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Archived

Avalanche Forecast

Feb 27th, 2012–Feb 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
3: Considerable
The avalanche danger rating below treeline will be considerable
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
3: Considerable
The avalanche danger rating at treeline will be considerable
Below Treeline
2: Moderate
The avalanche danger rating below treeline will be moderate

Regions: Banff Yoho Kootenay.

Lots of settlements on the Valentines surface hoar today, and some areas are just reaching threshold amounts over this layer to become active. Most slopes are waiting for someone to trigger them, and this will be the case for quite some time. SH

Weather Forecast

Snowpack Summary

Avalanche Summary

Confidence

Due to the number of field observations on Monday

Avalanche Problems

Persistent Slabs

Snow averages over the Valentines surface hoar and suncrust on steep solar aspects range from 20cm, to over 60cm at Sunshine and Yoho. Lake Louise ski hill reported a natural cycle last night out of bounds to sz. 2., caused by a wind event.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Likely

Expected Size: 2 - 3

Wind Slabs

Moderate winds in the past few days have also created thin, but stiffer wind slab conditions 25-35 cm deep on ridgetop lee terrain. These have been seen to step down to the surface hoar layer.

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

Elevations: Alpine.

Likelihood: Possible - Likely

Expected Size: 1 - 2

Deep Persistent Slabs

On Observation Peak today, we encountered moderate, sudden collapse shears on basal depth hoar. Steep, thin areas mainly E. of the divide will be prone. Lake Louise reported recent, isolated slides triggered on surface hoar which stepped to ground.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1 - 2