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Avalanche Forecast

Archived

Dec 15th, 2019–Dec 16th, 2019

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

Regions

Little Yoho.

Basal facets, crusts and depth hoar are found in many places. Use caution if you're heading into committing terrain, as it's a bit of a gamble whether you will trigger a slope, these layers are hard to predict.

Weather Forecast

A gradual increase in wind values beginning Sunday afternoon will result in sustain strong winds at upper elevations. Wi will likely see an increase in cloud cover Monday and light precipitation by Tuesday. A slight warming trend will begin early Monday with valley bottom temperatures climbing to the negative single digits.

Snowpack Summary

Pockets of wind slab linger in alpine areas. Beneath the recent 40-60cm of storm snow, the snowpack structure is generally weak, consisting of facets and depth hoar. The Nov crust is present up to 2500m and ~30 cm up from ground. In areas with a deeper snowpack (Tak Falls, Stanley Mitchell, Ogden, etc.) the basal weakness is less pronounced.

Avalanche Summary

No new natural avalanche activity observed or reported Sunday.

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.

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.