By late on October 15 , the surface circulation became defined well enough , with sufficiently organized deep convection , for the National Hurricane Center to designate the system as Tropical Depression Twenty-Four while it was located about 220 miles ( 350 km ) east-southeast of Grand Cayman .
By late on October 15 , the surface circulation became defined well-enough , with enough organized deep convection , for the National Hurricane Center to designate the system as Tropical Depression Twenty-Four while it was about 220 miles ( 345 km ) east-southeast of Grand Cayman .