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Avalanche Forecast

Archived

Feb 17th, 2019–Feb 18th, 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.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.

Regions

Jasper.

Terrain is both the problem and the solution to this facetted, deep persistent problem. Manage your exposure and keep wary to evidence of localized instability; like cracking, whumphing and, recent nearby avalanche activity.

Weather Forecast

A cool NE flow of dry arctic air over the day Monday and into the week. No significant changes to the current weather expected. Monday: Sunny with cloudy periods. No precipitation. High -11 C. Light ridge wind west. Tuesday: Cloudy with sunny periods and isolated flurries.A detailed mountain weather forecast is available from Avalanche Canada.

Snowpack Summary

Cold temps have faceted the upper snowpack leaving a weak slab over a faint instability down 40cm (surface hoar/facets on a crust). Look for areas where a strong mid-pack will support a rider over the deep persistent weakness. A shallower mid-pack will act as a slab if triggered, sliding on facets and depth hoar in the lower third of the snowpack.

Avalanche Summary

Field team in Whistler Creek Saturday reporting good ski conditions and no new avalanches in the region. Numerous dry loose to sz 1; characteristically from steeper, planar terrain; widespread across the forecast region.

Confidence

Problems

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.