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Archived

Avalanche Forecast

Jan 4th, 2012–Jan 5th, 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: Glacier.

10cm new at Fidelity, -2 to-6, winds S 25. Very mild temperatures, high freezing levels, the possibility of rain at lower elevations and slabbing of new snow at treeline and in the alpine means that conservative route selection should be used today

Avalanche Problems

Persistent Slabs

10-15cm of snow is forecasted for later today, with high freezing levels (into the alpine) has the potential to overload the Dec. 11 persistent weak surface hoar layer. Natural and human triggered avalanches on this layer can be expected today.

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

Elevations: Alpine, Treeline.

Likelihood: Likely

Expected Size: 2 - 4

Wind Slabs

Isolated wind slabs at ridge tops are continuing to form, causing whumphing and cracking in shallow and cross-loaded areas. Failure of these slabs could step down to the deeper buried surface hoar layers which are likely to propagate widely.

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

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1 - 3

Deep Persistent Slabs

In the high alpine basal weaknesses exist and may cause large or very large avalanches. These may slide from large triggers or during periods of heavy storm loading. Large glide cracks failing near ground are also a significant concern this year.

Aspects: North, North East, East.

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 3 - 4