Avalanche: Juneau Mainland

Location: Chop Gully

Route & General Observations

Looked up coming out of Mt Roberts trailhead and saw an impressive powder cloud with loose snow pouring off the falls. Most snow stayed airborne with high winds ongoing (sustained 13 m/s = 30 mph winds at nearby tram station). Very little debris left behind at the bottom of the path. Powder cloud hit the flume, basin road, and drifted over Mt Maria (Dzánti).
I talked to a girl who had been walking the Flume when it came down right behind her where she had just walked. She had only seen one other person going the opposite way before walking through the run out of the path. Also of note this same path had another small slide in it earlier this morning, as witnessed by Johnny B.

Avalanche Details
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Trigger NaturalAvalanche Type Soft Slab
Aspect SouthElevation 2600ft
Slope AngleunknownCrown Depthunknown
Width 300ftVertical Run 2500ft
Avalanche Details

Wind slab release of SS-NS-R2-D1.5 avalanche. Crown line information assessed from photo by Mike Janes ~30min after the slide. Timelapses of the slide also viewable (for today only!) on https://webcams.thesnowcloud.com/

Here's the links to three videos I got since I can only post one on here:


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

Strong wind loading.

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

Very cold, very windy. Mt Roberts tram FAA sensor recorded 12.4 m/s gusting 19.5 m/s from 19.4 degrees (NNE) with a temperature of -21 degrees C at the time of the slide.

Snow surface

Looks like the freezing rain crust probably got obliterated on N-E aspects of Mt Juneau and Roberts.

Photos & Video
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