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Avalanche Forecast

Archived

Feb 22nd, 2022–Feb 23rd, 2022

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

Regions

Glacier.

Stronger than forecasted N'ly winds have continued to build wind slab in the Alpine and Treeline on solar slopes. Be aware of  reverse-loading on slopes.

Prep for the cold; keep those digits warm, carry a thermos, and take an extra layer or two!

Weather Forecast

Continuing cold, with a gradual warming to seasonal temps by the weekend

Tonight: Clear, -20*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

Fri: Cloud with sunny periods, Alp high -11*C, light W winds

Snowpack Summary

New snow over the weekend is being redistributed by strong N'ly winds throughout the park. Wind effected snow in the Alpine and down into Treeline on many open, exposed aspects. The Feb 15 surface hoar/solar crust is down 50-80cm and most problematic at and below Treeline. Cold temps are promoting surface faceting, softening the surface slabs.

Avalanche Summary

Human triggering of avalanches to sz 2 at Treeline and below in steep, unsupported terrain on Avalanche Crest, Vaux Moraine, and cracking around skis along the top of Griz Shoulder.

A natural avalanche cycle to sz 2.5 occurred Mon from the N'ly winds, with observations in Frequent Flyer, the Ravens, Cougar Corner paths, and Griz Couloir.

Confidence

Wind effect is extremely variable

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.