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Avalanche Forecast

Archived

Nov 23rd, 2021–Nov 24th, 2021

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 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.

After a brief lull in the the weather on Wednesday, strong winds and precipitation will return on Thursday increasing the avalanche hazard.

Weather Forecast

Tonight: Clear periods.

Alpine temperature: Low -13 C.

Ridge wind west: 10-30 km/h.

Wednesday: Cloudy with sunny periods and isolated flurries.

Precipitation: Trace.

Alpine temperature: High -11 C.

Ridge wind southwest: 20-40 km/h.

Thursday: Flurries.

Accumulation: 8 cm.

Alpine temperature: Low -12 C, High -7 C.

Ridge wind southwest: 20 km/h.

Snowpack Summary

Previous strong SW winds stripped all aspects in the alpine. New snow with warm temperatures and moderate winds have likely create new wind slabs. Above freezing temperature to 2000m will likely result in a future crust. A 1-2cm thick crust 80cm down is found up to 2500m. Below this crust are more crusts or facets depending on elevation.

Avalanche Summary

No new avalanches were observed on Monday.

Confidence

Due to the number and quality 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.

Deep Persistent Slabs

Deep Persistent Slab avalanches are the release of a thick cohesive layer of hard snow (a slab), when the bond breaks between the slab and an underlying persistent weak layer deep in the snowpack. The most common persistent weak layers involved in deep, persistent slabs are depth hoar or facets surrounding a deeply buried crust. Deep Persistent Slabs are typically hard to trigger, are very destructive and dangerous due to the large mass of snow involved, and can persist for months once developed. They are often triggered from areas where the snow is shallow and weak, and are particularly difficult to forecast for and manage.