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Archived

Avalanche Forecast

Mar 14th, 2012–Mar 17th, 2012
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
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

Regions: Waterton Lakes.

Recent storm snow of 40 cm being redistributed by moderate to strong SE winds Wed. Further significant precip. and wind expected Wed through Fri with considerable warming Thursday. These factors are expected increase the hazard: exercise caution.

Avalanche Problems

Wind Slabs

With recent wind and snow slabs have begun to develop. This growth will continue with more of the same in the forecast. These slabs are forming above the previous hard slabs and crusts in open areas well into the trees.

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

Elevations: Alpine, Treeline.

Likelihood: Possible - Likely

Expected Size: 1 - 3

Storm Slabs

40 cm of recent snow since Sunday. Expect this to develop into a soft slab as loading continues, especially with warming expected Thursday. The previous warm and windy weather has created firm crusts and hard windslabs that will act as a bed surface.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Possible

Expected Size: 1 - 2

Persistent Slabs

Isolated pockets of Surface Hoar found in protected areas. With the recent rapid loading and expected warming, the potential for this to produce serious avalanches lingers. Consider the potential for this layer to be triggered by smaller events.

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

Elevations: All elevations.

Likelihood: Unlikely - Possible

Expected Size: 2 - 4