Sudden white-out when flying at 150ft agl then rolled-over after hitting the ground. Believed to be weather-related and not mechanical. Visibility in the area was reduced to 1.6 km by blowing snow and the temperature was -24 C – -38 C with the windchill. Occupants got out OK but then post-crash fire destroyed the aircraft and all survival equipment. CADAORS ref 2011C0797