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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
3: Considerable
The avalanche danger rating at treeline will be considerable
Below Treeline
2: Moderate
The avalanche danger rating below treeline will be moderate

Regions: Banff Yoho Kootenay.

Human triggered avalanches are likely on the Oct .26 basal facets/depth hoar. Watch for wind loading Friday as this could trigger large natural avalanches.

Weather Forecast

Warmer temperatures for the next couple of days (still below freezing) and no significant snow in the forecast. SW winds may increase Thursday in the alpine which is something to look out for.

Snowpack Summary

Up to 70 cm of snow 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 October 26 basal facets and crust.

Avalanche Summary

We keep getting reports of large avalanches happening in various locations. Today we had a report of numerous size 2 - 3.5 avalanches initiating naturally in the Cirque Peak and Jimmy Simpson area along Highway 93N. They were reported to step down to the basal facets, and a localized increase in wind was the likely trigger.

Confidence

Avalanche Problems

Deep Persistent Slabs

The Oct. 26 layer is still very active. Some large natural avalanches are still occurring and human triggering is likely. This layer needs time to adjust to the load and this problem will be around for some time.
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