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Archived

Avalanche Forecast

Feb 17th, 2012–Feb 18th, 2012
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
1: Low
The avalanche danger rating at treeline will be low
Below Treeline
1: Low
The avalanche danger rating below treeline will be low
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
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: Glacier.

More sunshine today. A weak system will move in tomorrow bringing 5 to 15cm snow and rising south winds. A touchy surface (see problem 2) will become very reactive as load increases. Danger ratings will be higher than forecast if we get more snow.

Avalanche Problems

Wind Slabs

SW winds have formed thin wind slabs. Skiers have triggered these slabs, creating avalanches to size 2. They are touchiest where present on a suncrust or surface hoar. These windslabs can be high consequence if over a cliff or terrain trap.

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

Elevations: Alpine.

Likelihood: Possible

Expected Size: 1 - 3

Loose Dry

The top 20cm consists of low density snow, preserving surface hoar layers, and sitting on facets. On solar aspects, add a crust to that mix. On steep slopes, this surface will be triggered by skiers, and sluffs may build enough mass to push you over.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Possible - Likely

Expected Size: 1 - 2

Cornices

Cornices are large, and can fail unpredictably. As temperatures fluctuate from cold overnight to warm during the day cornices may weaken further. Use caution while travelling along and below ridges, giving cornices lots of room.

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

Elevations: Alpine.

Likelihood: Unlikely - Possible

Expected Size: 1 - 2