Avalanche Forecast

Archived

Jan 8th, 2025–Jan 9th, 2025

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

Kananaskis, Bow Valley, Highwood Pass, North 40, Spray - KLakes.

Some wind slabs exist in the alpine. Good skiing can be found in sheltered areas at tree line and above.

Confidence

High

Avalanche Summary

No new avalanches have been reported.

Snowpack Summary

The surface snow has faceted and is providing good skiing. The winds in the last 36hours have created some wind slab development in isolated areas such as cross loaded gullies and the lee sides of mountain passes. The snowpack varies a lot. Thicker areas at tree line and above with close to 100cm of snow have a much denser snowpack while most areas below tree line have 40-50cm and consist mostly of facets(sugar snow).

The weak basal facets are still a concern and have a potential to be triggered from thin snowpack areas which are still plentiful at this time.

Weather Summary

Thursday will bring mostly cloudy skies with the odd sunny break and maybe 1 cm of snow. The high temperature in the alpine will climb to -8c and the winds are expected to be in the 25-40km/hr from the NW near ridgetop.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

Be mindful that deep instabilities are still present in the snowpack.
Carefully evaluate steep lines for wind slabs.
Wind slabs are isolated, but may remain reactive.

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.