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Avalanche Forecast

Archived

Feb 21st, 2014–Feb 22nd, 2014

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

Regions

Jasper.

Human triggered avalanches remain possible on specific slopes such as steep convex shaped wind-loaded features. Skiing is good alpine to treeline locations where sheltered from the wind.

Weather Forecast

A dusting of snow Friday into Saturday with light North winds on Saturday and cold overnight temperatures. Sunday into Wednesday will be sun and cold overnight temperatures with daytime warming in the afternoons. 

Snowpack Summary

There is about 30cm overtop a facet and decomposing surface hoar layer from the previous cold weather. This seems to be most prevalent from treeline into the lower alpine elevations. Below tree line there is a supportive yet shallow mid-pack over facets. Alpine has a variety of layers in top 1m but generally all well bridged.

Avalanche Summary

No new natural avalanches were observed or reported.

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.