Henri737 and wallybird7,
There has been a back and forth conversation on this forum about whether they flew into a Cb.
I think perhaps the minimum level of agreement by parties engaged in this conversation is that AF 447, at night with the moon aft, flew into a cloud that had sufficient ice crystals at FL 350 to quickly clog the pitots. There is no consensus on the degree and duration of any turbulence encountered, nor of the existence of updrafts, etc. I believe there is consensus there was no lightning. I don't believe there is agreement on what kind of cloud in the ITCZ might produce ice crystals at FL 350.
Presumably, the next BEA report will soon enlighten us all.