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Eastern Sierra Avalanche Center

Public Observation

Observation Details

Observation Date:
December 15, 2022
Submitted:
December 15, 2022
Zone or Region:
June Lake
Activity:
Skiing/Snowboarding
Location:
Mt Lewis

Observations

As we approached the intended descent we heard whumpfing on many aspects, though primarily north/northeast, some were observed from southeast slopes to northwest slopes. Several whumpfs displayed cracks that spread ~10+m and shook shrubs and small trees. The more aspects we traveled on the more concerned we became, which eventually led us to turn around and dig a pit to get a closer look. The pit at 9500ft, east aspect, and 25° slope angle, resulted in a CT12 SP at 66cm and ECTP 22 at 66cm. Our assumption was that the weak layer was still present on the southeast slope we had planned to ski due to the whumping on similar slopes and that skiing above exposure was unreasonable. Not only that but travel to the descent would be risky as well. The road ends at Aqueduct rd and Parker lake rd.

Signs of Unstable Snow

Did you see shooting cracks? 
Yes, Widespread
Did you experience collapsing or whumpfing? 
Yes, Widespread

Media

ECT Slab

Advanced Observations

Observed Avalanche Problem #1: 
Persistent Slab
Comments: 
While the chance of triggering appeared to be on the lower side, the consequence seems high, due to the amount of snow above the weak layer and the relative persistence of the layer, especially as the temperature gradients stay within ranges to encourage faceting.
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