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Archived

Avalanche Forecast

Feb 11th, 2018–Feb 12th, 2018
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
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
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

Regions: Glacier.

http://www.pc.gc.ca/apps/scond/cond_e.asp?oid=30728&opark=100092Human triggered avalanches are still likely.

Weather Forecast

Sunny with cloudy periods today along with light ridge winds and alpine temperatures a chilly -17C. Monday expect cloudy with sunny periods and no precipitation. Tuesday a pulse of moisture is forecast to bring us ~10cm of snow and a little warmer temperatures.

Snowpack Summary

Approximately 60cm of snow from the past storm has settled into a widespread storm slab. Strong winds in the alpine have created variable wind slab in the alpine and in exposed areas at treeline. Dec and Jan persistent weak layers are now buried 150-200cm in the snowpack. Height of snow is 350cm at treeline.

Avalanche Summary

Numerous natural and artillery controlled avalanches to sz 4.0 occurred during Thursday's storm. Several ran full extent, taking out mature trees. Friday avalanche control just west of the park produced more large destructive size 4 avalanches. While natural activity has tapered off, human triggered avalanches are likely given the right location.

Confidence

Intensity of incoming weather systems is uncertain on Tuesday

Avalanche Problems

Storm Slabs

The last storm brought 60cm+ of snow. In the alpine, strong winds have formed windslab. If triggered these slabs have potential to propagate. Cornices have grown in size & become more fragile in the last week, avoid exposing yourself to this hazard.
If triggered the storm/wind slabs may step down to deeper layers resulting in large avalanches.Carefully evaluate terrain features by digging and testing on adjacent, safe slopes.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Likely

Expected Size: 1.5 - 3

Persistent Slabs

Deeply buried persistent weak layers were reactive in the recent avalanche cycle. Larger loads such as storm slab or cornice fall may trigger these layers. Resulting avalanches will have the potential to reach the full extent of their run-out zones.
Be aware of the potential for wide propagations.Use conservative route selection, choose moderate angled and supported terrain with low consequence.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Possible

Expected Size: 2.5 - 4