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Avalanche Forecast

Archived

Apr 20th, 2022–Apr 21st, 2022

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

Regions

Little Yoho.

Convective flurries over the next few days may mean more snowfall in certain areas. Be on the lookout for wind effected snow if venturing into steeper alpine terrain. This has been more reactive in the Lake Louise Ski Hill area than other areas.

Weather Forecast

Stable weather pattern over the next few days but the forecast of convective snow may bring locally variable precipitation in the afternoons. Thursday looks to start cold and clear with light precip in the afternoon, but Friday looks to be significantly more with some areas calling for 20-30 cm and others ~ 5cm. Winds remain generally light.

Snowpack Summary

10-20 cm of new snow with some wind effect at treeline and in the alpine overlies a variety of surfaces from the early April drought. These buried surfaces include wind effected and facetted snow on north aspects and higher elevations (>2500m) and multiple crusts on solar aspects and lower elevations.

Avalanche Summary

Good visibility on a trip to the Bow Summit area today showed evidence of a small natural avalanche cycle that occurred on Tuesday. Most avalanches seemed to be loose dry out of steep alpine terrain with the occasional wind slab in more moderate terrain. Generally size 1-1.5.

LL ski patrol reported numerous skiier controlled avalanches to size 1.5

Confidence

Timing, track, or intensity of incoming weather system is uncertain

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.