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Avalanche Forecast

Archived

Mar 10th, 2016–Mar 11th, 2016

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

Regions

Little Yoho.

Avalanche Control Planned for Mt. Bosworth, Stephen, Dennis, and Field on Friday. Please no recreational activities in these zones.

Weather Forecast

Snowfall tapers off Thursday night. Cloudy with sunny periods with freezing levels to 1700m for Friday. Scattered flurries are forecasted for Saturday.

Snowpack Summary

20 to 35 cm of new snow sits on a well settled mid and lower pack. This new snow overlies a temperature crust below 1800m on polar aspects and a sun crust into the alpine on solar aspects. Isolated wind effect exists near ridge-tops. No significant shears found in the mid and lower pack, however thin snowpack areas are still suspect.

Avalanche Summary

Poor visibility on Thursday and no new avalanches reported. Last Monday there was a skier triggered avalanche on the Wapta near Mt. Collie and the Richard and Louise Guy Hut. It was a size 2.5 on a SE aspect at 2600m. It failed on a facet layer near the base of the snowpack and took two skiers for a ride, partially burying one with minor injuries.

Confidence

Problems

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.

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.