Dozy:
Finally, there were theories doing the rounds (that ended up in the BBC/NOVA "Lost" documentary on AF447 back in 2009) that the thunderstorm cells were obscured on radar by a smaller cell in front of the cell they entered - what do you do in that situation if avoidance beomes impossible?
I just want to repeat that documentary was rubbish. Just reading the pilot's guide for the Wx radar on 447 would have given them real info about the radar capabilities. Instead, they went off on an ill-founded theory about the "storm behind the storm."