Try this:
'Emirates pilot couldn't avoid Cumulonimbus cloud'- TIMESNOW.tv - Latest Breaking News, Big News Stories, News Videos
The CB's in this region can be very nasty especially this time of the year. I think the aircraft flew into the CB followed by excessive control inputs resulting in loss of control. I would fit the altitude loss between the bandwidth of 200-20000 to say a few thousand feet perhaps, unless things got out of hand in the flight deck, which is also a possibility given that these days the guys flying the 777, especially in the right seat don't quite comprehend what a rudder deflection at high altitude can do to a BIG JET. This could also be a good clue to what may have happened to AF447. Feel bad for the guys in the seat.