Chugach State Park – Front Range – Powerline Valley – South Ship Lake Pass
Human triggered hard slab avalanche. Early season Chugach State Park snowpack is extremely variable and weak with multiple weak layers and interfaces (basal facets and depth hoar, melt-freeze crusts, buried surface hoar and faceted layers). Recent dense wind slabs have developed on top of these weak layers and interfaces. Weak layers and interfaces are widespread, and proving reactive to human triggers.
Avalanche details
| Trigger | Foot Penetration | Avalanche Type | Hard Slab | Aspect | Southwest |
|---|---|---|---|---|---|
| Elevation | 3600ft | Slope Angle | 34deg | Crown Depth | 12in |
| Width | 600ft | Length | 350ft |
Obvious signs of instability
| Recent Avalanches? | No | Collapsing (Whumphing)? | No | Cracking (Shooting cracks)? | Yes |
|---|
Comments
Active wind loading: wind slab developing over hard, slick melt-freeze crust (weak interface) and area of old exposed near-surface facets.
Snow surface
Highly variable: dense wind-packed, soft powder, hard melt-freeze.
Snowpack
Extremely variable.
