- Soumis par
- Matt Coté
- Date d'observation
- dimanche 4 décembre 2022 à 22 h 00
- Localisation
- 50.950470° N 118.070150° W
- Rapport concernant
- Conditions de neige
/-118.07015,50.95047,8,0,0/1026x200?access_token=pk.eyJ1IjoiYXZhbGFuY2hlY2FuYWRhIiwiYSI6ImNqd2dvZmUxdzE4ZWg0M2tkaXpuNG95aTQifQ.pBLM87fE3sIxRJqJT7Bf7g)
Express
Avalanche
Manteau neigeux
Météo
Incident
Information
- Date/heure de l'avalanche
- dimanche 4 décembre 2022 à 22 h 00
- Estimation de l'heure d’occurrence de l’avalanche
- > 12 à 24 heures
- Nombre d'avalanches dans ce rapport
- 1
- Taille de l’avalanche
- 2
- Épaisseur de la plaque
- 70cm
- Largeur de la plaque
- 70m
- Longueur d'écoulement de l'avalanche
- 200m
- Caractère de l'avalanche
- Plaque à vent
- Type d'élément déclencheur
- Skieur
- Sous-type d'élément déclencheur
- Intentionnel
- Versant de la zone de départ
- SO
- Bande d'altitude de la zone de départ
- Alpin
- Altitude de la zone de départ
- 2 250m
- Inclinaison de la zone de départ
- 40°
- Altitude de la zone de dépôt
- 2 100m
- Date d'ensevelissement de la couche fragile
- dimanche 20 novembre 2022
- Type de cristaux de la couche fragile
- Givre de surface et grains à faces planes
- Croûte près d'une couche fragile
- Non
- Exposition au vent
- Pente chargée latéralement
- Couverture forestière
- Pente dégagée
Commentaires
Ski cut a decent avalanche in Montana Bowl around 2pm. I got some loose, wet snow running down from the trees when approaching the col. From the col I could see the gut of the run had almost no snow in it, ground was still showing in several places. It had either been stripped in previous wind events or had cycled naturally already sometime in the past, but I strongly suspect it was wind. The options were either hike back out or do some more cutting and see if I could rinse more snow through the gut to clean it out and ski down. I cut a little more and it popped on the thin-to-thick interface where the wind slab ramped up under the rocks at ridge top. Pretty classic trigger point, but it happened right at the end of the cut when I was moving pretty slow, and broke about a metre above me, so I still had to ski off some moving chunks. Wasn't the greatest ski cut of all time. Crown top was about 15 to 20 metres wide but propagated quite a bit wider lower down in the bowl, to around 70 metres, just judging by eye. Because it went more or less to ground in the middle of it I'm not totally sure what layer-date reacted. The gut cracked 10 to 15 cms deep (since that's all the snow that was in there), but along the flanks where the windslab was deeper the crown was about 70 cms. Ran more or less full path, it stopped just a little short of the bottom of the bowl. I skied the bed surface after and checked out the edges. Another post is calling it a size 3, I personally think that's an overestimation, but either way it's still not something you would have wanted to be in. It was a marginal ski cut, and the right decision would have been to hike back up and out, or to have not been there in the first place, which was also pretty obvious. It's spicy in the alpine and still early season, don't be me.