Bollettino valanghe

Tetons

Bridger-Teton Avalanche Center
Vedi sulla mappa

Pericolo valanghe

Sat
Alta quota
4 · Forte
Limite del bosco
4 · Forte
Sotto il limite
3 · Marcato
Open full map
Non aggiornato — questo bollettino è scaduto 3 years ago. Stai vedendo condizioni passate, non il bollettino in corso.

In sintesi

A generally weak snowpack is being rapidly loaded by continued snowfall and strong winds. This combination has resulted in dangerous avalanche conditions. Travel in or below avalanche terrain is not recommended today.

 

Problemi valanghivi

  • Persistent Slabs

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

    Since the 4th of January three to four feet of new snow containing nearly 3 inches of moisture has fallen on weak snow surfaces formed during one of the driest Decembers on record. Avalanches involving this interface are expected to occur naturally and will be very sensitive to human triggers today.  Slides can be initiated remotely, meaning from flat terrain that is  above, beside, or below an avalanche starting zone. Avalanches on this layer could be hard or soft and have depths up to three feet. At the higher elevations, once triggered, avalanches could also involve deeper weak snow near the base of the snowpack.  This avalanche problem is widespread at the mid and upper elevations and extends into the lower elevations on certain aspects. 

    (1/11/2024) Natural 2 to 3 foot crown Photo: Dave Miller

  • Wind Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Likely
    Dimensione
    1–1.5

    Snow that started falling yesterday afternoon has been impacted by strong winds and has formed soft slabs on steep leeward slopes. This surface instability will be more obvious at higher elvations where there should be signs of wind loaded snow and will be less apparent at lower elevations where wind loading will be less obvious. These slabs could have depths to 18  inches and once initiated are likely to pull out the underlying snow lying on the weak persistent layers.

Avalanche Discussion

Even though yesterday's weather did not provide additional loading, avalanche activity on the January 4th interface was widespread and extended through all elevation bands. Click here to see that avalanche activity. With additional significant loading from new snow and strong winds, avalanche activity will be even more sensitive and larger today.  Whether or not avalanches step down to the old weak November snow layers is interesting although it should not be the focus as the persistent slab problem involving this week's snowfall creating very sensitive slabs that could injure or kill someone, or  travel long distance and impact parties below. Generally, travel in avalanche terrain is not recommended. Those venturing out into the mountains should stay away from known avalanche paths, and not subject themselves or others to exposure by staying in very low angle terrain.

Regioni coperte