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Two skiers traversing along the ridge had a cornice break which triggered this slide north of Baldy Peak in the Bridger Range. Photo: N. Truax
 

This avalanche was triggered by a snowmobiler on Friday (1/22) on a north facing hill in the 3rd Yellowmule. Crown was 2-4' deep and down to depth hoar on the ground. Photo: M. Firth

A snowmobiler triggered this small avalanche in Cabin Creek on Thursday (1/21). Photo:B. Radecky

On Tuesday, January 19^th, two on-duty Yellowstone Club (YC) Ski Patrollers were helping two MSU graduate students collect data for snow science research. They were on private land in an uncontrolled backcountry setting, when, skiing back in-bounds to the YC, one of the patrollers triggered an avalanche.He jumped off a cornice onto a steep (39-42 degrees) wind-loaded slope which avalanched on his second turn. The slide broke 2-4 feet deep, 300 feet wide and carried him through a terrain trap of thick trees. He was partially buried at the toe of the debris 300 vertical feet below.

This is the spot where the skier jumped onto the slope. Two turn later he triggered the avalanche. Photo: GNFAC