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Avalanche Forecast

Archived

Feb 13th, 2020–Feb 14th, 2020

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

Regions

Jasper.

Relentless winds continue to build on the existing wind slabs and cornices in the Alpine. Varied surface crusts making riding challenging below 1700m.

Good turn found between 1740m and 1705m, Enjoy!

Weather Forecast

Forecasts show an intense pulse of precipitation (~10mm) accompanied with strong south westerly winds overnight Thursday. Broken skies through the day Friday, west winds continue. Alpine temperatures high, -10.

See Weather synopsis here: Avalanche Canada Mountain Weather Forecast

Snowpack Summary

Relentless SW winds continue building variable strength windslab and pronounced cornice development on Northerly aspects and cross loaded features treeline and above. Supportive mid-pack bridging the deeper basal facets and depth hoar. Average HS at treeline: ~180cm.

Avalanche Summary

Field team in Churchill Slide Paths observed only previous evidence of natural avalanche activity. Visibility was poor over then day; no new avalanche observations. Profile at 2250m, HS: 135cm. No failures found in field tests.

Confidence

Wind effect is extremely variable

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.