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Avalanche Forecast

Archived

Jan 21st, 2013–Jan 22nd, 2013

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.

Weather Forecast

Continued warm and dry for Tuesday. Cooling trend and light snowfall forecasted for Wednesday.

Snowpack Summary

Touchy windslabs that are reactive to human triggering exist in the alpine. Warm day time temperatures may cause these slabs to become more reactive. Extra caution on sunny slopes in the afternoon is warranted.

Avalanche Summary

Class 2 wind slab on north aspect at 2400 m near Bow Summit was triggered by skiers on Monday. A class 1.5 skier triggered wind slab  (north aspect, 2300m) on Observation peak in past 248 hours.

Confidence

Due to the number and quality of field observations

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.