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Avalanche Forecast

Archived

Nov 22nd, 2013–Nov 23rd, 2013

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

Regions

Glacier.

Various reports of buried surface hoar at higher elevations and the evidence of large avalanches means potentially large consequences if this layer is triggered.

Weather Forecast

The interior will be under more of a north west flow but the high pressure system still remains over the province leaving us with no significant precipitation for the foreseeable future. Temperatures are forecast to rise through the weekend.

Snowpack Summary

Last week's storm snow is settling. The November 12th surface hoar layer is buried between 60 and 120cm. Its distribution is valley dependant. It had been observed up to 2500m on Mt Abbott in the Asulkan Valley possibly explaining the occurrence of large avalanches to size 3.5 running off the Dome.

Avalanche Summary

No new avalanches.

Confidence

Due to the number of field observations on Friday

Problems

Persistent Slabs

Persistent Slab avalanches are the release of a cohesive layer of snow (a slab) in the middle to upper snowpack, when the bond to an underlying persistent weak layer breaks. Persistent layers include: surface hoar, depth hoar, near-surface facets, or faceted snow. Persistent weak layers can continue to produce avalanches for days, weeks or even months, making them especially dangerous and tricky. As additional snow and wind events build a thicker slab on top of the persistent weak layer, this avalanche problem may develop into a Deep Persistent Slab.

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.