Big John Bowl

Carte pour le rapport du Réseau d'information en montagne: Big John Bowl

Information

Date/heure de l'avalanche
samedi 24 novembre 2018 à 12 h 17
Nombre d'avalanches dans ce rapport
1
Taille de l’avalanche
3
Caractère de l'avalanche
  • Neige sèche sans cohésion
  • Plaque persistante
  • Plaque à vent
Type d'élément déclencheur
Motoneige
Sous-type d'élément déclencheur
Accidentel
Versant de la zone de départ
  • NO
Bande d'altitude de la zone de départ
  • Alpin
Date d'ensevelissement de la couche fragile
mardi 20 novembre 2018
Type de cristaux de la couche fragile
  • Givre de surface et grains à faces planes
Exposition au vent
Pente sous le vent
Couverture forestière
Pente dégagée

Commentaires

I want to give a huge high five to his two friends that were first on scene that located him and got him half unburied. If it wasn't for them we would have lost a soul in the mountains today. We were approached by a rather frantic dude stating that "he just got buried". We rushed over and dropped into Bog John to find 2 guys digging up a man and multiple fully buried sleds. I hung out and helped with the buried man seeing he was only half out when I arrived. It was hard to get a solid answer out of the crew if they knew if anyone else was buried, so we kept searching, with mixed signals (people kept arriving with their transceivers in send). After a couple of minutes we realized that the coast was clear and quickly left the area and the remainder of the crew dug their snowmobiles out. Not 100% sure what the story was but what I understood from the multiple people talking was that there was multiple people on the slope at once sidehiling, which is what triggered the propagation of a crack then slab to slide. It was a north facing wind loaded slope that was about 45 degrees and ripped right to the ground. My guess of what caused the slide was the faceted snow at the ground (big fluctuation in temperature in a short period of time). Very happy everyone walked away uninjured and alive.