Anthracites avalanches from a week ago

CB Avalanche Center 2017-18 Observations

Location: Kebler Pass Area
Date of Observation: 01/20/2018
Name: Ben Pritchett & Jeff Deems

Subject: Anthracites avalanches from a week ago
Aspect:
Elevation: 10,000 to 12,000′

Avalanches:

Several old avalanches from Jan 11-13 period:
Below 7 Bowl x 3, Northwest Bowl, Playground x 3, ridge that divides Floresta and Bracken, Ohio Peak SE face.

Weather: Approaching weather. Convective showers started around 11am, under a strong south flow. No significant accumulation or wind transport until around 3pm.
Snowpack: North through east aspects were settled and quiet, topped with large and durable surface hoar (up to 3cm). HS averaged 110.
On southerly aspects found thick slick melt-freeze crusts up to 11,500′, thin zipper sun crust observed from 11,500 – 12,000′.
No cracking, collapsing or fresh avalanches.

Photos:

crown profile above NW bowl slide

very broad crown, estimated ~1,200′ wide

North end of the crown in NW bowl

D2 on SE aspect off Ohio Peak

Broad avalanche in relatively low angled terrain

the largest of 3 D2’s in the Playground

looking across at the Northwest bowl avalanche

Large durable SH (3cm)

D1.5 on small slope below 7 bowl

Surface Hoar, in most open slopes on Northwest to East aspects up to 11,500′