Observed a very large deep slab crown on a N facing slope at approx. 8700 ft in the badin above Elevator Shaft. Seen from orher side of hyalite canyon.
Toured up from Pilot creek Parking lot, dug a pit on an eastern aspect. Had an ECT16 collapse on a layer ~20cm down, but no propagation in our ECTP test. A very weak layer ~25cm from the ground of facets was found in our 125cm deep pit. We did see avalanche debris about halfway up our intended line. Could not tell how recent it was do to heavy winds moving snow around. Do to windy conditions and avalanche activity, we decided to stop our ascent below the avalanche debris and ski back from there.
From obs: "Here are two photos of what I think is a natural slide from this morning (3/1). Looks like a natural slide across from Crown Butte at the top of Daisy Pass. Crown is at least a few feet."
From another rider: "we spoke with a snowmobiler on the trails on Sunday and he mentioned his group initiated that slide Sunday morning."
Forecaster note: The paths immediately to the left and right of this slope avalanched with a snowmobile trigger on 2/13. Photos and video are here: https://www.mtavalanche.com/node/24256
This avalanche likely release naturally Sunday night (2/28). Photo: C. Tuholske
This avalanche was triggered by a snowmobiler on Saturday (2/27). Photo: C. Tuholske
Sled Skiing in Third Yellow mule... after an air onto the slope the impact from landing resulted in a fracture and failure to / near the ground... in addition, a remote trigger occurred on adjacent slope... 200-300 ft to the skiers right. No body was caught in either slide. Skier that initiated failure was moving at high speed and was beyond slide path before majority of snow movement began. Photo: W. Miller
Sled Skiing in Third Yellow mule... after an air onto the slope the impact from landing resulted in a fracture and failure to / near the ground... in addition, a remote trigger occurred on adjacent slope... 200-300 ft to the skiers right. No body was caught in either slide. Skier that initiated failure was moving at high speed and was beyond slide path before majority of snow movement began. Photo: W. Miller
Sled Skiing in Third Yellow mule... after an air onto the slope the impact from landing resulted in a fracture and failure to / near the ground... in addition, a remote trigger occurred on adjacent slope... 200-300 ft to the skiers right. No body was caught in either slide. Photo: W. Miller
This avalanche was triggered on Sunday, 2/28, when a skier released another slide 2-300 feet away. It broke at the same time. No one was caught. This was in the Third Yellow Mule on Buck Ridge. Photo: W. Miller
https://www.instagram.com/p/CL4xIk5n8PZ/
Sled Skiing in Third Yellow mule... after an air onto the slope the impact from landing resulted in a fracture and failure to / near the ground... in addition, a remote trigger occurred on adjacent slope... 200-300 ft to the skiers right. No body was caught in either slide. Skier that initiated failure was moving at high speed and was beyond slide path before majority of snow movement began. 2 pits where dug prior to riding terrain. One on adjacent slope, we went through to ECT 30 and continued to hammer on the column through 40 wacks of double fist, full force before failure occurred 30 cm above ground. Second pit was dug on slope where slide was initiated... same results, very hard to get failure to occur. Snowpack depth varied from 125 - 180 cm in the area... our pits were dug in depths of around 125 cm and 170 cm respectively.
