| Trigger | Natural | Avalanche Type | Soft Slab |
| Aspect | South | Elevation | 2600ft |
| Slope Angle | unknown | Crown Depth | unknown |
| Width | 300ft | Vertical Run | 2500ft |
Avalanche: Juneau Mainland
Location: Chop Gully
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
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:
https://youtu.be/rTQbvotlEvg
https://youtu.be/wDjyyZyY-p0
https://youtu.be/nXpCzkm8fAo
Obvious signs of instability
| Recent Avalanches? | Yes |
| Collapsing (Whumphing)? | No |
| Cracking (Shooting cracks)? | No |
Observer Comments
Strong wind loading.
Weather
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.
Mike Janes photo ~30 mins after avalanche. Almost R1 but then what would I call the smaller slides I see in this path?
SnowCloud screen shot (difficult to hit pause at the exact right time to get the most dramatic image)
Another angle