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Avalanche Forecast

Archived

Feb 21st, 2022–Feb 22nd, 2022

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

Regions

Glacier.

A new persistent weak layer is buried within human-triggerable depths. Put your thinking caps on, don't blindly follow other tracks.

Cold temps warrant bringing extra clothes/gear and a repair kit. Hypothermia is a real danger at -25*C!

Weather Forecast

The cold is here, blown in by the Northern winds.

Tonight: Clear, cold! -27*C, mod E winds

Tues: Sun and clouds, Alp high -21*C, light E winds

Wed: Cloudy with sun and isolated flurries, Alp high -18*C, light W winds

Thurs: Mix of sun/cloud, Alp high -13*C, light/mod NW winds

Snowpack Summary

40-60cm of storm snow over the weekend, more on the west side of the Park than the east. Wind affected snow in the alpine and down into tree line, with strong N'ly winds reverse loading on S'ly aspects . The Feb 15 surface hoar (2-8mm) is down 50-80cm and most prevalent below tree line. The Jan 29 surface hoar is down 80-130cm and breaking down.

Avalanche Summary

Reports of skiers triggering the slabs at Treeline and below in steep, unsupported terrain on the Vaux Moraine, Mushroom People, and Connaught Ck.

On Sat, natural avalanches to size 3 and artillery controlled avalanches to size 3.5 were observed. The Feb 15 surface hoar layer was active during this cycle, pulling slabs at lower elevations.

Confidence

Due to the number of field observations

Problems

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.

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.