Bollettino valanghe

Southeast Mountains

Crested Butte Avalanche Center
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Pericolo valanghe

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

In sintesi

10 days of quiet weather reduced the chance of you releasing an avalanche. However, the recipe for an avalanche can be found at upper elevations, on slopes that did not naturally release last week, and face northerly or easterly aspects.  You can reduce the chance of an avalanche by selecting lower-angled slopes or avoiding problematic aspects at upper elevations.  Signs of instability are infrequent, so don't count on collapsing or cracking to warn you of the potential danger.

Problemi valanghivi

  • Persistent Slabs

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

    Last week's storm produced a widespread avalanche cycle on November 26-27. Those slabs have now settled to 1 to 3 feet thick over faceted snow that formed earlier this winter. The snowpack is gradually adjusting now: stability tests are improving, and signs of instability have diminished as the problem has become more difficult to trigger. The most problematic slopes face west, north, and east, along with higher-elevation southeast-facing slopes.  Slopes that naturally avalanched last week offer lower-risk options for steep terrain on those aspects.  Move to smaller, less consequential terrain features or low-angle terrain when in doubt.  

    A pair of large avalanches in upper Cement Creek on a northeasterly-facing slope at 12,200ft. These avalanches are estimated to have released last weekend during a period of elevated winds. 

Avalanche Discussion

The danger rating dropped to LOW at all elevations in the Northwest Mountains.  The likelihood of human-triggered slab avalanches reached a level to fit 'generally safe' avalanche conditions.  This is a product of the widespread natural cycle during the Thanksgiving storm removing the problem for a large portion of the steep slopes in the zone.  Snowpack evidence points towards an unreactive snowpack on the remaining intact slopes.  These factors make it very unlikely for a person to trigger a large avalanche.  Exceptions always exist in the world, and if you are considering riding in extreme terrain that is rocky, variable in depth, and high in consequence, be sure to evaluate the snowpack before committing.  LOW danger allows for small avalanches in isolated places and extreme terrain, which certainly applies to our current conditions.

In the Southeast Mountains, the danger rating remains MODERATE at upper elevations.  The natural cycle produced fewer avalanches, particularly in the Brush Creek and Cement Creek drainages, compared to the Northwest Mountains.  More slopes remain intact, with slabs resting above weak basal layers.  The shallower snowpack likely means a slower adjustment toward equilibrium.  With more intact slopes and suspected higher sensitivity, the Southeast Mountains danger rating remains at MODERATE.  We have less snowpack data from the shallower areas, thus creating greater uncertainty about the likelihood of human-triggered avalanches on intact slopes.

Events: The Beacon Brush Up is then behind the Crested Butte Community School on Sunday from 9 a.m.- 2 p.m.  Details are here. 

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