Avalanche: Hatcher Pass

Location: Marmot Mid-rib

Route & General Observations

Toured from Goldmint up to IM and Marmot to look at upper elevation stability and figure out what the culprit weak layer was for the recent avalanches on Saturday. We found buried surface hoar sitting on top of a melt layer recrystallization (MLR) crust that formed somewhere around Feb 24th. Riding conditions were excellent. Southerly aspects has approx 4″ of moist snow by afternoon and many small wet loose were observed. Recent cold overnight temps have improved riding and are the reason for D1-D1.5 dry loose sluffs which were observed on steep slopes above 40deg in the morning.

Avalanche Details
If this is an avalanche observation, click yes below and fill in the form as best as you can. If people were involved, please provide details.
Trigger NaturalRemote Trigger Unknown
Avalanche Type Wet Loose SnowAspect South
Elevation 3500ftSlope Angleunknown
Crown DepthunknownWidthunknown
Vertical Rununknown  
Avalanche Details

Numerous D1 wet loose sluffs observed the afternoon on steep southerly aspects below 3500'.
Few D1-D1.5 dry loose sluffs observed on all aspects in the morning while temps were still cool below 5000'.
No new slab avalanches observed today.

Red Flags
Red flags are simple visual clues that are a sign of potential avalanche danger. Please record any sign of red flags below.
Obvious signs of instability
Recent Avalanches?Yes
Collapsing (Whumphing)?No
Cracking (Shooting cracks)?No
Observer Comments

Wet loose and dry loose sluffs were observed today. For the most part, these are surface instabilities and manageable hazards.

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

no new snow since 3/9
calm winds today
4500'/Marmot reported 25 deg at 4500 feet today felt like 40 deg
3550'/IM reported a high of 25 deg at 1pm
4050'/Gold Chord reported 32 deg at 1pm

Snow surface

The snow surface consists of mostly rounds , some NSF, and a variety of thicknesses of crusts up to 4" thick on mostly southerly aspects.


4200' NW aspect
38 deg slope
HS 260cm
217 Buried surface hoar 2-4 mm in size, mostly laying down, decomposing
217-215 Melt layer recrystallization crust
rounds below that until deep weak layers but goal was to focus on surface instabilities.

Photos & Video
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