What happened
While descending through 11,000 feet on initial approach to Miami, Florida, the aircraft encountered turbulence. At the time of the encounter, the captain reported that the flight was crossing a narrow band of clouds. The aircraft was operating near a level two radar echo, and although no significant weather was visible on the aircraft's radar during the encounter, the captain observed a thunderstorm cell approximately 7 to 8 miles south of their position after exiting the clouds.
During the turbulence, a flight attendant was exiting the aft lavatory when she was lifted off the floor. Upon landing, she sustained one ankle injury. At the time of the incident, the flight attendant was wearing 2-inch high heel shoes. According to her statement, the seatbelt sign was illuminated and all passengers were seated; however, the cockpit crew had made no announcements instructing flight attendants to be seated.