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Avalanche Forecast

Archived

Dec 28th, 2015–Dec 29th, 2015

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.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.

Regions

Sea To Sky.

Avoid exposure to terrain traps where the consequences of a small avalanche could be serious.

Confidence

High

Weather Forecast

A ridge of high pressure has set up over the province and will bring mainly clear skies for the forecast period. Ridgetop winds should remain light while freezing levels should hover around valley bottom for all 3 days.

Avalanche Summary

On Sunday and Monday, size 1 soft wind slabs were ski cut in steep, unsupported terrain. The new avalanches formed in response to new snow and wind.

Snowpack Summary

Since Saturday, the region received 15-20cm of new low-density snow. At higher elevations, generally moderate southeasterly winds have redistributed much of that snow into soft wind slabs in exposed lee terrain. In the upper 70cm of the snowpack you may find a layer of weak surface hoar which was the culprit with a recent avalanche on an east aspect at treeline in the Fitzsimmons Range. Reports indicate this layer is spotty in its distribution, but may be something to watch as the overlying slab gets deeper and gains cohesion through settlement, storm loading and wind pressing.The mid and lower snowpack are generally considered to be strong and well-settled.

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.