A group of snowmobilers rode to the upper reaches of Eureka Mountain, where one walked to the edge of the ridge and triggered a cornice failure. The person on the ridge fell with the cornice, which triggered a slab avalanche in steep terrain below the ridgecrest, and then entrained loose dry snow on more moderate slopes lower down. The person caught was carried approximately 300 vertical metres/400 linear metres downslope and was buried on the lower slopes approximately 20-115 centimetres below the surface near the right flank of the debris field.
On the day of the incident rescue efforts were hampered by rugged terrain, concerns about overhead hazard, and loss of daylight. A SAR team with support from an avalanche technician carried out a recovery mission the following day.