A cloud shot up vertically like a plume of smoke in a matter of seconds before a Hawaiian Airlines flight last month hit severe turbulence and 25 people on board were injured, according to a preliminary report by the National Transportation Safety Board.

The captain of the 18 December flight from Phoenix to Honolulu told investigators that flight conditions had been smooth with clear skies when the cloud shot up in front of the plane and there was no time to change course, the report said.

He called the lead flight attendant and told her there might be turbulence. Within one to three seconds, the plane “encountered severe turbulence”, the report states.

Shortly afterward, the lead flight attendant told the crew there were multiple injuries in the passenger cabin.

four images of minor damge to plane and oxygen masks deployed
Mobile images, courtesy of a passenger, Jazmin Bitanga, show the interior of the plane. Photograph: Jazmin Bitanga/AP

Of the 291 passengers and crew on board, 25 were injured, including four passengers and two crew members who were seriously hurt, the report says. The plane sustained minor damage.

Tiffany Reyes, one of the passengers taken to hospitals, said the next day that she had just gotten back to her seat from the bathroom and was about to buckle her seatbelt when the flight dipped.

In an instant, Reyes said she found herself on the aisle floor, staring up at caved-in ceiling panels and a cracked bathroom sign that was hanging.

“I asked everyone around me, ‘Was that me?’” Reyes said. “They said I had apparently flown into the ceiling and slammed into the ground.”

Reyes said she initially thought something had hit the plane and it was crashing, and that they were going to die, because she had never encountered anything so violent on a flight.

“That’s the most terrifying experience I’ve been through in my whole 40 years of life,” Reyes said.

Hawaiian Airlines’ chief operating officer, Jon Snook, said at the time that such turbulence was unusual, noting that the airline had not experienced anything like it in recent history. The fasten-seatbelts sign was on at the time.

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