Avalanche

Kebler Pass and pavement observations in afternoon

Eric MurrowGunnison
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Observation photo 1

Quick report

Loose avalanches seemed to be the most likely problem to encounter.  On shady features, there is up to a foot (generally less) of entrainment on steep slopes. On sunny slopes, strong solar radiation battled with cool air temperatures, and the sun prevailed.  Sunny terrain produced some natural avalanche activity from daytime heating, but human triggered slides seemed probable on slopes around 40 degrees or steeper.  

I didn't target wind drifts on shady aspects where the new snow accumulated on facets above a crust, so I remain wary of drifting on northerly terrain.

Weather

Wind Loading
previous
Recent Snowfall
20
Snow Avail For Transport
moderate amounts

Mostly clear skies. Storm totals varied from 5 inches near Kebler TH to almost a foot on Ruby Peak. Sheltered northerly terrain on AMR held 9 inches.

Snowpack

While touring through southerly terrain near treeline, I didn't experience cracking while ascending through drifted terrain features with soft textures up to two feet deep.  Hasty hand shear pits revealed marginal bonding between the new snow and old crusts.  This interface was slightly faceted.  I speculate that this was a product of a moist, not fully frozen crust when the recent snow began to accumulate.  The recent storm snow became moist before noon and created a loose avalanche problem on steep terrain features.

On northerly terrain in the Anthracite Range, the new snow remained soft without cohesion.  Small, Dry Loose avalanches were probable on features around 40 degrees.  The storm snow accumulated on a thin layer of facets above last week's friable rain crust.  Not enough snow accumulated to create a slab avalanche problem in sheltered areas. 

Avalanche

Size
D1.5
Type
SS
Count
10
Aspect
N
Trigger
N
Elevation
11800 ft

Early in the morning, numerous small Dry Loose avalanches were observed on most aspects at upper elevations. By midday, a few natural loose avalanches began to run on steep rocky terrain features in the sun. On Mount Axtell a few natural slabs were visible in the morning; these avalanches had minimal propagation but were not point releases.