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Archived

Avalanche Forecast

Apr 6th, 2012–Apr 9th, 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
2: Moderate
The avalanche danger rating at treeline will be moderate
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.

Full winter in the alpine. Hard crusts all aspects to the top of treeline. This is still a winter snowpack. Heating will break down the crusts and elevate hazard. Secure travel over these crusts will be a concern and timing with the heating is key.

Avalanche Problems

Wind Slabs

Obvious slabs have developed in open lee areas at higher elevations. Avoid large or planar slopes where these slabs may be more continuous. Feel for harder slabs now hidden by recent storm snow and be cautious with slabs formed over crusts.

Aspects: North, North East, East.

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1 - 3

Cornices

Large and fragile cornices formed last week with warm moist conditions and strong wind transport. These will be prone to natural failure on windy periods or during warming trends. Carefully consider your route choice while traveling on ridges.

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

Elevations: Alpine.

Likelihood: Unlikely - Possible

Expected Size: 1 - 2

Loose Wet

The upper snowpack is now a series of crusts with weak moist snow in between. Consider crampons and ice axe for safe travel on steep slopes. Be wary of heating that will break down these crusts especially on solar aspects allowing for larger events.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible - Likely

Expected Size: 1 - 3