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Archived

Avalanche Forecast

Feb 12th, 2018–Feb 13th, 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
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
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=100092Recent winds have formed large fragile cornices. Minimize your exposure to these large triggers that may wake the persistent weak layers.

Weather Forecast

Sunny with cloudy periods, light ridgetop winds and an Alpine high of -11C. 

Snowpack Summary

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. Persistent weak layers are now buried 150-200cm in the snowpack. Snow depth of 325cm at treeline. Surface sun crust can be expected on steeper solar aspects.

Avalanche Summary

No new natural or skier triggered avalanches observed or reported yesterday.

Confidence

Due to the number of field observations

Avalanche Problems

Wind Slabs

Recent mod to strong N'ly winds followed by strong S'ly winds have formed winds slab in the alpine and exposed treeline locations. These winds have also contributed to large cornice development. The windslab may be susceptible to human triggering.
Use caution in lee areas. Recent wind loading have created wind slabs.If triggered the wind slabs may step down to deeper layers resulting in large avalanches.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1.5 - 2.5

Persistent Slabs

Back into lower probability but high consequence of a large avalanche if triggered with the PWL. Large loads such as wind slab or cornice fall may trigger these layers. Resulting avalanches will be large and may reach the end of their run-out zones.
If triggered the 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: Possible

Expected Size: 2 - 3.5