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Archived

Avalanche Forecast

Nov 22nd, 2011–Nov 23rd, 2011
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
3: Considerable
The avalanche danger rating at treeline will be considerable
Below Treeline
3: Considerable
The avalanche danger rating below treeline will be considerable

Regions: Glacier.

Large areas of Glacier National Park are CLOSED for avalanche control using EXPLOSIVES. Daily or annual permits are required to access winter restricted areas. Access info at Rogers Pass Discovery Centre.

Avalanche Problems

Storm Slabs

A natural avalanche cycle began this morning involving 25cm storm snow. Notably a size 3 ran to valley bottom. Temperatures have moderated and additional moderate to heavy precipitation today and Wedensday should create widespread slab conditions.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Likely

Expected Size: 1 - 3

Wind Slabs

New snow has buried widespread wind slabs that developed late last week. Most notable at mid-elevation open avalanche paths.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible - Likely

Expected Size: 1 - 2

Persistent Slabs

A surface hoar layer is buried up to 115 cm deep. It has become less sensitive to skier triggering but remains a concern. It will likely become more sensitive to triggering with additional load from forecasted precipitation.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1 - 3