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Avalanche Forecast

Archived

Dec 5th, 2021–Dec 6th, 2021

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

Regions

Jasper.

As natural activity is fizzling out, triggering lingering wind slabs or the November crust at the bottom of the snowpack is still possible.

Keep your MIN reports coming as your eyes on the ground are appreciated.

Weather Forecast

Monday: A mix of sun and cloud. No Precip. Alpine temp: High -14 °C. Wind west: 10 km/h. FL at valley bottom.

Tuesday: Cloudy with sunny periods and isolated flurries.Trace. Alpine tem: High -8 °C. Wind southwest: 15-25 km/h. Wednesday: Flurries. Accumulation: 8 cm. Alpine teme: High -6 °C. Wind west: 25 km/h gusting to 65 km/h. FL at valley bottom.

Snowpack Summary

Light to moderate SW winds blew the storm snow into wind slabs or stripped windward features to ground. The midpack is supportive and the crust /facet /depth hoar combo near the ground is the only layer of concern.

Avalanche Summary

Maligne area field team reported no new avalanches on Sunday. No other new avalanches reported.

Confidence

The weather pattern is stable

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.