Tom, if the storm threatens one of the ports of call on the day your cruise is scheduled there, that port call will either be canceled or the date switched. Captain's call, depending on the weather info and conditions at the time. There may be some rough seas due to the storm, but they won't sail you knowingly into a hurricane! Weather is one of the reasons the cruise documents always mention (in the small print, at least) that the cruise line has the right to change itineraries without notice.