Avalanche: Other Regions

Location: Whittier/ Blackstone Bay

Date:

May 12, 2023 5:24pm

Observer:

Graham Predeger

Route & General Observations

Salt water cruise from Whittier into Blackstone Bay.

Avalanche Details

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Trigger	Natural	Remote Trigger	Unknown
Avalanche Type	Wet Slab	Aspect	South Southwest
Elevation	1800ft	Slope Angle	unknown
Crown Depth	unknown	Width	5000ft
Vertical Run	1000ft

Avalanche Details

Multiple Large wet slab in Blackstone Bay and Passage Canal (Poe Bay). All slabs were 1500-1800’ and looked like they ran on a similar mid-pack layer (pi interface, 3/14?). Impressive connectivity/ sympathetic releases spanning a mile plus wide and multiple aspects. Likely these avalanche ran yesterday (5/11) during or just after the storm.
Most avalanches looked to be triggered by wet loose/ cornice dribble and then subsequent slabs released sympathetically.

Red Flags

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Obvious signs of instability

Recent Avalanches?	Yes
Collapsing (Whumphing)?	No
Cracking (Shooting cracks)?	No

Weather & Snow Characteristics

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Weather

Mid 40’s high clouds and light rain this afternoon. No wind.

Photos & Video

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Poe Bay, Passage canal.

Blackstone bay.

Above Passage canal.

IMG_3389

Location

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