What caused the severe turbulence on Singapore Airlines flight SQ321?

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Severe Turbulence on Singapore Airlines Flight SQ321 Attributed to an Air Pocket

Singapore Airlines flight SQ321 experienced severe turbulence due to an air pocket encountered approximately three hours before its scheduled arrival in Singapore from London. This sudden atmospheric phenomenon caused a dramatic drop, leading to one fatality and thirty injuries among passengers and crew. The Boeing 777-300R was subsequently diverted for an emergency landing in Bangkok.
Encountering an Air Pocket

The incident occurred when the aircraft, a Boeing 777-300R, encountered an air pocket. This event led to a sudden and significant decrease in altitude, often described as a "dramatic drop." Passengers who were not securely fastened in their seats were violently thrown towards the ceiling of the cabin.
Impact on Passengers and Cabin

The unexpected drop resulted in severe consequences for those onboard. Passengers and crew members not wearing seatbelts sustained injuries, with some hitting the overhead baggage compartments, lights, and masks. Reports indicate a significant number of spinal and head injuries, particularly affecting those who were in lavatories or standing at the time of the incident.
Diversion and Emergency Landing

Following the encounter with the air pocket and subsequent turbulence, the flight crew made the decision to divert to Bangkok for an emergency landing. Upon arrival in Thailand's capital, medical personnel and rescue workers attended to the injured. The evacuation process took approximately 90 minutes to complete.
Understanding Air Pockets and Turbulence

While the specific atmospheric conditions that create air pockets and severe turbulence can be complex, they are generally understood to be related to atmospheric instability. These phenomena can occur when there are significant variations in air pressure and temperature within the atmosphere, leading to rapid updrafts and downdrafts. Aviation meteorology closely monitors such conditions to ensure flight safety, though sudden and localized events can still pose challenges.

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What caused the severe turbulence on Singapore Airlines flight SQ321?

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