(Peter?) Garrison, could a full tail stall develop with severe icing build-up (combined with an aft CG)....It seems the pitot tubes iced up...the met conditions were highly abnormal...is it feasible that there was also a failure of the tail de-icing system? Although I have to agree with Torquemada60: the Capt should not have left the FD with the impending CBs ahead and they should have made a larger diversion (fuel margins notwithstanding)