Touchy eastern aspects at treeline

Avalanche

steve.hort · Mar 1, 2020 · Gold

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Observation photo 1Observation photo 2

Quick report

Weather
cloudy, sunny
Riding Quality
good
Snow Conditions
powder
Avalanche Conditions
avalancheConditionSlab

2 separate avalanches on the same day. Both on east facing aspects at treeline triggered naturally. We found them on our way back at the end of the day on Sunday. Looked recent, within 12 hours. Approx 30cm crowns propagated across the entire face. Suspect persistent slabs on buried surface hoar layer. No activity above treeline on similar aspects.

Weather

Wind Speed
windSpeedCalm
Blowing Snow
none
Sky Condition
scatteredClouds
New Snow24 Hours
5
Temperature Trend
steady
Precipitation Type
none

Avalanche

Run Length
100
Slab Width
100
Trigger Type
natural
Avalanche Size
2
Slab Thickness
30
Start Zone Aspect
E
Vegetation Cover
sparseTrees
Start Zone Incline
35
Avalanche Character
persistentSlab
Number Of Avalanches
2-5
Start Zone Elevation
2000
Runout Zone Elevation
1900
Avalanche Observation
12hrsAgo
Weak Layer Crystal Type
surfaceHoar
Start Zone Elevation Band
tln
Avalanche Occurrence Datetime
2020-03-01T14:00:00

2 separate avalanches on the same day. Both on east facing aspects at treeline triggered naturally. We found them on our way back at the end of the day on Sunday. Looked recent, within 12 hours. Approx 30cm crowns propagated across the entire face. Suspect persistent slabs on buried surface hoar layer. No activity above treeline on similar aspects.