Observation: Public
Observation Details
Name:
Josh HirshbergObservation Date:
December 19, 2020Submitted:
December 19, 2020Zone or Region:
Stevens PassActivity:
Skiing/SnowboardingLocation:
Lanham/Henry creekObserved Avalanches
Did you observe any avalanches?
YesAvalanche Type:
Size:
Size 2: Could bury, injure, or kill a personElevation:
Near treelineAspect:
NEComments:
Arrowhead, NE bowl. Possibly D2.5. Ran at least 500ft vertical w debris stopping ~4.7k. Suspect this was a slab, running on Dec 12th PWL. Poor viz and couldn't confirm crown.Signs of Unstable Snow
Did you see shooting cracks?
Yes, IsolatedDid you experience collapsing or whumpfing?
NoObservations
It appears there was a cycle of persistent slab avalanches overnight on Dec 18th on polar aspect. Mostly D2, some D2.5.
We stayed mostly below treeline. Found reactive fresh drifts on the ridge at 5.6k. Surface crust to 4.8k in the trees, maybe only to 4-4.2k in open terrain.
Profile at 5k, NNE:
Height of Snow (HS) 125cm
↓47cm Dec 12th facets (1.0mm), well-rounded
Test results did not indicate propagation at this location
Media
