Sawtooth Avalanche Center

Avalanche Occurrence

View Associated Field Report

General Information

A natural avalanche that occurred at lower elevations near the base of Copper Mountain in the Banner Summit zone. It broke 16

Observer:
SAC Forecaster

Verified by SAC?
Yes

Occurrence Date:
Dec 21, 2020 (+/- 1 day)

Location:
Base of Copper Mtn

Avalanche Characteristics

# of Avys:
1
Aspect:
N
Start Zone Elev:
7100ft
Size:
D1.5
Type:
SS-Soft Slab
Trigger:
N-Natural
Bed Surface:
O-Old Snow
Depth:
0.5ft
Vertical Fall:
100ft
Weak Layer:
Dec 11, 2020 (FCsf)
Comments:

Surface hoar layer (12/13?) present but fracture appeared to occur below that in 12/11 facets.

Media

A natural avalanche that occurred at lower elevations near the base of Copper Mountain in the Banner Summit zone. It broke 16" deep on the 12/11 facets. 7100', N.
Crown profile of a low elevation avalanche near the base of Copper Mountain in the Banner Summit zone. It broke 16" deep on the 12/11 facets. A stripe of surface hoar (12/13?) is visible but the avalanche seems to have broke in the 12/11 facets below it. 7100', N.