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Archived

Avalanche Forecast

Jan 8th, 2012–Jan 9th, 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
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
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
2: Moderate
The avalanche danger rating below treeline will be moderate

Regions: Glacier.

Forecast snowfall amounts did not materialize overnight. 5 cm new at Fidelity. Moderate precipitation amounts and rising freezing levels are forecast today and Monday, so danger ratings will remain in the considerable range.

Avalanche Problems

Storm Slabs

30 cm of storm snow overlies rain crust. This storm slab has gained strength but heavy loads may trigger a large avalanche. Stability tests show moderate failures on faceted snow below the crust.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Possible

Expected Size: 2 - 3

Persistent Slabs

The Dec. 11 SH layer continues to produce avalanches when heavily loaded such as during or after periods of snowfall or wind. A fracture line profile at 1600m showed this slab failing 110 cm deep during the last storm on Jan 6.

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

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 2 - 4

Wind Slabs

Strong south winds from the most recent storm transported snow produced soft slabs over the Jan 3 rain crust or the storm slabs formed earlier last week. The crust carries into the lower alpine in some locations. Watch the immediate lee of ridges.

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

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1 - 3