Observation: Public
Observation Details
Name:
Dallas GlassObservation Date:
December 31, 2020Submitted:
December 31, 2020Zone or Region:
West SouthActivity:
Skiing/SnowboardingLocation:
White Pass BackcountryTriggered Avalanches
Did you trigger any avalanches?
YesWas it intentional?
NoAvalanche Type:
Hard SlabSize:
Size 2: Could bury, injure, or kill a personElevation:
6300Aspect:
NEComments:
We unintentially triggered a cornice form well back on the ridgeline. The falling block then triggered a widely propagating slab avalanche. Gunsight Bowl NE-E aspects. Crown 30-60+cm deep and more than 200yds wide. HS-ACu-D2.5-R3-I.Photo:
Observed Avalanches
Did you observe any avalanches?
YesAvalanche Type:
Hard SlabSize:
Size 1: Relatively harmless to peopleElevation:
6100Aspect:
EComments:
Just left of the large avalanche above, a smaller avalanche was triggered by several skiers. This slide was only 20cm (8") deep and about 30' (10m) wide.Signs of Unstable Snow
Did you see shooting cracks?
Yes, IsolatedDid you experience collapsing or whumpfing?
Yes, IsolatedObservations
Snowpack observations showed 40-50cm of recent snow over the 12/29 interface. In the location where we dug this was buried surface hoard and small needles. Snowpack test failed with sudden planar results. In the photo. The black card denotes the 12/29 and the blue card marks the 12/21 interfaces.
Winds were activity blowing snow along ridgecrest. Several smaller wind loaded slopes failed with ease and produced cracking or small avalanches.
Media
