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Archived

Avalanche Forecast

Dec 31st, 2011–Jan 1st, 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
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

Regions: Sea To Sky.

Confidence

Fair - Freezing levels are uncertainfor the entire period

Weather Forecast

Sunday: 5-7cm of snow / strong south winds / Freezing levels between 1000-1800mMonday: 8-12 cm of snow / strong south winds / Freezing levels between 1000-1800m.Tuesday: light snowfall / moderate southwest winds / Freezing levels at 1000m.

Avalanche Summary

Numerous Size 1-2 slab avalanches (both natural and human triggered) have been reported in the past 2 days.

Snowpack Summary

The total snowfall in the past week has amounted to 100-180cm. Weaknesses exist within, and at the base of, the storm snow. New and old wind slabs have formed in exposed NW-E facing slopes, 1m deep in some areas. Cornices have grown large and could act as a trigger for large avalanches. A weak rain crust is found below the new snow up to treeline elevations. This crust may sit on top of buried surface hoar and/or facets. A strong mid pack overlies basal facets that have also gained considerable strength. On average the snowpack is around 200cm deep near treeline.

Avalanche Problems

Wind Slabs

Deep and dense wind slabs exist below ridge crests, behind terrain features and in cross-loaded gullies. New wind slabs will form with forecast weather.

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

Elevations: Alpine, Treeline.

Likelihood: Likely

Expected Size: 1 - 3

Storm Slabs

Weaknesses within and at the base of the storm snow may be triggered naturally by the weight of a person/sled. Storm slabs could fail on deep persistent weaknesses.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Possible

Expected Size: 1 - 5