Avalanche Forecast
Mar 11th, 2012–Mar 12th, 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
3:
Considerable
The avalanche danger rating below treeline will be considerable
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
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: Banff Yoho Kootenay.
Up to 20cm of new snow and strong wind is expected by Tues morning, adding more load to an already debilitated snowpack. Given the fragility of the Feb 14 layer, expect to see large and destructive avalanches running far and fast.
Weather Forecast
Snowpack Summary
Avalanche Summary
Confidence
Intensity of incoming weather systems is uncertain on Tuesday
Avalanche Problems
Persistent Slabs
A slab overlies the Valentine surface hoar down 60-100 cm. Natural activity with this layer is subsiding, however, it is still prime for human triggering. In test pits today, the layer was prominent and producing results in the moderate range.
Aspects: All aspects.
Elevations: All elevations.
Likelihood: Likely
Expected Size: 2 - 4
Deep Persistent Slabs
Slabs starting on the Feb 14 layer can step down, triggering deep slabs. When triggered, these large and destructive avalanches will slide on basal facets close to the ground. Fracture lines could be up to 200cm deep with wide propagations.
Aspects: All aspects.
Elevations: Alpine, Treeline.
Likelihood: Possible
Expected Size: 2 - 4