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Avalanche Forecast

Archived

Feb 14th, 2021–Feb 15th, 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 unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely.

Regions

Glacier.

The wind changed direction in some drainages yesterday. Watch for windslabs in unusual places

Weather Forecast

Staying cold for today with a high of -14. The wind is forecast to be light from the SW, be aware of increasing winds if they occur. A low pressure system will move across the province over the next few days with increasing cloud cover and flurries of snow beginning tomorrow. Tuesday winds will pick up to moderate from the W.

Snowpack Summary

The cold has weakened 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 facetting due to the cold. The mid and lower snowpack are still relatively strong having rounded under previous mild temperatures and snow load.

Avalanche Summary

Numerous skier triggered and natural windslabs were observed from both lee and crossloaded features over the last few days 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.