Bulletin d’avalanche

Togwotee Pass

Bridger-Teton Avalanche Center
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Danger d’avalanche

Sun
Alpin
2 · Modéré
Limite forestière
1 · Faible
Sous la limite
Sans niveau
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Périmé — ce bulletin a expiré 4 years ago. Vous consultez des conditions passées, pas le bulletin en cours.

Points saillants

The combination of recent snow, wind, and buried weak layers make human triggered avalanches possible today. Cracking within wind drifted snow and audible collapsing of the snowpack are signs of instability. Carefully assess the snowpack before entering steep, rocky terrain, especially below large cliff bands.

Problèmes avalancheux

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–2

    Weak snow is buried 1-3 feet deep in the Togwotee area. This snow formed during cold, dry periods in November and early December and is present at all aspects and elevations. Areas with the thinnest snowpack usually harbour the weakest snow. Zones where the wind has formed thicker slabs of snow are of primary concern due to the likelihood of weak snow below. 

    Zones in and around large cliff bands at the upper elevations are of primary concern, especially on unsupported slopes. Aprons below large complexes of cliff bands that were wind loaded from the December 20/21 storm should also be evaluated carefully. 

    Persistent slabs at the middle elevations are unlikely due to the lack of cohesive slabs of snow. Slabs from the most recent snow/wind event at the middle elevations seem to be both isolated and stubborn to trigger. Use caution in and around terrain traps such as creek bottoms. In these zones relatively small slides can pile debris deeper than expected. 

    (12/22/2022)

    Old debris, likely mid storm on the 21st. R1D1

    Photo: Frank Carus

Avalanche Discussion

Togwotee picked up a trace to 1 inch of snow in the last 24 hrs with moderate ridgetop winds out of the WSW. More light snow and moderate wind is on tap for today, but accumulations should be light.

The Togwotee area did not pick up as much snow as the other forecast areas during the last storm (December 20/21). With low temperatures dipping down into the -20 Fahrenheit range it is doubtful that this new snow will be very reactive. What is certain is that the overall structure of the snowpack is very weak in the Togwotee area, with thin areas composed mostly of facets and crusts. Wherever the raging winds DID deposit the new snow into slabs there is sure to be a weak layer below. Steep south and east facing slopes above creek bottoms are examples of zones where riders could potentially get into trouble. At the upper elevations mid slope areas and aprons below cliff bands are of primary concern. With the extreme winds most of the new snow that did fall over December 20/21 ended up well below the traditional starting zones near ridgeline.

Régions couvertes