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Avalanche Forecast

Archived

Dec 3rd, 2024–Dec 4th, 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, human triggered possible.
Below Treeline
Natural avalanches unlikely.

Regions

Glacier.

An inversion in the region will bring warm temps to the Alpine. A blanket of valley cloud will give the appearance of a grey day, but the sun will be shining strong on Southerly aspects.

Warming temps may trigger loose, wet sluffs from steep S-facing terrain, as well as increase the reactivity of wind slabs.

Confidence

Moderate

Avalanche Summary

Sluffing in steep terrain has been reported by multiple parties in MIN reports over the past few days.

No new natural avalanche activity reported over the past 3 days.

Snowpack Summary

Surface hoar adorns the snowpack at Treeline elevations and up. Below this, 20-40cm of low density snow sits on various old surfaces, including: wind affect in exposed Alpine terrain; 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

An inversion brings WARM air aloft with valley cloud keeping it grey down below.

Tonight: Cloudy, Alp low 1°C, mod W winds, 1300m Freezing Level (FZL)

Wed: Sun and cloud, Alp high 2°C, light SW winds, 2000m FZL

Thurs: Sun and cloud, Alp high 1°C, light SW winds,1500m FZL.

Fri: Flurries, 10cm, Alp high -3°C, light SW winds,1500m FZL.

Terrain and Travel Advice

  • Avoid steep, sun-exposed slopes when the air temperature is warm or when solar radiation is strong.
  • Wind slabs are isolated, but may remain reactive.

Problems

Loose Wet

Loose Wet avalanches are the release of wet unconsolidated snow or slush. These avalanches typically occur within layers of wet snow near the surface of the snowpack, but they may quickly gouge into lower snowpack layers. Like Loose Dry Avalanches, they start at a point and entrain snow as they move downhill, forming a fan-shaped avalanche. Other names for loose-wet avalanches include point-release avalanches or sluffs. Loose Wet avalanches can trigger slab avalanches that break into deeper snow layers.

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.