Bollettino valanghe

Togwotee Pass

Bridger-Teton Avalanche Center
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Pericolo valanghe

Fri
Alta quota
3 · Marcato
Limite del bosco
3 · Marcato
Sotto il limite
Senza grado
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In sintesi

Warm temperatures and sunshine may push avalanche danger to Considerable today.  Large avalanches may occur without a human trigger as temperatures continue to rise. Very large avalanches on weak snow buried deeply in the snowpack are also possible in some areas. You'll find better riding and lower avalanche risk where surface snow is not wet. 

Problemi valanghivi

  • Wet Slabs

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

    Wet snow avalanches may become likely in Togwotee today. The threat of  human-triggered wet avalanches will increase as temperatures warm, particularly if cloud cover fails to develop. Steep, sunny and rocky areas are where these 1-2 foot thick avalanches are most likely to occur. Yesterday, cloud cover and a breeze kept the snowpack cool enough to limit instabilities in the snowpack. Today, temperatures and sky cover are key factors for stability once again.  Due to last night's warm temperatures, the melting required to trigger wet slabs may happen quickly during periods of sunshine, especially in more wind-sheltered locations. Lingering under steep, sunny or rocky areas wouldn't be a good idea due to the possibility of a larger avalanche releasing naturally due to heat and flowing water. Also, be mindful of cornice failures today. They may break easier today and could fail on sunny aspects in the heat of the day.

     

     

  • Persistent Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible
    Dimensione
    1.5–2.5

    Triggering a persistent slab avalanche is possible on weak snow buried 2-4 feet deep. The weak, sugary snow exists across all elevations and aspects except middle-elevation southerlies. The most probable areas to trigger a persistent slab avalanche include steep, rocky, and wind-affected slopes on the north half of the compass. These areas contain thin, shallow spots where riders can more easily impact weak layers. Shallower snow is also found east of the continental divide and south towards the Gros Ventre Range. Previous tracks on a slope are not an indicator of stability. Use caution in steep terrain and give yourself a wide margin of error on slopes with high consequences or near terrain traps. Move to low-angle terrain to avoid this problem. 

    The last known persistent slab avalanche occurred on 3/16 in Upper Deception Creek. On 3/19, a wet slab avalanche failing on these persistent weak layers occurred on Breccia. More avalanches such as these will likely occur today, and many problems may span the border between a wet slab and a persistent slab problem. However, both will be equally destructive avalanche types.

    (3/28/2024)

    Total snowpack from Jules Bowls. 10,000' on a NE aspect. 125cm total height. The weak snow at the base is clearly visible.

    Photo: Cameron Galt

Avalanche Discussion

Temperatures overnight were warm with a very light freeze of the snowpack at best. Temperatures at some weather stations even rose this morning with the southwest flow. Radar shows cloud cover streaming into the region but it's possible these clouds will remain to the west of Togwottee. You'll want to keep a close eye on temperatures, cloud cover and wind today.

Help us improve avalanche forecasts! CLICK HERE to take an avalanche forecast survey and be entered into a prize drawing. The Colorado Avalanche Information Center, the Avalanche Research Program at Simon Fraser University, and the U.S. National Science Foundation National Center for Atmospheric Research are researching how skiers, snowmobilers, snowshoers, ice climbers, and anyone else who travels in the backcountry interpret avalanche forecast information. Part of this research includes a specific survey to better understand how useful avalanche forecast information is for trip planning. 

Completing this survey will take approximately 20 minutes. Thank you for sharing your feedback to help us improve avalanche hazard communication. 

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