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Archived

Avalanche Forecast

Jan 18th, 2019–Jan 19th, 2019
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
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
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: Little Yoho.

Basal instabilities can result in large avalanches with high consequences. Thinner snowpack areas will be more touchy and prone to avalanche. Make conservative choices.

Weather Forecast

10 cm of snow is forecast with moderate winds on Saturday. Windslabs are expected to develop.

Snowpack Summary

Basal instabilities are common in Yoho. Large facets and rounded facets are overlain by 100 to 150cm of settled snow.  Treeline depths range from 150cm to 200cm. Thinner snowpack areas in the 75-100cm range are thought to be less stable.

Avalanche Summary

No avalanches observed or reported today.

Confidence

Intensity of incoming weather systems is uncertain

Avalanche Problems

Deep Persistent Slabs

The weak facets and depth hoar just above the ground have an significant 100-140cm thick slab sitting above them. This slab has been hardened by wind effect TL and above. Activity is tapering, but human triggering is still possible and consequential.
Be aware of the potential for full depth avalanches due to deeply buried weak layers.Be aware of the potential for wide propagations which could result in large avalanches.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Possible

Expected Size: 2 - 3.5

Wind Slabs

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

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1 - 2