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Archived

Avalanche Forecast

Jan 23rd, 2017–Jan 24th, 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
1: Low
The avalanche danger rating below treeline will be low
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
1: Low
The avalanche danger rating below treeline will be low
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
1: Low
The avalanche danger rating below treeline will be low

Regions: Banff Yoho Kootenay.

Weather Forecast

Tuesday will bring a mix of sun and cloud with day time highs in the alpine around -10. Winds are forecast to be light and freezing levels will be near the surface.

Snowpack Summary

20-30 cm of settled storm snow overrides a generally weak and facetted midpack and base. Closer to the divide and in deeper snowpack areas the midpack is more supportive. Some lingering windslabs exist in the alpine.

Avalanche Summary

Avalanche control in Yoho Park today (Mt Bosworth, Mt Stephen, and Mt Dennis) produced numerous size 2 and 2.5 avalanches. One size 3 avalanche was triggered on Mt Bosworth. These avalanches were either storm slabs or wind slabs that stepped down into a lower facet layer.

Confidence

Avalanche Problems

Deep Persistent Slabs

The midpack in most areas is weak and facetted. Any slab sitting overtop of this weakness should be considered suspect. There is a high level of uncertainty and variability concerning this layer.
Carefully evaluate terrain features by digging and testing on adjacent, safe slopes. Be aware of thin areas that may propogate to deeper instabilites.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 2 - 3

Wind Slabs

Small windslabs persist in lee alpine areas. Watch for these wind slabs as you approach ridge-tops and cross-loaded features.
If triggered the wind slabs may step down to deeper layers resulting in large avalanches.

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

Elevations: Alpine, Treeline.

Likelihood: Possible - Likely

Expected Size: 1 - 2