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Archived

Avalanche Forecast

Feb 6th, 2016–Feb 7th, 2016
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
Treeline
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
2: Moderate
The avalanche danger rating below treeline will be moderate
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
2: Moderate
The avalanche danger rating at treeline will be moderate
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: Kootenay Boundary.

Treeline hazard may be higher near Rossland where buried surface hoar has been more reactive.

Confidence

Moderate - Freezing levels are uncertain

Weather Forecast

No significant snow or wind in the forecast. The big news is BIG warm up on Tuesday with a temperature inversion and freezing levels possibly rising to near 3000m near Kootenay Pass and 2000m further north in region.

Avalanche Summary

A skier triggered size 1.5 persistent slab avalanche was reported in the Rossland area on Friday. It was at 1700m on an east aspect and failed on a layer of buried surface hoar down approximately 35cm in a cut block.

Snowpack Summary

15-20cm of recent storm snow with moderate to strong southwest winds have created wind slabs that are stubborn, but still possible to human trigger. In isolated locations where winds were the strongest there may be hard slabs that can propagate long distances if triggered. This new snow lies above a variable old surface buried at the end of January. This interface is being reported as a layer of surface hoar at treeline in the Rossland area. However, in most other parts of the region the new snow sits on a rain crust and/or old wind slabs. A weak layer of buried mid January can be found down 45-50cm and seems to be gaining strength. Deeper in the snowpack, the surface hoar layer that was buried earlier in January is now down 80-120 cm and continues to give isolated sudden planar fractures in snowpack tests under heavy loads.

Avalanche Problems

Wind Slabs

Day time warming may increase sensitivity of stubborn wind slabs.
Be cautious as you transition into wind affected terrain.>Use ridges or ribs to avoid pockets of wind loaded snow.>

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

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1 - 3

Persistent Slabs

This layer has been more reactive near Rossland.
Dig down to find and test weak layers before committing to a big line. >Be aware of the potential for large avalanches due to the presence of buried surface hoar. >

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Unlikely - Possible

Expected Size: 3 - 5