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 An Airbus A330 encountered severe turbulence while flying over the eastern coast of Greenland on 14 Nov 2024.  This The turbulence lay ahead forward of a sharp upper trough and was likely driven by mountain waves triggered by Greenland’s rugged orography.  Extreme vertical accelerations (decent -6800fpm and ascent 3800fpm) occurred and an in-flight shutdown of an engine was necessary followed by a return to Copenhagen.  The IFS turbulence index forecast (colour shading) correctly identified the hazardous area with lead time of 16 hours.Also shown are IFS forecast wind trajectories for the flight level, also altitude and vertical speeds experienced by the aircraft.. Forecast VT16UTC 14 Nov 2024; DT00UTC 14 Nov 2024

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