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Archived

Avalanche Forecast

Jan 9th, 2019–Jan 10th, 2019
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
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
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
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
2: Moderate
The avalanche danger rating below treeline will be moderate

Regions: Little Yoho.

The main problem in Little Yoho is the Dec.10 persistent layer, but watch for thin areas which may step down to basal facet layers much like East of the divide.

Weather Forecast

Warmer temperatures (still below freezing) for Friday with no significant snow in the forecast. There may be some increased alpine winds tomorrow which should be watched for as this could increase the chances of natural avalanches.

Snowpack Summary

Up to 70 cm of recent snow with variable wind effect has put a dense load over the persistent weak layers. In thicker snow pack areas, the Dec. 10th weak layer of facets is now down 100-150cm with a stronger snowpack below. In thin snowpack areas, the Dec.10th layer is mixed in with the basal facets and October crust.

Avalanche Summary

There have been reports every day in the last while of large avalanches in the backcountry. A report today of numerous size 2.5-3 avalanches triggered likely by wind on Hwy 93N. These failed on the deep persistent basal Oct. 26 layer. This layer is less of a problem in Little Yoho but shows the fickle nature of the snowpack right now.

Confidence

Avalanche Problems

Persistent Slabs

The Dec.10 layer of facets and some surface hoar are down 150+cm at treeline. There have been few observations from this deeper snowpack region as to the sensitivity of this layer, but recent avalanche control has seen deep propagations.
Be aware of the potential for wide propagations which could result in large avalanches.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Likely

Expected Size: 2 - 3.5