Gunnison
AvalancheBen Pritchett · Mar 1, 2022 · Gunnison
Weather
Very warm day, full sun, no wind.
Snowpack
We found 1-finger hard slabs resting on Fist-hard facets. The slabs were soft on top, stiffer at the bottom, with an obvious dirt stripe above the faceted weak layer.
At a northwest-facing crown profile above a snowbike-triggered avalanche from Sunday, we found a reactive, dry snowpack. ECTP 14 on the dry-spell weak layer.
Traveling through sunny, southerly-facing terrain on Mt. Emmons, we experienced many dozen collapses with long running (100's of feet) cracks. Meltwater reached the dry-spell facets and created unstable conditions.
A profile on the flank of a large skier-triggered avalanche in Red Lady Bowl showed the meltwater reached the weak layer yesterday. Water wicked through the low-porosity facets. Today, meltwater reached another 10 to 12 inches below the facets into the upper part of the Holiday Slab.
At a northwest-facing crown profile above a snowbike-triggered avalanche from Sunday, we found a reactive, dry snowpack. ECTP 14 on the dry-spell weak layer.
Traveling through sunny, southerly-facing terrain on Mt. Emmons, we experienced many dozen collapses with long running (100's of feet) cracks. Meltwater reached the dry-spell facets and created unstable conditions.
A profile on the flank of a large skier-triggered avalanche in Red Lady Bowl showed the meltwater reached the weak layer yesterday. Water wicked through the low-porosity facets. Today, meltwater reached another 10 to 12 inches below the facets into the upper part of the Holiday Slab.
Avalanche
The avalanche near Kebler Pass released on Sunday afternoon, triggered by a snowbiker. It appeared the snowbiker was mixed up in the moving debris and exited the bottom of the slope. This was a dry soft-slab avalanche that broke around two feet deep, on facets below the dust stripe.
The avalanche in Red Lady Bowl was a Wet Slab avalanche that released between 10 and 30 minutes after a single skier skied the slope. The avalanche released in the exact same terrain that was skied prior, erasing around 600' vertical of the skiers tracks. This avalanche broke on a layer of fist-hard wet facets. The meltwater that wetted the facets was generated at the snow surface on Sunday, February 28th. On March 1st, the facets remained wet, but the meltwater percolated another 10 or 12 inches below the avalanche's weak layer.
The avalanche in Red Lady Bowl was a Wet Slab avalanche that released between 10 and 30 minutes after a single skier skied the slope. The avalanche released in the exact same terrain that was skied prior, erasing around 600' vertical of the skiers tracks. This avalanche broke on a layer of fist-hard wet facets. The meltwater that wetted the facets was generated at the snow surface on Sunday, February 28th. On March 1st, the facets remained wet, but the meltwater percolated another 10 or 12 inches below the avalanche's weak layer.