Background
According to the pilot, his weather information came solely from a weather radio heard in the local area. Prior to departure, conditions included strong winds with scattered to broken cumulus clouds.
Flight and Encounter
Fifteen minutes after release from the tow airplane, the pilot observed a 'black wall' associated with a cold front approaching rapidly from the west. He immediately began a descent toward the field. During the approach, the glider encountered severe turbulence. To avoid an extreme crosswind landing, the pilot chose to land diagonally across the runway, aligned with the wind.
Incident Sequence
Shortly before touchdown, the glider encountered a sudden and severe downdraft. The force of the downdraft caused the pilot's head to strike and break the plexiglass canopy. Subsequently, the glider's right wing tip made contact with the ground, leading to a 360-degree ground-loop.
Conclusion
The pilot reported the sequence of events as described. No further analysis or causal factors were provided in the source.