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Archived

Avalanche Forecast

Dec 20th, 2013–Dec 21st, 2013
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
1: Low
The avalanche danger rating below treeline will be low
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
1: Low
The avalanche danger rating below treeline will be low
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
1: Low
The avalanche danger rating below treeline will be low

Regions: Banff Yoho Kootenay.

Even though the cool temps have tightened the snowpack, the potential to trigger full depth avalanches remains due to the weak base that will be a problem for some time to come. JBW

Weather Forecast

Cool northwesterly flow with some weak disturbances will continue for the next few days bring little snowfall but cold breezy conditions. Temps warm slightly by Sunday.

Snowpack Summary

Some moderate wind transport is adding to the slabs at treeline and above. This will increase the propagation potential across the start zone features. The weak base with depth hoar and the October melt freeze crust will mean any avalanche will involve the entire snowpack.

Avalanche Summary

No new avalanches were observed today, but we suspect a few more slabs pulling out on steep lee features with the additional loading. Avalanches to size three both natural and explosive triggered have occurred over the last few days some running full path.

Confidence

Avalanche Problems

Wind Slabs

Use caution in lee areas in the alpine. Recent wind loading have created wind slabs.The new snow will require several days to settle and stabilize.

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

Elevations: Alpine, Treeline.

Likelihood: Likely

Expected Size: 1 - 3

Deep Persistent Slabs

Be aware of the potential for full depth avalanches due to weak layers at the base of the snowpack.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Likely

Expected Size: 2 - 4