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Archived

Avalanche Forecast

Mar 25th, 2017–Mar 26th, 2017
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: Jasper.

Avoid all big avalanche terrain that hasn't recently run.  The deep persistent slab is easily triggered from weak spots resulting in large full path avalanches.

Weather Forecast

Continued cool temps into next week with light flurries and SW winds.  Cloudy skies with sun expected on Tuesday. 

Snowpack Summary

The main concern in the snowpack at tree-line and above is the deep persistent slab over weak facet layer at ground. This slab can be triggered by travelers from shallow or weak locations or naturally from large loads such as cornice failure or windslab avalanches. All steep loaded slopes that have not recently avalanched should be avoided.

Avalanche Summary

A size 3 skier accidental slab avalanche was reported Saturday afternoon north of the Icefields on a NE aspect at tree-line. The avalanche was triggered from below as group worked their way through the trees. It was triggered from a whumph and propagated wide and ran to ground. One member was partially buried with no injuries.

Confidence

Due to the number and quality of field observations on Sunday

Avalanche Problems

Deep Persistent Slabs

The deep persistent slab can be triggered by travelers from shallow or weak locations or naturally from large loads such as cornice failure or windslab avalanches.  On Mar 25, skiers triggered a sz 3 on this layer.
Avoid exposure to overhead avalanche terrain, large avalanches may reach the end of run out zones.Avoid paths that have not avalanched recently.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Likely

Expected Size: 2 - 4

Wind Slabs

Windslabs exist at treeline and above on lee aspects. No recent natural activity has been observed however human triggering is possible.
If triggered the wind slabs may step down to deeper layers resulting in large avalanches.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Likely

Expected Size: 2 - 3

Cornices

Large cornices on ridge top lee features.  Recent cornice failure has triggered large avalanches from alpine terrain.
Pay attention to overhead hazards like cornices which could easily trigger the deep persistent slab.Give cornices a wide berth when travelling on or below ridges.

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

Elevations: Alpine.

Likelihood: Possible - Likely

Expected Size: 1 - 3