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Archived

Avalanche Forecast

Feb 27th, 2016–Feb 28th, 2016
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
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
1: Low
The avalanche danger rating below treeline will be low

Regions: Banff Yoho Kootenay.

A weak snowpack structure inspires very little confidence. Carefully consider your route and manage your group to minimize the potential for triggering.

Weather Forecast

Moderately cool temperatures and light snow for the next few days will hopefully begin to heal up the snowpack over the next few days.

Snowpack Summary

Treeline height of snowpack average values range from 100 to 170cm. The Feb 11 layer is of crust and isolated surface hoar is down 30 to 50cm. The Jan 6 layer of Faceted Crystals is the dominant snowpack feature and is down about 50-70cm. This layer is producing whumpfing, cracking and has been responsible for much of the recent avalanche activity.

Avalanche Summary

Natural activity seems to be tapering. No new avalanches to report.

Confidence

Avalanche Problems

Deep Persistent Slabs

Generally the snowpack has a weak midsection throughout the BYK region. Both the Feb 11 and Jan 6 layers produce significant shears in tests. Human triggering of large avalanches that  could step down to the ground is a real possibility.
Watch for signs of instability such as whumpfing, or cracking. Use conservative route selection, choose moderate angled and supported terrain with low consequence.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Possible

Expected Size: 1 - 3