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Avalanche Forecast

Archived

Feb 24th, 2017–Feb 25th, 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.

Great supportive ski quality with little wind effect into the alpine. Move cautiously into bigger terrain features as we have limited observations from the region, and the weak layers not well defined as of yet. SH

Weather Forecast

Highs of -15 at both 2000m and 3000m with light gusting moderate winds and trace amounts of snow later in the afternoon.  Sunday and Monday look cooler with alpine temperatures around -20C and continued light winds.

Snowpack Summary

At TL and below 50-60cm of snow lies over a layer of facets and surface hoar formed mid Jan., producing moderate sudden planar results today on Mount Field. Below lies a mainly faceted snowpack. In the alpine a layer of facets can be found down 80-100cm with a stiff snowpack above and below. Areas closer to the Wapta have a more settled snowpack.

Avalanche Summary

No new avalanche activity noted today, but signs of a previous avalanche cycle were evident on Mt. Field to size 2.5.

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.