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Avalanche Forecast

Archived

Dec 1st, 2024–Dec 2nd, 2024

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

Regions

Glacier.

Loose Dry avalanches are running fast in steep terrain. Be prepared to manage your sluff where snow is unconsolidated in the alpine at at tree line.

There has been less wind slab development than expected but this problem remains a concern in exposed terrain.

Confidence

Moderate

Avalanche Summary

Natural Loose dry avalanches have been observed in the Park over the past two days up to size 1.5.

Rider triggered sluffing has been noted in recent MIN reports as well.

Field teams have observed wind slab development in the alpine but we have not noted any natural avalanche activity of this type recently.

Snowpack Summary

Up to 40cm of very low density snow has fallen over the past week! This new snow has buried a variety of old snow surfaces. These include: wind affected snow in higher Alpine areas, a crust on solar aspects, and settled storm snow in sheltered terrain.

The Nov 9 crust is down 50-100cm. The base of the snowpack is comprised of several dense, melt-freeze rain crusts formed in October.

Treeline snowpack depths average 110-130cm, falling to 45cm at Rogers Pass (1315m).

Weather Summary

Warming Temperature, no Precipitation

Tonight: Mainly cloudy. No precipitation. Ridge wind SW 15 km/h. Freezing level (FZL) 900 m.

Mon: A mix of sun & cloud. No precipitation. Alpine High -1 °C. Ridge wind SW 20 km/h, FZL 1500 m. Alpine temperature inversion.

Tues: Cloudy with sunny periods. No precipitation. Alpine High -2 °C. Ridge wind W 20-30. FZL 1600 m.

Wed: Cloudy with sunny periods. Ridge wind SW 20. FZL 1900 m

Terrain and Travel Advice

  • Be aware of the potential for loose avalanches in steep terrain where snow hasn't formed a slab.
  • Watch for newly formed and reactive wind slabs as you transition into wind-affected terrain.

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.