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Avalanche Forecast

Archived

Feb 13th, 2021–Feb 14th, 2021

Alpine
Natural avalanches possible, human triggered probable.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches possible, human triggered probable.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches possible, human triggered probable.
Treeline
Natural avalanches possible, human triggered probable.
Below Treeline
Natural avalanches unlikely, human triggered possible.

Regions

Glacier.

Continued strong north winds have loaded lee features in the alpine with lots of facetted snow that's available for transport

Weather Forecast

Staying cold for the next 2 days with highs of -17. The north wind is forecast to ease off today and a stronger low pressure system is due Sunday night to turn the temperature up a bit with accompanying cloud cover and traces of snow on Monday.

Snowpack Summary

The cold has been weakening cornices and the upper snowpack. Widespread wind effect in the alpine has made for variable travel. The January weak interface down 70-100 is reducing in strength with increasing facetting. The mid and lower snowpack are still relatively strong having rounded under previous mild temperatures and snow load.

Avalanche Summary

Several skier triggered and natural windslabs were observed from both lee and crossloaded features yesterday to sz 2.5.

A group of skiers had a close call Wednesday on the South face of Corbin Peak, triggering a couple of large avalanches on the Jan 24th persistent weak layer.

Confidence

The weather pattern is stable

Problems

Wind Slabs

Wind Slab avalanches are the release of a cohesive layer of snow (a slab) formed by the wind. Wind typically transports snow from the upwind sides of terrain features and deposits snow on the downwind side. Wind slabs are often smooth and rounded and sometimes sound hollow, and can range from soft to hard. Wind slabs that form over a persistent weak layer (surface hoar, depth hoar, or near-surface facets) may be termed Persistent Slabs or may develop into Persistent Slabs.

Persistent Slabs

Persistent Slab avalanches are the release of a cohesive layer of snow (a slab) in the middle to upper snowpack, when the bond to an underlying persistent weak layer breaks. Persistent layers include: surface hoar, depth hoar, near-surface facets, or faceted snow. Persistent weak layers can continue to produce avalanches for days, weeks or even months, making them especially dangerous and tricky. As additional snow and wind events build a thicker slab on top of the persistent weak layer, this avalanche problem may develop into a Deep Persistent Slab.