Deep, but reactive!

Quick report

robin.mazenc · Mar 20, 2025 · Ymir

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Observation photo 1Observation photo 2Observation photo 3Observation photo 4

Quick report

Weather
stormy, cloudy
Ride Type
mellowSlopes, denseTrees, openTrees
Stayed Away
alpineSlopes
Riding Quality
amazing
Snow Conditions
deepPowder
Avalanche Conditions
avalancheConditionSnow

Fantastic riding in the Whitewater backcountry. We kept it mellow, riding open tree hallways and (trying) to stay away from steeper convexities. One rider went for a short ride after popping a side 1 storm slab (see incident).

Weather

Wind Speed
windSpeedModerate
Blowing Snow
light
Sky Condition
brokenClouds
Snowfall Rate
2
New Snow24 Hours
20
Temperature Trend
steady
Precipitation Type
snow

Snowpack

Depth
260
Obs Type
point
Site Aspect
NW
Test Fracture
sudden
Site Elevation
2030
Test Initiation
easy
Site Elevation Band
tln
Surface Conditions
newSnow

Dug a quick pit at 2030m ish. Two notable results. One easy (6) result on the recent storm snow, about 20cm down. A second moderate (mod 2/12) result, 45cm down. Both were sudden plannar.

Avalanche

Run Length
30
Slab Width
5
Trigger Type
skier
Wind Exposure
noWindExposure
Avalanche Size
1
Slab Thickness
25
Trigger Sub Type
accidental
Start Zone Aspect
NW
Vegetation Cover
sparseTrees
Start Zone Incline
40
Avalanche Character
stormSlab
Number Of Avalanches
1
Start Zone Elevation
1850
Runout Zone Elevation
1820
Avalanche Observation
12hrsAgo
Weak Layer Crystal Type
stormSnow
Start Zone Elevation Band
btl
Avalanche Occurrence Datetime
2025-03-20T10:13:00.000Z

Incident

Terrain Trap
trees
Group Activity
skiing
Snow Depth Trigger Point
deep
Terrain Shape Trigger Point
convex

Rider cut above a steeper convexity in open trees and triggered a size one storm slab (see photos). Rider rode the slide on their butt for a few meters before stopping, with no consequences. Slide ran for about 30m. Crown was about 20cm/30cm deep.