Original: When Tropical Depression Thirteen strengthened into Tropical Storm Luis on August 29, it marked the earliest date that a seasons' twelfth named storm formed, surpassing the previous record set on August 31, 1933 when Tropical Storm Twelve formed near the Lesser Antilles. Luis spent a week as a major hurricane.
Simplified: When Tropical Depression Thirteen became Tropical Luis on August 29, it marked the earliest date of a seasons 12th named storm.