Avalanche
- Slab Width
- 30 m
- Trigger Type
- Natural
- Vertical Fall
- 91 m
- Avalanche Type
- Soft Slab
- Slab Thickness
- 46 cm
- Start Zone Aspect
- Southwest
- Avalanche Problem
- Wind Slab
- Start Zone Elevation
- 3475 m
First photo below is the slide with the location marked and the one dimensions are shown for. Guessing 12-24" depth. Hard to tell since crown and debris was already blown in.
Both Mt Holly and Lake Peak were covered with about 24" of new snow from the Wed to Fri storms. Photo below is of the West side of Mt Holly covered with snow on 3/13 Saturday afternoon prior to wind event.
A strong wind event Saturday night and/or Sunday morning eroded almost all of the new snow on exposed NW and W aspects and deposited the snow onto SW to
SE aspects (and probably East as well), and cross loaded some areas. Photo below is of West side of Mt Holly Sunday 3/14 after wind event.
This wind event caused a widespread natural avalanche cycle. I observed about a half dozen slides from my vantage points - all seemed to be D1 to D2. The wind had already filled in much of the evidence, so hard to provide accurate details. I'm guessing the largest slides ran 500' vertical feet or more and were a couple hundred feet wide. Elevations were all above 11,000'. Sorry for the poor photos - didn't have the good camera with me.