Original: Its transformation to a tropical system occurred over water cooler than 24 Â C (75 Â F), much colder than the 26.5 Â C (80 Â F) usually required for tropical development.
Simplified: It became a tropical storm the next day in water cooler than 24 Â C (75 Â F), colder than the 26.5 Â C (80 Â F) usually needed for tropical storms.