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Archived

Avalanche Forecast

Jan 27th, 2012–Jan 28th, 2012
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
Treeline
3: Considerable
The avalanche danger rating at treeline will be considerable
Below Treeline
2: Moderate
The avalanche danger rating below treeline will be moderate
Alpine
4: High
The avalanche danger rating in the alpine will be high
Treeline
4: High
The avalanche danger rating at treeline will be high
Below Treeline
3: Considerable
The avalanche danger rating below treeline will be considerable
Alpine
4: High
The avalanche danger rating in the alpine will be high
Treeline
3: Considerable
The avalanche danger rating at treeline will be considerable
Below Treeline
3: Considerable
The avalanche danger rating below treeline will be considerable

Regions: Banff Yoho Kootenay.

Sat. afternoon into Sunday, expect 30-40cm W. of the divide, and 20-25cm E. of the divide, with strong SW winds and 1600m freezing levels. We expect a natural cycle starting Sat. evening, but hazard may rise to high as soon as the storm arrives.SH

Weather Forecast

Snowpack Summary

Avalanche Summary

Confidence

Due to the quality of field observations on Friday

Avalanche Problems

Wind Slabs

At treeline 40-50 cm of settled storm snow sits overtop of the Jan 20 facet interface. Avy control in Yoho produced avalanches to sz.3 on this layer today. Expect this to become more touchy as snow load increases.

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

Elevations: Alpine, Treeline.

Likelihood: Likely

Expected Size: 1 - 3

Storm Slabs

Expect 10-15 cm over the day Saturday, with intensity picking up in the afternoon. Watch locally for timing of this snow. Loading will increase sensitivity to triggering wind slabs, and intense sloughing will occur in steeper terrain.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Likely

Expected Size: 1 - 2

Persistent Slabs

In most parts of the forecast area a settled midpack overlies a weaker facetted base. This has been less reactive of late, but thin areas E. of the divide will be most susceptible to triggering. Likelihood will increase this weekend.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Unlikely - Possible

Expected Size: 2 - 3