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Observations

Region: Hatcher Pass
Location: Hatcher Pass/Summit Lake
Observer:
Date:

Route & General Observations

Toured back the Hatcher Pass road to the pass. Between 1pm and 4pm, light snow, temps high 20s, increasing cloud cover. Low snow, however, decent coverage all thing considered.

Avalanche Details

Avalanche details

Trigger SkierAvalanche Type Soft SlabAspect North Northwest
Elevation 3900ftSlope Angle 30degCrown Depth 12in
Width 150ftLength 150ft  

Observer Comments

Avalanche triggered by unknown snowboarder. Soft slab (new snow from December 2nd) which stepped down into older layer, but generally not to ground. Variable crown depth between ~6 inches and ~36 inches, with average depth around a foot. Trigger point looked to be a wind loaded spot, where snowpack transitioned from thing to fairly deep. Did not attempt crown profile, rather we opted to dig a pit nearby.

Red Flags

Obvious signs of instability

Recent Avalanches?YesCollapsing (Whumphing)?YesCracking (Shooting cracks)?Yes

Observer Comments

Recent rider triggered avalanche (reported here), large, propagating collapse, shooting cracks

Weather

Weather

Between 1pm and 4pm, light snow, temps high 20s, increasing cloud cover.

Snow Characteristics

Snow surface

New snow since the day before (December 1, 2018)--slightly wind stiffened

Snowpack

Poor structure found everywhere we looked. The location of our snowpit was the only place we found a generally right-side-up snowpack.

Multiple ski pole probes and hand pits showed a new snow soft slab, overlaying melt/freeze crust, following facets, another melt/freeze crust, and basal facets.

Single snowpit at Hatcher Pass/Summit Lake area: 3800 ft, west aspect, slope ~0, depth of snow 61cm.
CT 1 18cm from surface, new snow interface; CT 18 40cm from surface, melt freeze crust above basal layer of pencil hard snow; ECTP 3 18cm from surface, new snow interface; ECTN 21 40cm from surface, melt freeze crust above basal layer of pencil hard snow.

Photos & Video

Photos



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