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Avalanche Forecast

Jan 27th, 2023–Jan 28th, 2023
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
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

10-20 cm of new snow, and reverse wind loading from the north has arrived. The big drop in temperatures is on it's way.

Avoid exposing yourself to avalanche terrain, and allow the inherently weak snowpack to adjust to all these changes.

Confidence

Moderate

Avalanche Summary

Snowballing and previous loose wet activity was noted on steep west aspects near Weeping Wall.

A large avalanche (sz3) observed Thursday in the Icefields. Started in the alpine, running mid-track on deep facets, well into below treeline.

If you're out in the hills, don't forget to post to the MIN. Every bit of information helps.

Snowpack Summary

10 to 20cm of new snow overlies a melt-freeze crust up to 2000m, and moderate north winds at ridge top are redistributing the new snow in an atypical pattern. This, along with the small increments of snow and the wind slabs formed by strong SW winds over the past week, is all sitting on a generally weak and facetted snowpack. The depth of the snowpack is between 50 and 120cm, with shallow areas being especially weak.

Weather Summary

Cold, clear, and dry weather is in store for the weekend as a surface ridge of high pressure is established over the region.

Detailed weather forecasts from Avalanche Canada: https://avalanche.ca/weather/forecast

Terrain and Travel Advice

  • Avoid exposure to overhead avalanche terrain, avalanches may run surprisingly far.
  • Be especially cautious as you transition into wind affected terrain.
  • Avoid terrain traps such as gullies and cliffs where the consequence of any avalanche could be serious.

Avalanche Problems

Deep Persistent Slabs

The bottom of the snow pack is inherently weak with well developed Facets and Depth Hoar. Avalanches initiating in the upper snowpack are likely to step down to this layer and gain significant mass.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1.5 - 3

Wind Slabs

Moderate north winds at ridge top are forming new wind slabs on slopes that don't typically see wind loading. The wind slabs from previous moderate to strong SW winds are still out there, so finding wind slabs above tree line is likely.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Likely

Expected Size: 1 - 2

Loose Dry

The new low density snow will be sluffing out of steep terrain over the next day or two, especially if there is a trigger like strong direct sun.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Likely

Expected Size: 1 - 2