Avalanche Occurrence

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General Information

Investigating the crown of a skier triggered avalanche. It ran 250ft vertical on the interface of the new /old snow ↓40cm broke about 75 feet wide. SS-AS-R1-D1-I. 5180ft, SE, Big Chief Mtn

Observer:

NWAC Forecaster

Occurrence Date:

Dec 11, 2021 11:15 am ()

Location:

Stevens Pass, SPMR- Aquarius run

Comments:

Triggered by 2nd skier from a shallow convexity on the leeward side of the ridge. Ran slow but far for the size of the start zone.

Avalanche Characteristics

# of Avys:

1

Aspect:

SE

Start Zone Elev:

5180ft

Size:

D1 / R1

Type:

SS-Soft Slab

Trigger:

AS-Skier

Bed Surface:

S-New Snow

Depth:

1.5ft

Width:

80ft

Start Zone Slope:

40°

Vertical Fall:

250ft

Comments:

Ran on a mid-storm layer. This slope received very subtle recent wind-loading. See associated observation and profile

Media

Investigating the crown of a skier triggered avalanche. It ran 250ft vertical on the interface of the new /old snow ↓40cm broke about 75 feet wide. SS-AS-R1-D1-I. 5180ft, SE, Big Chief Mtn

At the crown of a skier triggered avalanche. SS-AS-R1-D1-I. 5180ft, SE, Big Chief Mtn

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