Bollettino valanghe

Southeast Mountains

Crested Butte Avalanche Center
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Pericolo valanghe

Wed
Alta quota
2 · Moderato
Limite del bosco
2 · Moderato
Sotto il limite
2 · Moderato
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In sintesi

On the northern half of the compass, triggering a hard slab that breaks several feet thick remains possible, evidenced by a couple of recent avalanches (1, 2). The most concerning terrain is near and above treeline, where winds have created thin areas and slabs with variable thickness.  Slopes with a deeper, more uniform snowpack offer a lower chance of triggering an avalanche.   You can avoid the problem on southerly aspects, where today's modest warmup should provide nice spring riding conditions and minor wet loose issues. Wet avalanche concerns increase tomorrow and become more hazardous through the rest of the week (see video).   

Problemi valanghivi

  • Persistent Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible
    Dimensione
    2–2.5

    Old, hard slabs 1.5 to 3+ feet thick overlie buried weak layers and are becoming increasingly difficult to trigger. Without obvious warning signs, avalanches are most likely triggered where the slab is thinner and easier to impact the weak layer below.  You can reduce your risk by avoiding steep terrain with a thin or variable snowpack, such as rocky areas, rollovers, or places where wind has created uneven slab thickness. Southerly aspects and slopes with consistently deep and uniform snow depths offer safer options.

    This avalanche on Mt Whetstone is an example of terrain to avoid, with a thick slab transitioning to thin trigger points around its boundaries. Photo: Kelly Jensen

Avalanche Discussion

Persistent slab issues linger on northerly slopes, typically near and above treeline.  In the Northwest Mountains, triggering a slab that breaks on weak layers several feet deep has become increasingly unlikely.  As you transition from the deeper snowpack to the north and west of Crested Butte into the shallower regions south and east of town,  old slabs are more likely to be triggered.  Slabs are thinner, and weak layers are better developed.  Two recent natural avalanches triggered by wind drifting in the past week provide supporting evidence: one on Mount Whetstone last week and another near Snowmass over the weekend.  Both avalanches occurred in terrain with variable slab thickness due to wind effects.  Steer clear of this type of terrain in both forecast zones to reduce your chances of an avalanche.

A warming trend begins today, with record-setting heat expected later this week. Wet avalanches are expected to become larger and more widespread as the warmup progresses and overnight refreezes worsen.  This video debriefs the situation.  A hard refreeze from the past few days, and temperatures rising into the low 40s, should keep wet avalanches small and limited to a few very steep, rocky slopes today.  The danger starts rising tomorrow, with some uncertainty about how quickly.  We suggest earlier starts and finishes in the coming days, or choosing mellow terrain if you prefer riding in the afternoon slop.   

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