 When Tropical Depression Thirteen strengthened into Tropical Storm Luis on August 29 , it marked the earliest date on which the twelfth named storm of any season formed , surpassing the previous record set by Tropical Storm Twelve of the 1933 season . Shortly before becoming extratropical , Hurricane Luis was moving at 65 mph ( 105 km / h ) , becoming among the fastest Atlantic hurricanes in recorded history . On September 11 , a 30 metres ( 98 ft ) wave struck an ocean liner . This wave is the largest ever recorded , though Hurricane Ivan in 2004 may have produced a wave up to 40 metres ( 130 ft ) high off the coast of Mexico . 
