Bollettino valanghe

Northwest Mountains

Crested Butte Avalanche Center
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Pericolo valanghe

Tue
Alta quota
2 · Moderato
Limite del bosco
2 · Moderato
Sotto il limite
1 · Debole
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Non aggiornato — questo bollettino è scaduto 3 years ago. Stai vedendo condizioni passate, non il bollettino in corso.

In sintesi

Yesterday's new snow has also drifted into small pockets of wind slab at higher elevations.   Use caution in leeward terrain, especially above cliffs, trees, and gullies.  Although we don't have good evidence of large avalanche problems persisting in the stronger snowpack of the Northwest Mountains, there has been a rash of accidents around the state in the past two days, and an extra dose of caution is recommended right now.     

Problemi valanghivi

  • Wind Slabs

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

    3" to 5" of snow since yesterday has been drifting into thin slabs at higher elevations from west to southwest winds.  Fresh wind slab formation will be most common below cornices and in crossloaded gullies, and will be small in size.  There is a lingering threat to still trigger a larger and older wind slab that formed last week in the same type of terrain.  Use caution in wind loaded terrain features, especially above terrain traps.  

    An example of shallow wind slabs, similar to what you can find today.  

Avalanche Discussion

Colorado saw a rash of avalanche accidents over the weekend, along with tragic outcomes in the San Juan Mountains, where last week's storm was most intense.  Two skiers were killed in an avalanche near Vallecito Reservoir, and a snowmobiler is still missing after an avalanche near La Manga Pass.  Locally, a skier was partially buried on a small slope on Saturday, and another skier was carried in an avalanche yesterday near Snowmass.  Last week's storm brought significant snowfall, relentless windloading, and dangerous conditions.  The danger is now trending down as storm and wind slab instabilities from last week are assessed to be generally unreactive or very isolated.  The threat of triggering a large avalanche remains most concerning in the Southeast Mountains, where several buried persistent weak layers have continued to sporadically produce signs of instability or avalanche activity this month.  Although we do not have evidence of the problem misbehaving in the deeper and stronger snowpack of the Northwest Mountains, our forecast team is still looking for it and discussing the uncertainty.  The layer of concern is a layer of facets or faceted crusts a few feet deep, which has produced collapses and avalanche activity up to the boundary of our two forecast zones, on Mount Emmons (Example A, Example B).    In the shallower parts of our forecast area, there is also the isolated threat of avalanches breaking on weak layers near the ground, exemplified by this unstable test result yesterday near Mt. Whetstone.  

Up to 5" of new snow and moderate west to southwest winds are forming shallow wind slabs at higher elevations.  Tonight's potent system will bring stronger winds and significantly more snow available for transport.  Wind slabs will grow larger and more widespread overnight, and the avalanche danger will rise accordingly.  

Events: The next Fireside Chat event is tonight at the new “billy barr” in the Elevation Hotel lobby, 7:00pm. Local guide Dave Bumgarner will be sharing pictures and stories from his recent trip to Antarctica. Enjoy drinks and food, and check out this new local spot.

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