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Avalanche Forecast

Archived

Jan 18th, 2020–Jan 19th, 2020

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

Regions

Jasper.

As we exit the deep freeze we can expect to see an increase in natural activity. Caution with exposure to over head terrain as sluffs can run far and fast.

Weather Forecast

Temperatures will continue to warm over the next few days. Winds will become westerly and increase to Strong values by Monday evening.

Sunday: 7cm of snow expected by evening with Freezing levels at Valley bottom. High -6

Monday: Trace amounts of snow High -6 Freezing levels rising to 1500M

For more info: Avalanche Canada Mountain Weather Forecast

Snowpack Summary

Continued faceting of snowpack. Up to 15cm of new light dry snow is not bonding well to the upper settled pack. This overlies a weakening mid-pack comprised of varied facet forms. This provides some questionable bridging over the basal facets and DH. HS average at TL: ~145cm.

Avalanche Summary

An ice dagger collapse off of the ice climb Curtain Call produced a size 1.5 failing on ground.

Confidence

Problems

Loose Dry

Loose Dry avalanches are the release of dry unconsolidated snow and typically occur within layers of soft snow near the surface of the snowpack. These avalanches start at a point and entrain snow as they move downhill, forming a fan-shaped avalanche. Other names for loose-dry avalanches include point-release avalanches or sluffs.

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.