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Archived

Avalanche Forecast

Jan 5th, 2012–Jan 6th, 2012
Alpine
4: High
The avalanche danger rating in the alpine will be high
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
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

Regions: Glacier.

Avalanche control is occurring today. Grizzly is the only permit area open. Large avalanches overnight (to size 3.5) have run to the end of the run out zones and into creeks. Extreme winds (S 145) and wet precipitation has created unstable slabs.

Avalanche Problems

Storm Slabs

A rain crust that formed on Jan 3 is buried by 30cm of moist storm snow. Very high South winds (40-145 kph) and mild temps (+1C) have created a storm slab over this crust, which is now very reactive, producing large avalanches to valley bottom.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Likely

Expected Size: 2 - 4

Persistent Slabs

The Dec. 11 SH layer is still evident in the snowpack. Although becoming less reactive, large triggers such as cornice failures and avalanches are stepping down to this weakness. Recent avalanche activity has stepped down to this layer overnight.

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

Elevations: Alpine, Treeline.

Likelihood: Possible - Likely

Expected Size: 2 - 4

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