Archived

Avalanche Forecast

Jan 12th, 2012–Jan 13th, 2012

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

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

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 Problems

Wind Slabs

Little change overnight. Strong south winds from the previous storm have left wind slabs generally found to the lee of alpine ridges and on cross loaded features at upper elevations. Wide propagation is possible.

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

Elevations: Alpine.

Likelihood: Possible

Expected Size: 2 - 3

Storm Slabs

A freezing rain crust down 50 - 60cm more prevalent west of Rogers Pass summit, shows signs of strengthening but is still a concern for skier triggering. Avalanches in this layer could trigger the surface hoar layers buried in December.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 2 - 3

Persistent Slabs

The Dec. 11 SH layer may produce avalanches when heavily loaded. Cornice failure is a current concern. Step down failures possible.

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

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 2 - 4