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Archived

Avalanche Forecast

Jan 8th, 2020–Jan 9th, 2020
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
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: Banff Yoho Kootenay.

Dangerous avalanche conditions exist in alpine a tree-line locations. Conservative route choices are required.

Weather Forecast

An arctic high pressure forms over Alberta on Thursday bring cooler temperatures, and only minor flurries. Winds will diminish as the high pressure develops. Day time highs at treeline only rising to the mid minus teens. Cooler temps will persist through the weekend.

Snowpack Summary

20-40 cm of snow, and strong wind from last few days have formed fresh wind and storm slabs. At tree line, new snow sits on pockets of surface hoar in sheltered areas and sun crust on steep solar aspects. Generally, a settled mid-pack sits over a weaker lower snowpack consisting of facets, depth hoar and crusts.

Avalanche Summary

Fresh wind slabs (both natural and skier cut) up to size1.5 in the alpine reported throughout the area today.

Confidence

Avalanche Problems

Storm Slabs

Recent storm snow and mod to strong winds have created storm and wind slabs in alpine and treeline elevations. It will take several days for these instabilities to settle out.

  • Use caution in lee areas. Recent wind loading have created storm slabs.
  • If triggered the storm slabs may step down to deeper layers resulting in large avalanches.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Likely

Expected Size: 1 - 2.5

Deep Persistent Slabs

The potential for deeper releases on the basal layers still exist. If this occurs avalanches will be large and will run to valley bottoms.

  • Avoid shallow snowpack areas where triggering is more likely.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Possible

Expected Size: 2 - 3.5