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Avalanche Forecast

Archived

Apr 10th, 2019–Apr 11th, 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 unlikely, human triggered possible.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.

Regions

Jasper.

Travel conditions are best in the morning. Avoid placing yourself below cornices which are weakening and present significant overhead hazard.

Weather Forecast

Diurnal temperature swing can be expected over the next 3 days. Tomorrow's winds will remain generally light with alpine highs of -3C. A mix of sun and cloud will limit the destabilizing influence of solar radiation on the snowpack. Up to 10cm of new snow is forecast for Friday.

Snowpack Summary

A supportive crust  exists to 2,100m near treeline. Higher up, at treeline and above, a winter snowpack remains on N aspects . Solar facing slopes have crusts extending higher into the alpine. At upper elevation a weak faceted layer buried down 20-50cm remains of concern. The snowpack sits on a weak base of facets and depth hoar.

Avalanche Summary

No new avalanche activity has been observed although signs of cornice failures have been  reported

Confidence

Forecast snowfall amounts are uncertain

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.