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Archived

Avalanche Forecast

Jan 27th, 2012–Jan 30th, 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
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.

Lots of uncertainty, but some weather forecasts indicate moderate snowfall late Saturday and Sunday AM. Accumulations of 15 to 20 cms possible. Extreme westerly winds also likely, elevating avalanche danger over the weekend. LP snowpack 145 cm.

Avalanche Problems

Storm Slabs

Continuing light storm snow has been hammered by strong westerly winds. Surface slabs to 25cms or thicker have formed on north and easterly facing slopes and other lee terrain features. Expect deeper slabs and touchier conditions in the alpine

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

Elevations: All elevations.

Likelihood: Possible

Expected Size: 1 - 2

Persistent Slabs

Previously deposited slabs on north and easterly facing terrain are sitting on a variety of potentially weak crystals and hard crusts. Cornice failures or other larger loads may trigger a deeper release in these layers.

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

Elevations: Alpine, Treeline.

Likelihood: Unlikely - Possible

Expected Size: 1 - 3