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Avalanche Forecast

Archived

Feb 25th, 2017–Feb 26th, 2017

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

Regions

Little Yoho.

Still good ski quality despite increasing wind effect in the alpine. Move cautiously into bigger terrain features as we have limited observations from the region, and the weak layers are not yet well defined.

Weather Forecast

Cloudy skies with light North winds and flurries producing small amounts of snow are forecast for Sunday. Cooler temperatures in the -18 to -20C range are expected in the alpine.

Snowpack Summary

50-60cm of snow sits over a layer of facets and surface hoar formed mid Jan at treeline and below producing moderate sudden planar results. In the alpine a layer of facets can be found down 80-100cm with a stiff snowpack above and below. Deeper snowpack areas closer to the Wapta have a more settled snowpack with fewer weaknesses.

Avalanche Summary

No new avalanche activity noted or reported on Saturday. Signs of the previous widespread avalanche cycle were evident on Mt. Field up to size 2.5 on Friday.

Confidence

Due to the number of field observations

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.

Loose Dry

Loose Dry avalanches are the release of dry unconsolidated snow and typically occur within layers of soft snow near the surface of the snowpack. These avalanches start at a point and entrain snow as they move downhill, forming a fan-shaped avalanche. Other names for loose-dry avalanches include point-release avalanches or sluffs.