Avalanche
- Weak Layer
- Density Change
- Trigger Type
- Natural
- Avalanche Type
- Hard Slab
- Start Zone Aspect
- East
- Avalanche Problem
- Wind Slab
- Start Zone Elevation
- 3139 m
Due to very poor visibility throughout the entire day for potential observations, specific information regarding this avalanche is very limited. Upon ascension of the ridge leading up to the the Marco Polo Peak it was possible to see a significantly sized avalanche and it's right flank. The flank descended down just under the steep cliff line and it was only possible to barely see it in pieces due to the OVC skies and in and out fog/mist. Unfortunately when returning the same way around 1400 hours the visibility was not any better.
Of note, the entire structure from the storm was upside down with the lighter density snow that fell initially in the first wave of the storm still observable with probing and hand pits/shears. On a positive note, the HST of at least 70 cm was supportable for excellent riding due to how the Southerly winds had packed and settled the new snow. This allowed for ski penetration of 20 to 25 cm with excellent surfy turning and riding. Riding was mostly on moderate to low angle slopes with no other signs of instability noted/observed. The slab created by the previously cited winds appeared to be stable in this location, yet it was likely that on steep slopes with similar structure the potential for similar Wind Slab avalanche problems was Very Likely.
Also of note, the WSW Winds on the exposed ridgelines were sustained at Strong speeds with the Extreme Gusts resulting in Intense Blowing Snow.