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Observer Name: 
Greg Gagne
Observation Date: 
Saturday, November 18, 2017
Occurrence Date: 
Friday, November 17, 2017
Occurence Time: 
Afternoon
Region: 
Catherine's Pass
Location Name or Route: 
Catherine's Pass Area
Elevation: 
10000
Aspect: 
Northwest
Slope Angle: 
37
Trigger: 
Skier
Trigger: additional info: 
Remotely Triggered
Avalanche Type: 
Soft Slab
Avalanche Problem: 
Persistent Slab
Weak Layer: 
Graupel
Depth: 
15"
Width: 
100
Vertical: 
250
Comments: 

This avalanche occurred likely during a period of high PI and quickly overloaded a 5 cm (2-3") layer of graupel. Am unsure if was a natural or skier-triggered slide as there may have been some old ski tracks adjacent to the slide. (Any ski tracks, as well as the bed surface) had filled in with 5-10 cms of storm snow.

In speaking to Mark Staples afterwards - he said it perfectly "(despite the weak layer of faceted snow near the ground), the graupel was the weakest layer."

[EDIT - Updated information is that this was a skier-triggered slide that occurred during a period of intense precipitation on Friday afternoon. The skier reported skiing the slope from the safety of trees on the skier's right of the slide path. Midway down their run, the steep slope adjacent to them remotely avalanched.]

Coordinates: 
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