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Avalanche Forecast

Archived

Feb 9th, 2013–Feb 10th, 2013

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

Regions

Jasper.

Public reports indicate some good skiing can be found where recent snow is sitting on the previous hardslab in sheltered locations in the alpine.

Weather Forecast

No significant precipitation is expected in the next 3 days. Temps expected to be mild and skies partly cloudy.  Freezing levels to remain below 1300m.

Snowpack Summary

Hard windslab is bridging the weak basal facets above treeline.  Below treeline the mid-pack is weak and shallow. Scattered flurries over the past 48 hours have left a dusting of new snow in the Icefield area and up to 10cm in the Maligne area.

Avalanche Summary

No avalanches were observed on a road patrol of the Icefields Parkway and Maligne Valley.

Confidence

Due to the number of field observations

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.