Archived

Avalanche Forecast

Nov 22nd, 2011–Nov 25th, 2011

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

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

2: Moderate

The avalanche danger rating at treeline will be moderate

Below Treeline

2: Moderate

The avalanche danger rating below treeline will be moderate

Regions: Waterton Lakes.

Danger rating has risen with the moist system that has hit the area. Accumulation could be 30 to 40 cm by the end of the storm. This could overload the shallow early season snowpack with weak layers at the base.

Avalanche Problems

Storm Slabs

The weak layers at that base of the snow pack are getting over loaded with moist, dense and heavy snow. Another 15 to 20 cm are forecast for the next 48 hours. Slab avalanches are likely, especially where the basal crust is prevalent, above 1900m.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Possible

Expected Size: 1 - 3

Wind Slabs

Strong southwest winds have redistributed the storm snow from the weekend. These slabs are sitting on weak layers at the base of the snowpack. They will become more touchy as the slab thickens with the strong winds and new snow.

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

Elevations: Alpine, Treeline.

Likelihood: Unlikely - Possible

Expected Size: 1 - 3