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Avalanche Forecast

Archived

Dec 7th, 2020–Dec 8th, 2020

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

Regions

Glacier.

Danger ratings are increasing today with the incoming storm. Weather models are uncertain, but if heavy snow and winds develop during the day, danger levels will rise rapidly.

If it starts dumping, make conservative choices.

Weather Forecast

A storm front will make its way across BC today, bringing snow later this afternoon and through tomorrow.

Today: Flurries beginning near noon, 8cm. FZL 1400m. Wind SW-35km/h

Tonight/Tuesday: Snow, 20cm. FZL 1400m. Wind SW 35 km/h gusting to 60 km/h

Wed: Cloudy with scattered flurries, FZL 1000m, light W winds

Snowpack Summary

A surface crust on steep solar aspects is currently being buried by the incoming storm. Dry powder sits on shaded aspects. At TL and below, surface hoar exists on the surface to sz 8.0mm, with buried layers down 10cm (size 5-7mm) and down 40cm (size 3mm). The Nov 5th crust is prominent, widespread up to 2500m, and sits under more than 1m of snow.

Avalanche Summary

No new avalanches observed in the highway corridor nor in the backcountry.

Confidence

Timing, track, or intensity of incoming weather system is uncertain

Problems

Storm Slabs

Storm Slab avalanches are the release of a cohesive layer (a slab) of new snow that breaks within new snow or on the old snow surface. Storm-slabs typically last between a few hours and few days (following snowfall). Storm-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.