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Archived

Avalanche Forecast

Mar 14th, 2012–Mar 15th, 2012
Alpine
4: High
The avalanche danger rating in the alpine will be high
Treeline
4: High
The avalanche danger rating at treeline will be high
Below Treeline
3: Considerable
The avalanche danger rating below treeline will be considerable
Alpine
4: High
The avalanche danger rating in the alpine will be high
Treeline
4: High
The avalanche danger rating at treeline will be high
Below Treeline
3: Considerable
The avalanche danger rating below treeline will be considerable
Alpine
4: High
The avalanche danger rating in the alpine will be high
Treeline
4: High
The avalanche danger rating at treeline will be high
Below Treeline
4: High
The avalanche danger rating below treeline will be high

Regions: Glacier.

Avalanches are running full path, and on a scale larger than has been seen for many years. Even if you are below treeline, you could be exposed to large avalanches from above, or smaller avalanches in open glades.

Avalanche Problems

Storm Slabs

More snow in the past 24 hours with high gusty winds and warm temperatures have created storm slabs at all elevations. These are reactive to skier triggering.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Likely - Very Likely

Expected Size: 2 - 3

Persistent Slabs

The Feb 9 surface hoar, sun crust, facet layer is now down 1.5 to 2 meters, and remains very reactive. The very mild temperatures and high winds have overloaded this layer yet again. Large avalanches have run to valley bottom and across valleys.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Likely - Very Likely

Expected Size: 3 - 4

Wind Slabs

Southerly winds are transporting snow, loading slopes and forming windslabs on exposed slopes at treeline and above. Large avalanches occurred this weekend on lee slopes. These windslabs overlie lower density snow and may be triggered by skiers.

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

Elevations: Alpine, Treeline.

Likelihood: Likely

Expected Size: 2 - 3