Rogue waves up to 100 feet tall are a spontaneous natural phenomenon that cannot easily be predicted. In 2005, the Grand Voyager of Iberojet Cruises was smacked by a wave that knocked out propulsion and communications systems and injured 20 passengers. In 2010, the Louis Majesty, operated by Louis Cruise Lines, was struck by 26-foot waves off the coast of France, smashing glass and killing two of the 1,400 passengers and injuring another 14.
Ship windows are being strengthened, and scientists are studying the prevalence of rogue waves across the ocean so that ships can be warned to avoid high-risk areas.
The unpredictable nature of these waves can make them difficult to forecast. Researchers are continuing to improve their methods, in the hope of one day developing a more accurate early-warning system.
Lack of reliable data. (Boldface emphasis mine.)
Which is a quite concise and informative narration. Off-hand I can't find anything to add or modify. I especially appreciate their stressing of the "unpredictable nature" of these waves and that they provided "Lack of reliable data" As the "Most common reason for failure", something one rarely finds in most scientific literatures. I hope someone in the scientific world would pay attention. One big thumb-up for the Conde Nast Traveler magazine!