Avalanche: Hatcher Pass

Location: Marmot

Date:
Observer:
Route & General Observations

Skinned up south side of marmot. skied skin track then skinned up same route to marmot summit an skied first SE ridgeline just beyond the weather station down to the road. Dug a quick pit on marmot uptrack, about 3700′ SSW aspect, 30-32 degree slope. Our results showed failure for CT(13) Q2 at same layer mentioned in Joe’s post. From that layer up the snowpack was indeed upside-down.
As mentioned in the HP avy forecast, we found mid-elevations to be most reactive. When skiing down the ridge to the road, we triggered a wet, loose, slow-moving slide that split into 2 separate slides due to 2 fall-lines. It was triggered on a steeper small rollover, probably 35 degrees but definitely no more. The slide grew in size as it plowed more snow.

Avalanche Details
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Trigger SkierAvalanche Type Wet Loose Snow
Aspect South SoutheastElevation 2900ft
Slope Angle 35degCrown Depthunknown
WidthunknownVertical Rununknown
Red Flags
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Obvious signs of instability
Recent Avalanches?Yes
Collapsing (Whumphing)?Yes
Cracking (Shooting cracks)?No
Observer Comments

We did hear whumphing/settling around the 2500'-3000' level on low-angle areas on the ridge where the loose wet slide was, no other areas though.
A few recent wet-loose slides were noticed on Marmot's W face, mid-storm and post-storm.

Weather & Snow Characteristics
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Weather

New snow as mentioned in HP avy forecast. overcast skies with an occasional brief sucker hole. warm at lower elevations but cool enough that it was dry-ish near marmot summit. mild winds.