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Payette Avalanche Center

Public Observation

Observation Details

Observation Date:
February 24, 2021
Submitted:
February 25, 2021
Zone or Region:
Council Mountain Area
Activity:
Skiing/Snowboarding
Location:
Granite Creek PAC Investigation

Observed Avalanches

Did you observe any avalanches? 
Yes
Avalanche Type:
Soft Slab
Size:
Size 2: Could bury, injure, or kill a person
Elevation:
7100
Aspect:
SE
Comments:
Avalanche investigation of a slide that buried a skier earlier in week
Photo:

Signs of Unstable Snow

None reported

Observations

A group of skiers triggered an avalanche on a steep SE face on 2/21(see earlier observation from that date). PAC forecasters went to the area to gather information to accompany an official report. The terrain was heavily wind-loaded and the tracks from the reporting party were barely visible. Layer of concern was the slick sun crust, facet combination at 70cm.

Media

Pit profile just above crown

Advanced Observations

Observed Avalanche Problem #1: 
Persistent Slab
Comments: 
Soft storm slab 15-30 cm thick with multiple weak layers present in upper snowpack, buried weak layer that was triggered by reporting party at 70 cm was a crust/facet combo buried formed 2/10-2/11. This layer has been relatively active since it was buried. PAC received several other reports of human-triggered avalanches on this layer on both 2/20 and 2/21. The avalanche hazard was rated at moderate on the day of the incident
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