Flight Events
The captain anticipated weather during the first two hours of the flight. After leveling at flight level 330 (FL330), the aircraft was in clear weather, but light turbulence continued for a time. Once the turbulence stopped and no weather returns were visible on radar, the seat belt sign was turned off. However, the captain suggested to passengers that they keep their seat belts fastened. Approximately 15 minutes later—about 2 hours and 6 minutes after takeoff—the aircraft encountered severe clear air turbulence (CAT) without warning. The aircraft pitched, and the autopilot disconnected.
Injuries and Diversion
As a result of the turbulence, 35 occupants were injured. Three passengers sustained serious injuries, while 25 passengers and 7 flight attendants received minor injuries. The flight diverted to Miami, where the injured were treated.
Weather Conditions
A weather study found that the turbulence was encountered near the edge of the jet stream, where the aircraft had crossed about 6,000 feet over a cell or group of cells. Winds at that point were estimated from 260 degrees at about 55 knots. Moderate to severe turbulence had been forecast near rain showers and/or thunderstorms.