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Avalanche Forecast

Archived

Apr 16th, 2019–Apr 17th, 2019

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

Regions

Jasper.

The pockets of windslab in the alpine could be triggered by the weight of a skier, expect them to be most reactive where they sit on a crust.

Weather Forecast

On Wednesday a warm front will pass over us, followed by a costal low with precipitation and strong winds on Thursday-Friday.

Wednesday: Cloudy with sunny periods and isolated flurries. Treeline temperature: Low -5, High -3 C. Ridge Light (gusting strong) from the West. Freezing level: 2000 metres.

Snowpack Summary

Above treeline 10cm of settling snow sits on a variety of crusts. Above 2200m on Northerly slopes, a more winter like snowpack can be found, with pockets of windslab, a peristent weak layer down 20-50cm and a facetted mid and lower snowpack which is weak in shallow areas.

Avalanche Summary

There was isolated natural windslab activity observed during last weekends wind/snow event. The mid march PWL continues to produce whumphing in shallower snowpack areas and on moraine features, indicating unstable snow below.

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.