Originally Posted by
RifRaf3
That's one credible scenario to account for the 2000' odd overshoot of assigned altitude and the eventual stall. You often get temp changes in CBs, however it could also be sensor icing and autopilot pitchup or pilot error. There's not enough data yet to factor out all the possibilities.
Enter an updraft which by definition has higher temperature than the surroundings and is already carrying you up fast and then the aircraft does an 'assist' by climbing at 6000fpm inside the updraft. All IMC.