Quick report
- Cracking
- specific
- Collapsing
- specific
After a small cycle of storm/wind slabs over the past 24 hours, slabs were still sensitive today on some terrain features. Snowmobile and ski cuts produced shooting cracks up to 2' thick on leeward terrain features and triggered slabs about a foot thick on steep rollovers on more sheltered slopes. We hunted for feedback on relatively small and inconsequential slopes while avoiding larger terrain or terrain traps. Slab instabilities were quieter below treeline due to thinner, less developed slabs. A thin layer of facets is buried below the storm snow on some slopes, while others don't have it - no clear pattern yet.
Triggered several shooting cracks on steep, windloaded test slopes NTL. On low-angle terrain, we felt occasional muffled collapses on facets below the storm snow on E, NE, and SW aspects. Collapses were more common when a thin, harder layer of wind drifted snow capped the facets (from pre-storm wind events).Weather
- Cloud Cover
- scattered
- Wind Loading
- previous
- Recent Snowfall
- 50
- Snow Avail For Transport
- large amounts
Cloud cover increased midday. Cool temps. Previous moderate drifting, most recently from northerly winds. Settled storm totals increased from 30 cm below treeline to 50 cm above treeline.
Snowpack
I was trying to find a pattern of where storm slabs formed over facets, but it wasn't abundantly clear. In hand pits, I found concerning structures and produced occasional collapses on SW, E, and NE aspects NTL, and not N, SE, or S. Areas that saw wind drifting before the main snowfall event were most concerning because they held a thin layer of stiff, drifted snow above the facets, creating a more abrupt hardness change. I found the buried facets below treeline, but the slabs weren't well-developed and didn't provide any feedback. Snow surfaces became moist on sunnier aspects at mid to low elevations from morning solar.
Avalanche
- Size
- D1.5
- Type
- SS
- Count
- 21
- Aspect
- E
- Trigger
- N
- Elevation
- 11300 ft
Over the past 24 hours, many soft slab avalanches ran naturally in the new snow, including a couple today due to solar warming. These were mostly near/above treeline and D1 to D1.5, with a few D2s. Today, I triggered a couple of storm slabs about a foot thick (up to D1.5) in relatively sheltered terrain and a small wind slab on a drifted test slope. These were all near treeline.

