The wind has won

Avalanche

Megan Kelly · Dec 16, 2016 · Flathead

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Observation photo 1

Quick report

Weather
cold, windy
Stayed Away
alpineSlopes
Riding Quality
ok
Snow Conditions
powder, windAffected

Last week's unconsolidated snow has been transformed into windslabs at treeline and in the alpine changing the way we have been thinking about and using terrain. Today we avoided any wind effected slopes. We came across an avalanche from yesterday and were surprised to see how far it spread across the slope; (see avalanche summary tab for details). December's cold weather has created sugary crystals in the snowpack that are weak. With the new wind slab above, this combination could create avalanches big enough to do damage.

Avalanche

Run Length
100
Slab Width
200
Trigger Type
natural
Wind Exposure
crossLoadedSlope
Avalanche Size
2
Start Zone Aspect
NE
Vegetation Cover
openSlope
Start Zone Incline
40
Avalanche Character
windSlab
Number Of Avalanches
1
Start Zone Elevation
2000
Runout Zone Elevation
1900
Avalanche Observation
12to24hrsAgo
Weak Layer Crystal Type
facets
Start Zone Elevation Band
alp
Avalanche Occurrence Datetime
2016-12-16T01:00:00

We suspect it was triggered from SW winds sometime on Dec.15