Observation: Public
Observation Details
Name:
Manning-Hough-SneeObservation Date:
January 5, 2021Submitted:
January 5, 2021Zone or Region:
East CentralActivity:
Skiing/SnowboardingLocation:
TronsenheadObserved Avalanches
Did you observe any avalanches?
YesAvalanche Type:
Soft SlabSize:
Size 3: Could bury and destroy a car, damage a truck, destroy a wood frame house, or break a few treesElevation:
5800'Aspect:
NComments:
The northerly cornice on Tronsenhead broke sometime in the last 24-hours above a 40-degree slope, triggering a sympathetic release that broke widely across the slope. Initially we thought it was a wind slab, but given that it ran 300' wide and long, it's more likely to have failed on the 12/21 crust, and possibly facets below. A few mature trees transported to mid-slope in the debris. SS-N-R3-D3.Photo:
Signs of Unstable Snow
Did you see shooting cracks?
NoDid you experience collapsing or whumpfing?
Yes, IsolatedObservations
HS 50cm-90cm. Bottom ~20cm were large facets. Collapses locally to 30' in flat terrain above 5600' on poor structure. Small wind slabs noted on steep slopes at elevations above 4800' (SS-N-R1-D1). We observed a large wind slab on Windy Knob, N, 5800' that ran 200' in a gully below the corniced ridge (SS-N-R2-D2). 12/21 notable in snowpack when poling, with distinct punch below to facets. Quick pre-work outing, so didn't dig formally.
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