Detailed Observation

ObserverGareth Brown

General Observations

4/1- Iguana Backs up to 4500’/ W-N aspects/ Partly Cloudy.

Collapsing: No

Shooting Cracks: No

Avalanches: Yes.  Saw a natural hard slab avalanche on a west aspect halfway up an apron (4000′)/~38° slope/ 100 meters wide ran 200′ vertical to a flat bench. Crown ranged from 50-100 cms, and failed on 1-2mm near surface facets.  HS was 115 cms at a thin section of the crown (55cms).  Looked as though a moderate sized sluff triggered the slide. HS-N-R2 D2-O

In the valley found 10cms of warm new snow atop  hard wind affected snow with facets beneath.  Above 3000′ new snow was about 15-25 cms deep and was becoming drier.  Light NE wind began around 2000′ becoming moderate by 4500′ with 4 finger slabs building on the lee side of terrain features 20-30 cms deep.


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Observed Avalanche Activity