Hurricanes are large, powerful storms that form over warm ocean waters and bring strong winds and heavy rain. They can be over 600 miles wide with wind speeds ranging from 75 to over 200 mph. For a hurricane to form, certain conditions are needed including warm ocean water, converging winds, humid air that rises, and light winds outside the storm. Hurricanes cause significant damage by producing storm surges that flood coastal areas and raising sea levels. Safety tips during hurricanes include listening to reports and evacuating if warned to do so.