Archived

Avalanche Forecast

Nov 25th, 2011–Nov 28th, 2011

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

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: Waterton Lakes.

Good early-season snowpack, but surface slab avalanche danger and deeper potential releases on buried ice crusts are a concern. Conservative route selection is recommended this weekend.

Avalanche Problems

Wind Slabs

The midweek storm brought 40-50cms of mostly heavier moist snow to the area. Cooler snow deposited more recently has been affected by strong westerly winds, creating potential for surface slabs over this heavier midpack.

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

Elevations: All elevations.

Likelihood: Possible

Expected Size: 1 - 2

Deep Persistent Slabs

A couple of mid-sized slab avalanches occurred from steep northeasterly bowls during the storm this week. Basal ice crusts and weak layers near the ground are the main concern, and may be overloaded by continuing light snowfall and strong winds.

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

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 2 - 4