Avalanche forecast

Southeast Mountains

Crested Butte Avalanche Center
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Avalanche danger

Thu
Alpine
3 · Considerable
Treeline
2 · Moderate
Below
2 · Moderate
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Highlights

You can encounter dangerous avalanche conditions on well-drifted slopes at upper elevations.  Leeward terrain on the eastern half of the compass is the most likely place to find a sensitive slab of wind-drifted snow.  Avoid terrain with signs of drifting like areas underneath cornices and below ridge tops.  There is a lingering threat of avalanches breaking deep in the snowpack on drifted terrain.  You can reduce your chances of triggering a dangerous avalanche by seeking out sheltered slopes at lower elevations.

Avalanche problems

  • Persistent Slabs

    • Alpine
    • Treeline
    • Below treeline
    Likelihood
    Possible
    Size
    2–3.5

    Large, stubborn slabs several feet thick or more exist over faceted weak layers in the upper snowpack.  Remote triggers and natural avalanches failing on these persistent weak layers have been gradually diminishing since widespread activity last week. The most recent persistent slabs have required larger triggers such as the mass of a smaller avalanche running through the terrain or a cornice falling. The greatest number of avalanches have occurred on easterly-facing slopes where faceted crusts exist. Similar structures exist on west-facing terrain, and shallow slopes on the northern half of the compass have also been problematic.  Recent warming on lower elevation and more southerly aspects has strengthened the upper snowpack with crusts, and triggering persistent slabs is less likely in that terrain. 

    Early warning signs for this avalanche problem are rare and feedback is infrequent. You can reduce your chance of triggering this avalanche problem by avoiding recently wind-loaded terrain and unusually shallow terrain.  Safer riding is where the snowpack is deep, wind-protected, and on slope angles less than 35 degrees, without steeper slopes above. 

    Very large persistent slab on the east face of Gothic Mountain. 3/31. This avalanche was likely triggered by a cornice falling onto the slope. 

  • Wind Slabs

    • Alpine
    • Treeline
    • Below treeline
    Likelihood
    Likely
    Size
    1–1.5

    Snowfall began early Tuesday morning and continues throughout Tuesday.  The most likely place to trigger an avalanche in the storm snow is on leeward slopes loaded by southwest and west winds.  As storm totals near a foot, avalanche problems in the storm snow may begin to develop on steep wind-sheltered slopes.  Avoid leeward terrain to reduce your chances of triggering an avalanche in the storm snow and use increased caution in sheltered areas if storm totals exceed 10 inches.

    4/1: A wind slab triggered by a cornice fall.

Avalanche Discussion

Storm totals of up to 8 inches exist with the potential for a couple to accumulate on Wednesday.  The deepest totals can be found in the Northwest Mountains with lesser amounts near town and to the east.  Westerly winds efficiently drifted snow at upper elevations on Tuesday but slowly diminished overnight.  The avalanche hazard posed by freshly drifted snow increases as you move toward higher elevations.  There will be more slopes above treeline with sensitive slabs than near treeline as there is more open terrain for the wind to gather snow from and deposit on leeward terrain features.  The difference in the rating between near and above treeline slopes is a product of distribution; the more drifted slopes that exist make it more likely for you to find one.  Simply avoid drifted slopes above treeline and use caution and thoughtful terrain and snowpack assessment near treeline to ensure you do not cross a well-drifted slope.  Drifted slabs are generally isolated below treeline.

There is a lingering chance of triggering an avalanche that breaks much deeper than the storm snow.  This potential is most likely on wind-drifted slopes at upper elevations, more common in the Southeast Mountains, and shallow/rocky terrain.  Several different faceted crusts exist in the snowpack in addition to well-developed Depth Hoar near the ground on northerly slopes with a shallow snowpack (less than 150cm or 5 feet).  The last two storm systems produced several deep and widely-propagating avalanches on well-drifted slopes at upper elevations.  Cornice fall was often the culprit for releasing these deep avalanches.  The current wind-loading period will increase the chance of cornices falling and releasing very large avalanches.  

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