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Archived

Avalanche Forecast

Jan 21st, 2013–Jan 22nd, 2013
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
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
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
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: Northwest Coastal.

Confidence

Fair - Timing, track, or intensity of incoming weather is uncertain for the entire period

Weather Forecast

Tuesday: Moderate to strong SW wind.  Alpine temperature near -2. Light snow, starting late in the day.Wednesday: Light to moderate S wind.  Alpine temperature near -5. Moderate snow.Thursday: Increasing S winds. Alpine temperature near -5. Moderate snow.

Avalanche Summary

A snowcat triggered a size 2 slab on a cross loaded north aspect at 1400 m on Sunday. A recent natural size 1.5 avalanche was also observed on a steep SW aspect near Terrace.

Snowpack Summary

The current medley of snow surfaces includes hard and soft wind slabs, scoured slopes, blue ice and thin melt-freeze crusts. A persistent weakness of surface hoar buried at the end of December sits about 50-70cm below the surface. Recent snowpack tests gave moderate to hard, sudden results on this layer. The mid and lower snowpack is generally well settled and strong, although basal facets remain a concern in the north of the region.

Avalanche Problems

Wind Slabs

Hard and soft wind slabs may be found on many slopes, even below treeline. It may be possible to trigger a wind slab with the weight of a person or snowmobile.
Be aware of the potential for wide propagations due to the presence of hard windslabs.>Travel on ridgetops to avoid wind slabs on slopes below.>Avoid steep slopes below cornices.>

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

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1 - 4