Original: Dvorak classifications began on October 14 , and by late October 15 the surface circulation in the system became well-enough defined , with sufficiently organized deep convection , for the National Hurricane Center to designate the system as Tropical Depression Twenty-Four while located about 220 miles ( 345 km ) east-southeast of Grand Cayman .
Simplified: By late on October 15 , the system was became strong for the National Hurricane Center to name it Tropical Depression Twenty-Four .