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Archived

Avalanche Forecast

Mar 29th, 2017–Mar 30th, 2017
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
Treeline
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
2: Moderate
The avalanche danger rating below treeline will be moderate
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
Treeline
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
2: Moderate
The avalanche danger rating below treeline will be moderate
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
2: Moderate
The avalanche danger rating below treeline will be moderate

Regions: Little Yoho.

Pay attention to day time heating. Several loose snow avalanches were observed on solar aspects on Wednesday afternoon.

Weather Forecast

Thursday will bring a mix of sun a cloud and some isolated convective flurries. Winds will be light and freezing levels should reach 2000 m. A clearing trend is forecast for Friday with similar freezing levels.

Snowpack Summary

10-15cm of recent storm-snow sits on a well settled mid-pack. This in turn sits on a variety of foundations depending on location. In shallow areas (eg: Field ice climbs) the base is weak and facetted and shears persist on this interface. In deeper areas (eg: Little Yoho Valley), the base is much stronger.

Avalanche Summary

No reports were received of any new avalanche activity in the Field, Emerald Lake or Little Yoho areas.

Confidence

Avalanche Problems

Persistent Slabs

The snowpack is stabilizing after last week's cycle, and now we are left with a classic low probability, high consequence problem. Natural avalanches have mostly ceased, but triggering is still possible - especially from large loads like cornices.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible - Likely

Expected Size: 2 - 4

Cornices

There has been an increasing frequency of cornice failures this past week. Be wary of this as we transition into spring (cornice season).

  • Pay attention to overhead hazards like cornices which could easily trigger the deep persistent slab.

Aspects: North, North East, East, South East.

Elevations: Alpine.

Likelihood: Possible

Expected Size: 1 - 3

Wind Slabs

Fresh wind slabs can be expected in the alpine.

Aspects: North, North East, East, South East, South.

Elevations: Alpine.

Likelihood: Possible

Expected Size: 1 - 2