Outer Mongolia

Avalanche

Run Length

25

Slab Width

10

Trigger Type

skier

Avalanche Size

1

Slab Thickness

100

Trigger Sub Type

accidental

Start Zone Aspect

SE

Vegetation Cover

openSlope

Start Zone Incline

32

Avalanche Character

deepPersistentSlab, persistentSlab

Crust Near Weak Layer

1

Number Of Avalanches

2-5

Start Zone Elevation

1780

Runout Zone Elevation

36

Weak Layer Crystal Type

surfaceHoarAndFacets, stormSnow

Start Zone Elevation Band

btl

Avalanche Occurrence Datetime

2021-02-23T14:30:00

Incident

Group Size

2

Group Activity

skiing

Number Involved

1

Number Caught Only

1

Snow Depth Trigger Point

average

Terrain Shape Trigger Point

convex

Covering 2 avalanches in this report. The first, a size 1 loose dry slab, was the result of a 10:30 am ski cut above terrain that we had identified as hazardous. Our plan was to skin back up this aspect after skiing our objective, so we chose to ski this terrain on our way out, hoping to mitigate some of the risk. What started as sluff quickly picked up mass, and triggered a loose dry slab 30m below ski cut. We then proceeded to ski directly over a small convexity to skiers left of our loose dry slab, with no signs of instability. We moved on to ski our objective, and returned to this piece of terrain approximately 4 hours later. As we were travelling uphill, the first member of our party skinned over the small convexity, hearing a distinct whumph in the snow. The next person followed, hearing and feeling a second whumph, the next step taken triggered a slab to release. Top slab approximately 60cm, stepped down to approximately 100cm total.