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Archived

Avalanche Forecast

Jan 17th, 2019–Jan 18th, 2019
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
1: Low
The avalanche danger rating below treeline will be low
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
1: Low
The avalanche danger rating below treeline will be low
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
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

A weak system will track through the forecast region starting Thursday night, bringing up to 15cm of snow by the end of Saturday. Temperatures will remain on the warm side of seasonal. Alpine winds will increase late friday to the strong range from the SW.

Snowpack Summary

Solar crusts on some steep SE to West slopes at TL. Surface hoar development below treeline. It has become increasingly hard to find midpack instabilities in Yoho. Basal instabilities are common - not quite depth hoar, just large facets and rounded facets. Treeline depths range from 150cm to 200cm.

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 wide propagations which could result in large avalanches.Be aware of the potential for full depth avalanches due to deeply buried weak layers.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Possible

Expected Size: 2 - 3.5