On 5 December 2021 an Airbus A359-900 crew encountered a very brief episode of unexpected clear air turbulence associated with visible signs of convective weather in the vicinity and not having had prior warning, the senior cabin crew fell and was seriously injured. The Investigation concluded that the actual risk of turbulence prevailing and typical for the location and season as the end of daylight approached was greater than that perceived by the pilots despite their familiarity with the local area and its weather and that releasing the cabin crew from their previously secured positions had been inappropriate.