that form north of the equator spin counterclockwise. Storms south of the equator spin clockwise. This difference is because of Earth's rotation on its axis. As the storm system rotates faster and faster, an eye forms in the center. It is very calm and clear in the eye, with very low air pressure. read more
Hurricanes only form over warm ocean waters of about 80°F. This is why it is common in the tropics where temperatures are high all year round. Hurricanes also need wind action to form. read more