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Avalanche Forecast

Archived

Dec 30th, 2016–Dec 31st, 2016

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

Regions

Little Yoho.

Watch for slab formation as you enter open areas. All lee areas near ridge crests should be considered suspect and conditions may change across a slope.

Weather Forecast

Light flurries forecasted saturday with a downward trend in temperatures starting saturday evening as another arctic flow arrives. Were expecting clear sky's and temperatures of -15 to -25 over the next few days.

Snowpack Summary

At 1850 m. 40 cm of settled storm snow sits on the Dec 19 layer of facets and produces moderate (PC) compression test results. Another profile at 2100 m. showed no shears in the snowpack. At the higher elevations, strong winds over the past week have created widespread wind slabs which will be easily triggered by people.

Avalanche Summary

Little avalanche activity was observed today. Lake Louise ski resort reported some natural activity releasing from recently developed windslabs in the alpine to sz 1.5.

Confidence

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.