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Archived

Avalanche Forecast

Dec 28th, 2011–Dec 29th, 2011
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
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
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

Regions: Glacier.

Avalanche control operations will be commencing in Glacier Park this morning, and will likely continue for much of the day. Large avalanches are expected due to heavy loading of storm snow over multiple weak layers.

Avalanche Problems

Storm Slabs

A significant storm with 30cm of new snow, high South winds (40-70kph), and warm temps (-3 at 2000m) has resulted in a widespread avalanche concern throughout the park. Storm snow could propagate widely on the Dec. 24 surface hoar layer, down 60cm.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Likely - Very Likely

Expected Size: 2 - 3

Persistent Slabs

The Dec. 11 surface hoar layer now down 110-150cm, is expected to become more reactive today from being overloaded by heavy storm snow. Dec. 24 Surface Hoar (down 60cm) will contribute to wide propagations. Expect touchy conditions today.

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

Elevations: Alpine, Treeline.

Likelihood: Unlikely - Possible

Expected Size: 2 - 4

Deep Persistent Slabs

A weak basal crust is present in the alpine and was responsible for large avalanches. The deep layers are generally unreactive but may be triggered from thin snowpack areas. Glide cracks are forming at all elevations. One failed at 1100m Dec 22.

Aspects: All aspects.

Elevations: Alpine.

Likelihood: Unlikely

Expected Size: 3 - 4