My friend who managed our ops in TGU said the airport winds were 360@12 knots but the winds at the crash site were over 40 knots. That would produce a significant down draft on the south side of the hills. This may have contributed to going below their step down altitude. The captain was a friend of his.
I have experienced the very strong updraft on the north side turning final but expect the downdraft on the south side would be about the same. Maybe now they have the 02 VOR DME approach approved again but when I retired we needed the NDB bearing for final step down.