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Avalanche Forecast

Archived

Jan 6th, 2022–Jan 7th, 2022

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

Regions

Jasper.

Great riding in sheltered locations.

Flurries not enough to refresh your favourite line this weekend but, the cold temps have likely faceted the tracks!

Be cautious near overhead features, avalanches can run far on the Dec crust, TL and below.

Weather Forecast

Friday: Cloudy with sunny periods and isolated flurries. Trace. Temp: High -8 °C. Wind W:15-35 km/h.

Saturday: Cloudy with sunny periods and isolated flurries. Trace. Temp: Low -22 °C, High -14 °C. Wind west: 20 km/h gusting to 55 km/h.

Sunday: Mainly cloudy with isolated flurries. Trace. Temp: Low -13 °C, High -8 °C. Wind west: 20-30 km/h.

Snowpack Summary

Cold temperatures continue to promote faceting. Continued wind slabs building in deposition zones. The mid-pack is supportive with a questionable interface down close to 40cm, which has questionable reactivity below 1900m. Basal faceting continues near or on the ground.

Avalanche Summary

No new avalanches observed or reported today, poor afternoon visibility. 

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.

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.