- Submitted by
- goinupthegranby
- Observations date
- Wednesday, December 29, 2021 at 20:00
- Location
- 49.162333° N 117.892549° W
- Reporting on
- Snow conditions
/-117.89254862367034,49.162332565140105,8,0,0/1026x200?access_token=pk.eyJ1IjoiYXZhbGFuY2hlY2FuYWRhIiwiYSI6ImNqd2dvZmUxdzE4ZWg0M2tkaXpuNG95aTQifQ.pBLM87fE3sIxRJqJT7Bf7g "Plewman avalanche")
Quick
Avalanche
Snowpack
Weather
Incident
Information
- Avalanche date/time
- Tuesday, December 28, 2021 at 16:00
- Estimated occurrence time of avalanche
- From 24 to 48 hours ago
- Number of avalanches in this report
- 1
- The size of avalanche
- 3
- Slab thickness
- 100cm
- Slab width
- 200m
- Run length
- 600m
- Avalanche Character
- Persistent slab
- Trigger type
- Natural
- Start zone aspect
- NE
- Start zone elevation band
- Treeline
- Start zone elevation
- 2,100m
- Start zone incline
- 40°
- Runout zone elevation
- 1,850m
- Wind exposure
- Cross-loaded slope
Comments
Large slab visible from Highway 3B on N side of Mt Plewman, debris running full path to edge of forest with some smaller broken trees noted.
Wind loaded slope including visible cross loading, suspect trigger was wind loading as no evidence of ski tracks into slab but debris ran across recent uptracks.
Suspect approx 24hrs old but could be 48 or more.
Slab depth estimate 50cm to 120cm, suspect failure was on Dec 4 atmospheric river crust.
