Avalanche: Summit

Location: Fresno Peak Tour--Southeast Ridge

Route & General Observations

Pro 2 Observation Tour. Goal was to investigate wind slab and persistent slab; including the Halloween Crust and New Year’s Crust layers.

Avalanche Details
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Trigger SkierRemote Trigger No
Avalanche Type Hard SlabAspect East Southeast
Elevation 3400ftSlope Angle 42deg
Crown Depth 24inWidth 400ft
Vertical Run 500ft  
Near Miss / Accident Details
Avalanche Details

Skier skied out on to the slope and felt slope collapse while making the first turn. Skier looked up and saw slab fracture. Skier was able to the ride off the slab while it was still intact without incident. No one caught or carried. Up track was not buried in avalanche.


Debris measured 105-205cm deep.

Events of the day

See pit data later in OBS

Rescue events


Red Flags
Red flags are simple visual clues that are a sign of potential avalanche danger. Please record any sign of red flags below.
Observer Comments

There was no other bullseye data noted during this tour. There were no other shooting cracks, collapses, or natural avalanches noted. Active wind loading from W to E during the time of the incident.

Weather & Snow Characteristics
Please provide details to help us determine the weather and snowpack during the time this observation took place.

Temps ranged from -6C to -10C throughout our tour and there was about 3cm of new snow.

Wind shifted from S to W around 1030. West wind became significantly stronger around 1200.

Snow surface

Surface snow below tree line showed little to no wind effect and provided good skiing. As we travelled higher into tree line and above tree line terrain surface snow became more variable. There were areas of soft snow, areas of old wind slab, and areas where it was scoured down to the New Year's Crust.


We had propagating results in snow pits where the wind slab existed. On a ESE slope at 3000 feet we had a ECTP22 above the Halloween Crust near the bottom of the snowpack. The weak layer the avalanche failed on were cupped depth hoar 2-4mm in size.

Average HS in this area was around 130cm. The New Year's Crust was about 35cm down and the Halloween Crust was about 95cm down.

See photos for additional snowpit data.

Photos & Video
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