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Archived

Avalanche Forecast

Apr 11th, 2012–Apr 12th, 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
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
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
Treeline
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
3: Considerable
The avalanche danger rating below treeline will be considerable

Regions: Glacier.

Daytime warming is the biggest concern today. The snowpack can change from mostly stable to very unstable rapidly at this time of year. Watch for cornices, glide cracks, and small avalanches that could trigger larger ones.

Avalanche Problems

Loose Wet

Loose avalanches are likely as the day warms up in steep terrain facing the sun. Warm temps up to 9 C and little overnight freezing means it will take very little warming today to cause avalanches. Use extra caution below rock outcrops and trees.

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

Elevations: All elevations.

Likelihood: Very Likely

Expected Size: 1 - 3

Wet Slabs

The storm snow from last week has settled into a cohesive slab above the March 27 crust. Slabs failures on this layer were observed yesterday on south aspects above and below tree line. Loose moist avalanches today are likely to trigger this layer.

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

Elevations: All elevations.

Likelihood: Likely

Expected Size: 2 - 3

Deep Persistent Slabs

The Feb 8th layer is a concern again as large moist avalanches dig to deeper layers. Cornice fall and large glide crack releases are more likely under rapid warming conditions.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Unlikely

Expected Size: 2 - 4