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Archived

Avalanche Forecast

Jan 2nd, 2012–Jan 3rd, 2012
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
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: Kootenay Boundary.

Confidence

Good - -1

Weather Forecast

Tuesday: A couple centimetres possible overnight with up to 5-10cm possible throughout the day. Freezing levels could reach as high as 2000m in the evening with a temperature inversion, and moderate southwesterly alpine winds are expected. Wednesday: Continued light snowfall with moderate to strong southwesterly winds, and freezing levels around 1300m. Thursday: Generally dry with isolated flurries possible.

Avalanche Summary

Reports of avalanches are getting less frequent, but human triggering large avalanches associated with persistent weaknesses remains possible, including remote triggering. A skier recently remotely triggered an avalanche from 50m away and in many places shooting cracks and whumphing are further indicators of a very touchy, unstable snowpack.

Snowpack Summary

Compression tests have been producing easy to moderate sudden results on the mid-December surface hoar, down 30-80cm, and propagation tests have shown that avalanches associated with this persistent slab have a high propensity to propagate over large areas. above the mid-december weak layer of surface hoar. A storm snow weakness down 30cm also gave easy sudden results, recently formed wind slabs remain touchy, and in some places buried wind slabs are a concern.

Avalanche Problems

Persistent Slabs

Touchy weakness susceptible to human triggering. Particularly a concern on unsupported slopes.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Possible - Likely

Expected Size: 3 - 5

Wind Slabs

Be alert for wind slabs below ridge crests, behind terrain features, and in cross-loaded gullies. New cornices may be weakly bonded and likely to break off.

Aspects: North, North East, East, South East, South, South West.

Elevations: Alpine, Treeline.

Likelihood: Possible - Likely

Expected Size: 1 - 5