Hurricanes are large, swirling storms with very low pressure and winds between 75-200 mph that form over warm ocean waters. They rotate counterclockwise around an eye, which is the center of calm within the storm. When hurricanes make landfall, they can cause severe damage from high winds and heavy rain as well as storm surges, which are rises in sea level that can flood coastal areas. Hurricanes are monitored and categorized on a scale of 1 to 5 based on their wind speeds and potential for property damage.