Mt. Apps Natural Avalanche Activity

Avalanche date/time

Sunday, January 31, 2021 at 13:00

Number of avalanches in this report

2 to 5

The size of avalanche

1

Slab thickness

50cm

Slab width

10m

Run length

10m

Avalanche Character

• Persistent slab

Start zone aspect

• NE

Start zone elevation band

• Treeline

Start zone elevation

1,300m

Weak layer crystal type

• Surface hoar

Vegetation cover

Sparse trees or gladed slope

Three size 1 avalanches had recently released naturally on the NE ridge of Mt. Apps, around 1300m. All had occurred on small, unsupported convexities approximately NE in aspect, and all were within 50m in elevation of one another. Three other small convexities (these ones supported at the bottom) of similar aspect and elevation were tested by jumping near the top. No releases resulted.

Two large whoomphs were also heard throughout the day. One in a flat, loosely-treed meadow, the other at the treeline above a short open slope.