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Archived

Avalanche Forecast

Apr 10th, 2012–Apr 13th, 2012
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
4: High
The avalanche danger rating in the alpine will be high
Treeline
4: High
The avalanche danger rating at treeline will be high
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.

Freezing levels are forecast to remain at mtn top until Wed night. This means that stability will deteriorate early on Wed especially on solar aspects. Winter will return on Thurs with 15cm of snow in the alpine, natural avalanches should be expected

Avalanche Problems

Loose Wet

Overnight freezing has created solid crusts at lower elev but in the alpine the upper snowpack is still a series of crusts. Freezing levels should remain above 3000m for Wed night meaning poorer stability in the morning, decreasing with solar warming

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

Elevations: All elevations.

Likelihood: Possible - Likely

Expected Size: 1 - 2

Cornices

Large and fragile cornices now loom over most north and east aspects. These will be prone to natural failure during warming trends. Carefully consider your route choice while traveling on ridges and pay attention to what is above you.

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

Elevations: Alpine.

Likelihood: Possible

Expected Size: 1 - 3

Persistent Slabs

They crust that was buried on March 26 is now down around 50cm. Avalanches that start in surface layers could step down to this interface, especially at higher elevations where the surface crusts are not as thick.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1 - 3