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Avalanche Forecast

Archived

Apr 14th, 2019–Apr 15th, 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.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches unlikely.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.

Regions

Jasper.

Weather Forecast

A trough strengthens offshore in the Aleutians on Monday morning. This will push cool and unsettled air over our region. Monday: A mix of sun and cloud with isolated flurries. Precipitation: Trace. Treeline temperature: Low -9 °C, High -4 °C.Ridge wind: light West. Freezing level: 1700 metres.

Snowpack Summary

Light snowfall and moderate SW wind building pockets of slab in the alpine. A supportive crust exists to 2,100m on all aspects and extends into the alpine on solar slopes. A winter snowpack remains on N alpine aspects, with a weak faceted layer down 20-50cm remaining a concern, and a facetted mid/lower snowpack that is weak in shallow areas.

Avalanche Summary

No new avalanche activity has been observed or reported.

Confidence

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.