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Avalanche Forecast

Archived

Mar 20th, 2015–Mar 21st, 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, human triggered possible.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.

Regions

Little Yoho.

The new snow has improved ski conditions at treeline and above. Watch for increasing hazard as wind slabs develop on specific terrain features and keep an eye on cornice development over the weekend. Travel remains a bit rugged at lower elevations.

Weather Forecast

Light snow and mild temperatures with moderate SW winds are forecast through Saturday. Sunday we expect a mix of sun and cloud with cooler temperatures. Monday and beyond look unsettled with occasional light precipitation.

Snowpack Summary

5-10cm of new snow on Friday with moderate SW winds. Wind slabs up to 35cm deep are present in immediate lee areas of the alpine. The mid pack and base of the snowpack are well settled and well bonded overall. Surface crusts and/or moist snow exist below 1900m.

Avalanche Summary

Several skier triggered small wind slabs in immediate lee features were reported by the local ski areas on Friday. We expect this problem to increase slightly over the weekend.

Confidence

Intensity of incoming weather systems is uncertain on Saturday

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.