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Avalanche Forecast

Archived

Feb 16th, 2021–Feb 17th, 2021

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

Regions

Little Yoho.

We have observed several cornice failures over the last few days. The recent cold snap has facetted and weakened them. Some of these failures have triggered slabs on the slopes below, others have not.

Give cornices an even wider berth than normal.

Weather Forecast

A few flurries & increased wind Tuesday night tapering by morning. For Wednesday, highs will be in the around -12C with light W-NW winds and a mix of sun & cloud. Thursday night will be clear and cold with lows in the -25 range and daytime highs -10 to -15. Temperatures will warmer through the weekend with flurries on Monday.

Snowpack Summary

Wind effect in the alpine with small isolated wind slabs. In sheltered areas, the surface snow is facetted and is sluffing more easily in steep terrain (40 degree). A facet layer from Jan 27th is present at treeline and in the alpine down 30-40. On steep south this layer may consist of a thin sun crust as well.

Avalanche Summary

Several cornice failures have been observed over the past few days including one on Fatigue Mountain on Sunday that triggered a size 3 to ground reminding us that there is still a deep layer. Forecasters ski cut a size 2 in the Simpson area at 2100 m on the persistent layer Saturday. SSV reports working with small stubborn windslabs in the alpine

Confidence

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.

Loose Dry

Loose Dry avalanches are the release of dry unconsolidated snow and typically occur within layers of soft snow near the surface of the snowpack. These avalanches start at a point and entrain snow as they move downhill, forming a fan-shaped avalanche. Other names for loose-dry avalanches include point-release avalanches or sluffs.