HN-39
Apart from the ice particles that blocked the pitots, do you think that the weather played an important role in this accident?
At this point, without clear cut evidence on the accelerometers of a monster updraft, I don't think so. (But it was night IFR conditions)
Those that wish to add a large turbulence/updraft element to this loss of control seem to be putting unnecesary sauce on the stew. Occam's Razor applies.
There appears to be sufficient explanation in the pitch angle achieved to account for the climb to FL380.