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Avalanche Forecast

Archived

Mar 1st, 2021–Mar 2nd, 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

Little Yoho.

Although the snowpack is strong, recent snow and wind has created windslabs at the higher elevations. No recent natural avalanches have been noted and the snow quality is excellent BTL. Wed looks sunny and warm - watch out on solar facing terrain.

Weather Forecast

The westerly flow continues and will bring another 5 cm on Monday night with clearing by mid-day Tuesday. Expect the alpine winds to remain strong out of the west, also calming down on Tuesday afternoon. Wednesday and Thursday look beautiful; blue sky and warm.  Watch out for the sun's effects to the snowpack on Wednesday.

Snowpack Summary

Windslabs and wind effect dominate the surface of the snowpack above 2000 m, but otherwise at treeline and below the snowpack in Little Yoho is deep and strong with no obvious weak layers. The exception to this might be south aspects, where buried crusts may lurk and also the Mt Dennis area, where the snowpack is generally shallower.

Avalanche Summary

A skier triggered cornice on Emerald Peak initiated a size 2 avalanche Sunday that ran part way down the Emerald Lake Slide Path. This is the second report of a cornice release in this region over the weekend.

Confidence

Timing or intensity of solar radiation is uncertain on Wednesday

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.