Quick report
- Slope Angle
- 40°
Avalanche
- Slab Width
- 244 m
- Weak Layer
- New Snow/Old Snow Interface
- Trigger Type
- Natural
- Avalanche Type
- Soft Slab
- Start Zone Aspect
- East
- Avalanche Problem
- New Snow
- Start Zone Elevation
- 2987 m
Observed many examples of natural and some human-triggered activity across the Butler Basin, Wilson and Alexander Basin drainages. Human-triggered were much less connected and widespread than yesterday. Naturals most likely occurred yesterday during the early afternoon frontal pulse, failed on facets of light new snow on M/F crust and were part of the same natural cycle that was observed in the upper Cottonwoods. The largest was this in upper east-facing Alexander Basin, connecting from the East Bowl to near the Gobbler's peak. Similar activity in the area ran on the pre-storm crust and was very sensitive during the high PI and winds of Sunday mid-day.
It is important to note that the natural and remote-trigger sensitivities seen yesterday were significantly settled out on the BCC/Millcreek ridgeline today and ski cuts produced storm slab results isolated to steep slopes and not connecting wider than ski width.
The weekend's snow (only layer of concern) in much of this area consists of 5" of upside-down snow (pre-frontal) with a graupel layer then 5" of light-density snow, all on top of a F+ thermal crust from last week.
Sensitivities today were primarily seen on the graupel layer with isolated sections failing on the crust ~10" down.
Butler Basin activity (some of which previously observed) occurred on many steeper lee slopes.
Ski cuts failed primarily within the storm snow, isolated to ski width, soft and slow-running. Storm snow stabilizing progressively.