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Яндекс.Метрика
2025-02-04

Group of 7 Caught and Carried in Avalanche Outside Jackson Hole Mountain Resort, WY, Boundary




Yesterday, a group of seven triggered a large hard slab avalanche south of the boundary of Jackson Hole Mountain Resort, Wyoming. All members of the party were caught and carried.



Related: Snowmobiler Killed by Avalanche in Utah’s Monte Cristo Snowmobile Area



The large skier-triggered avalanche occurred on a northeast-facing slope at 9,400′. It likely failed on the new/old interface buried on January 31.

“In the upper elevations, very dense new snow (up to 20%!) and consistently strong winds have created a hard slab about 2-3 feet thick that is sitting on the old snow interface that was buried on 1/31. Good visibility revealed relatively little natural avalanche activity in the area. We noticed one large crown (3+ feet) above Central Couloir and several other smaller crowns (~1ft) on steep features. It’s likely that many avalanches have already been filled in by the wind. It should be noted that many large avalanches were triggered this morning with explosives by the Jackson Hole Ski Patrol.

Ski penetration was only about 2-4” deep, which would explain why human triggering appeared to be stubborn throughout much of the day. However, the large skier triggered avalanche that occurred in Rock Springs North Bowl late this afternoon shows that triggering an avalanche is still possible despite the usual “punchy” or “upside down” warning signs associated with storm/wind instabilities not being obvious.

The snowpack is saturated and mostly cohesionless below 7,500’ from the rain and above freezing temperatures. I noticed 7 or 8 natural avalanches on the Wilson Faces. Several of the debris piles were large enough to bury a person.”

– Bridger-Teton Avalanche Center (BTAC) observation summary

Fortunately, all members survived and walked away with only minor injuries.

Three-day storm totals were 29 inches of snow containing 4.25 inches of water, including 9″ of snow the day of the incident. The weight added to the snowpack is significant despite the modest snow totals, reports the BTAC.



The avalanche rating at the time of the accident was 4 (HIGH) and an avalanche warning was in place.

“Heavy snow and strong wind have created very dangerous avalanche conditions in the mountains. Slabs ranging from 1 to 3 feet in depth will be reactive to the weight of a skier or snowmobile. Natural avalanches are possible in wind loaded mid/upper elevation terrain and low elevation terrain where the snowpack is saturated from rain. Traveling in, near, or under avalanche terrain is not recommended today.

The NWS has issued a Winter Storm Warning that is in effect until Monday 11am.”

– Avalanche forecast for Monday, February 3

Given this avalanche’s size and destructive force, this incident could have had a much worse outcome. The potential remains for similar events today. Dangerous avalanche conditions exist today, Tuesday, February 4. Today’s rating is 3 (considerable), and very large avalanches in steep terrain will be possible. Warm temperatures are helping to increase the likelihood of triggering. Stick to terrain 30 degrees or less and avoid being in the runout of terrain from above.





The post Group of 7 Caught and Carried in Avalanche Outside Jackson Hole Mountain Resort, WY, Boundary appeared first on SnowBrains.

Ссылка на источник: https://snowbrains.com/group-of-7-caught-and-carried-in-avalanche-outside-jackson-hole-mountain-resort-wy-boundary/


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