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Avalanche Forecast

Archived

Nov 21st, 2012–Nov 22nd, 2012

Alpine
Natural avalanches possible, human triggered probable.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely, human triggered possible.
Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches possible, human triggered probable.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely.

Regions

Glacier.

The winter permit system is not yet in effect but is scheduled to come into effect on Friday, November 23rd.  Click here to for information on how to obtain annual and daily winter permits.

Weather Forecast

Unstable convective snow showers today, possibility of rain below 1100m, moderate to strong SW winds at times.  Drier and cooler tomorrow, freezing levels lowering to surface. 

Snowpack Summary

Now over 80mm of load on the Nov 6 crust, down 60-80cm from the surface. Sudden planar results are being reported on this layer in the Asulkan Drainage recently. A storm slab is reactive where it overlies the Nov 16 sun crust which can be found in the upper snow pack on steep southerly aspects.

Avalanche Summary

Several new avalanche events to size 3 where observed yesterday above the highway corridor on running to 3/4 fan.

Confidence

Due to the number and quality of field observations

Problems

Storm Slabs

Storm Slab avalanches are the release of a cohesive layer (a slab) of new snow that breaks within new snow or on the old snow surface. Storm-slabs typically last between a few hours and few days (following snowfall). Storm-slabs that form over a persistent weak layer (surface hoar, depth hoar, or near-surface facets) may be termed Persistent Slabs or may develop into Persistent Slabs.

Wind Slabs

Wind Slab avalanches are the release of a cohesive layer of snow (a slab) formed by the wind. Wind typically transports snow from the upwind sides of terrain features and deposits snow on the downwind side. Wind slabs are often smooth and rounded and sometimes sound hollow, and can range from soft to hard. Wind slabs that form over a persistent weak layer (surface hoar, depth hoar, or near-surface facets) may be termed Persistent Slabs or may develop into Persistent Slabs.