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Avalanche Forecast

Archived

Dec 28th, 2021–Dec 29th, 2021

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

Regions

Little Yoho.

Some great skiing to be had for those who brave the cold! If you go, remember to pack extra layers, choose short objectives close to the road, and be prepared to survive the cold if something goes wrong.

Weather Forecast

A generally stable weather pattern for the next 3 days. Daytime highs will be ~ -20 C and overnight lows ~ -30 C. A weak system moves through Wednesday afternoon/ overnight with increased alpine winds and a few centimetres of snow. Otherwise, clear skies, cold temperatures and light winds dominate.

Snowpack Summary

Isolated windslabs remain primarily in alpine terrain but also in isolated treeline areas. There is 70-110 cm over the Dec 2 crust/facet combo which exists below 2200m. This has not been an active problem yet but we are monitoring it closely. Shallow areas (<100 cm) may still have weak basal facets near the ground, but not prevalent in most areas

Avalanche Summary

A couple size 1 loose dry natural avalanches were observed on Tuesday in steep alpine terrain. These were primarily from steep, rocky, thin snowpack areas and likely a result of the cold temperatures facetting the snowpack. Local ski areas were able to trigger small wind slabs in lee areas in the alpine with ski cuts and explosives.

Confidence

Due to the number of field observations

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.