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Avalanche Forecast

Jan 6th, 2012–Jan 7th, 2012
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
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
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
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: Sea To Sky.

Confidence

Fair - Intensity of incoming weather is uncertain

Weather Forecast

Saturday: 6-8cm of snow arriving late in the day / moderate to strong southwest winds / freezing level at 1600mSunday: 15-20cm of snow / strong southwest winds / freezing level climbing from 1600 to 2000m throughout the dayMonday: 15-20cm of snow / moderate southwest winds / freezing level lowering to 1000m throughout the day

Avalanche Summary

Widespread natural avalanche activity up to Size 3 was reported on Wednesday. Fresh storm and wind slabs, as well as deeply buried persistent slabs remain sensitive to human triggers.

Snowpack Summary

Weaknesses within and under the 60-100+cm of storm snow will need some time to settle and strengthen. Persistent weaknesses remain a concern in the many parts of the region. Buried surface hoar on sheltered treeline slopes and below and facets with associated crusts in exposed treeline and alpine areas are probably down well over a metre in most places.Basal facets remain a concern in shallow snowpack areas, especially where the snowpack is overlaying summer firn on slopes that have already produced deep persistent slab avalanches and have been reloaded.Wind-loading has resulted in highly variable slab thicknesses with the potential for fractures triggered in highly sensitive thin slab areas to propagate into highly destructive deep slab avalanches. Furthermore, weaknesses within the slab create the potential for step-down fractures.A recently buried thin hard rain crust that extends into alpine elevations is also providing a poor bond to overlying deep hard wind slabs.

Avalanche Problems

Wind Slabs

Watch for sensitive wind slabs lurking below ridgecrests, behind terrain features and in cross-loaded gullies.

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

Elevations: Alpine, Treeline.

Likelihood: Possible - Likely

Expected Size: 1 - 5

Storm Slabs

Watch for touchy storm slabs on steep unsupported terrain features.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Possible

Expected Size: 2 - 5

Persistent Slabs

More likely to be triggered from thin slab areas, from heavy triggers like cornice falls, or from storm or wind slab avalanches stepping down to deeper weaknesses.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Unlikely - Possible

Expected Size: 3 - 7