Bollettino valanghe

Southeast Mountains

Crested Butte Avalanche Center
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Pericolo valanghe

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

In sintesi

Smaller storm totals in the Southeast Mountains mean that instabilities in the new snow are typically thinner and confined to leeward slopes.  Use caution as you gain elevation into wind-affected terrain.  On leeward slopes, you can trigger shallow drifts in the fresh snow.  On high, northerly aspects, there's a smaller chance you can trigger a much larger slab in steep terrain where snow depths are thin and variable.   The safest riding is wind-protected terrain.  

Problemi valanghivi

  • Wind Slabs

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

    The new and windblown snow has formed fresh slabs on leeward terrain features favored by westerly winds.  These slabs formed over various surfaces; some could remain sensitive to triggers today.   Carefully assess slab size and terrain consequences before riding in steep, leeward terrain.  Fresh wind slabs are commonly found below corniced ridgelines, abrupt rollovers, or in crossloaded gullies.  Cracking, collapsing, and thick/stiff drifts indicate the problem.  You can avoid the problem on wind-eroded or wind-sheltered terrain.    

    A small natural wind slab that ran on Monday in the Anthracites.  Expect slabs to be thicker at higher elevations.  Photo: Miles Morris

  • Persistent Slabs

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

    The snowpack remains winter-like on high, northerly aspects, and faceted weak layers linger near the bottom of the snowpack.   Persistent and deep persistent slabs are most likely triggered by cornice falls, or there's a slight chance you can trigger one from a shallow or rocky part of a steep slope.   Terrain where the snowpack is unusually shallow from wind effects or previous avalanche activity is most concerning.  You can reduce your risk by traveling where the snowpack is deep and uniform, and you can avoid the problem on sunnier aspects that have a spring-like snowpack that saw extensive meltwater last week.  

    A large persistent slab on Gothic triggered by a shallower wet avalanche on 3/25.

Avalanche Discussion

Storm totals range from 20" (~1.5" SWE) at Irwin to less than 6" in the Southeast Mountains.  Today's danger ratings highlight where instabilities in the new snow will be larger and more common.  On most terrain, you will just have to manage the new snow over firm crusts that formed during last week's meltdown.  In some cases, thin facet layers formed above these crusts and new slabs could remain sensitive today, while other slopes are likely bonding well already.   This layer is probably the source of reports of "super touchy wind slabs" and a remote triggered wind slab over the past two days near Marble.   The facet layer likely formed from melt-layer recrystallization before the storm, and we have limited data on its distribution right now.  Gather feedback on how the storm snow is behaving and use extra caution on drifted features where slabs will be thicker and stiffer.  

The only slopes that didn't see extensive meltwater into the snowpack last week are high, northerlies. A more winter-like snowpack structure exists and requires consideration for the early-season weak layers that have plagued us this winter, especially on terrain with unusually shallow snow depths. The most recent examples of the problem include a snowmobile-triggered slide on Axtell and a skier-triggered slide on Gothic. 

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