Bollettino valanghe

Tetons

Bridger-Teton Avalanche Center
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Pericolo valanghe

Sun
Alta quota
3 · Marcato
Limite del bosco
2 · Moderato
Sotto il limite
1 · Debole
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Non aggiornato — questo bollettino è scaduto 3 years ago. Stai vedendo condizioni passate, non il bollettino in corso.

In sintesi

New surface slabs are forming on hard snow surfaces at the upper elevations. Riders and skiers have the potential to trigger these new instabilities as well as larger avalanches involving older weak snow layers in very steep terrain. Look for and stay clear of areas with obvious signs of wind loading. Also avoid very steep terrain near cliffs or rocky areas above 7500 feet where the persistent slab problem is more likely to be active. 

Problemi valanghivi

  • Persistent Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible
    Dimensione
    1.5–3

    An extended dry period in December formed a layer of weak snow that can be found on all aspects above 7500 feet.  The chance continues for recreationalists to trigger hard slab avalanches with depths of 2 to 4 feet involving this buried layer. Although the likelihood of triggering a slide has decreased,  very steep terrain remains suspect and careful snowpack evaluation is recommended. 

  • Wind Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Likely
    Dimensione
    1–2

    New snow is loading on leeward starting zones.  The underlying surfaces are hard and slick in most areas but can be faceted in colder, shaded terrain. Although small in size this morning, these slabs will increase in both size and sensitivity today as snow continues to fall. By nightfall, soft slab depths could reach to as much as a foot in upper elevation starting zones prone to wind loading. 

Avalanche Discussion

Now that temperatures have cooled, the slabs that lie over the weak layer that was buried a month ago will be much harder to initiate by the presence of a single person.  That being said, the weak layer is well preserved and dangerous hard slab avalanches could still occur if a particular weak or thin spot on a very steep slope is impacted. Tracks offer no indication of stability in this scenario. For those venturing into steeper terrain, taking the time to dig down to the weak layer and evaluating it is recommended on each slope as there is starting to be more variability in the snowpack. Lower elevations are relatively thin and avalanches are unlikely except for isolated areas in very steep north facing terrain. 

Regioni coperte