More persistent slab action at Irwin

CBAC 2020-21 Observations

Date of Observation: 02/24/2021
Name: Zach Guy


Zone: Northwest Mountains
Location: Irwin Tenure
Aspect: South West
Elevation: NTL


Avalanches: Explosive triggered another large hard slab failing near the ground on a southwest aspect near treeline. The crown was 2 to 4 feet thick, failing on basal facets. HS-AB-R3-D2.5-O/G.
Also a noted a handful of smaller slabs in the Ruby Range that likely ran a few days ago during the wind loading event. They were relatively shallow slabs that broke in very steep, rocky terrain on easterly aspects above treeline (D1.5), likely on old layers as well.