According to the written statement provided by the flight instructor, during the cross country flight they elected to divert due to thunderstorms building in the area. While on approach to runway 19, the helicopter encountered a wind gust (estimated to be 45 knots) and "lost tail rotor authority." The flight instructor immediately took control of the helicopter, from the student; however, the tail rotor struck the runway. The flight instructor was able to level and land the helicopter without further incident. The helicopter was examined by a Federal Aviation Administration inspector revealing that one frame tube was broken, the skid cross tube was bent, and a tail rotor blade was damaged. The flight instructor confirmed that there were no mechanical anomalies with the helicopter prior to the accident.