Avalanche: Hatcher Pass

Location: Marmot Mountain

Date:
Observer:
Route & General Observations

Toured up the standard Marmot up track from the Fishhook Lot. Descended SW face and the Mid-rib. Primary focus of tour was to assess stability from the 11/7-8 storm which resulted in naturals, remotely triggered, and human triggered avalanches until 11/10. Stability has improved although the snowpack structure is still poor.

Avalanche Details
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Trigger SkierAvalanche Type Dry Loose Snow
Aspect SouthElevation 4200ft
Slope AngleunknownCrown Depthunknown
WidthunknownVertical Run 800ft
Avalanche Details

Observed a skier trigger a D1-1.5 dry loose on a steep southerly slope. No one was caught or carried.

Red Flags
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Observer Comments

No cracking, collapsing, or whumping observed today. Two small, recent dry-loose avalanches were human triggered today with no incident. No new slab avalanches were observed today.

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

Clear skies with fog in the valley.
No new snow since 11-7/8.
Calm to light winds today from the east. Some pluming observed off high peaks on Arkose Ridge.
18 deg. at 4500' for most of the day.

Snow surface

Variable snow surfaces exist depending on aspect and elevation. New settled snow from 11/7-8 still exists in mostly leeward, wind protected locations with a snowpack consisting of about 30" of snow. Expect to see a shallower snowpack on windward or southerly aspects where wind stripped slopes have about 12" of snow. Old melt-freeze crusts (of varying hardness) are sitting over a very weak pile of facets. Rocks and shrubs are still very visible in specific locations.

Snowpack

Moderate hand shears were performed near the Marmot uptrack, SW 3000'. The melt freeze crust was detectable from 2500 to 3800'. The MF crust was visible on the surface overlying facets on windward aspects while buried up to 24" deep on leeward aspects.

Pit 1, SW 3000'
HS 60cm
Slope angle 26 deg
F 60-50cm-Stellars, DF, rounds
4F 50-27cm-Rounded facets
P 27-24cm-Melt-freeze crust
F 24 - 0 (ground) -Facets

Pit 2. WNW, 4100'
HS 75cm
Slope angle 30 deg.
F 75-55cm
4F 55-50
P 25-23 -deteriorating melt freeze crust
F 23- 0(ground), moist facets, some depth hoar
Tests: ECTX x2
CTN, CT15 Q2 @35cm
PST 60/100 Arr (below the crust)

Photos & Video
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