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Avalanche Forecast

Archived

Dec 5th, 2024–Dec 6th, 2024

Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural and human triggered avalanches likely.
Treeline
Natural and human triggered avalanches likely.
Below Treeline
Natural avalanches possible, human triggered probable.
Alpine
Natural avalanches possible, human triggered probable.
Treeline
Natural avalanches possible, human triggered probable.
Below Treeline
Natural avalanches possible, human triggered probable.

Regions

Glacier.

An incoming storm Friday afternoon will bring heavy snowfall and strong winds. This new snow falls on a weak layer of surface hoar.

Avalanche hazard will increase rapidly when the snow starts.

Confidence

Moderate

Avalanche Summary

Loose avalanches have been observed this week. Dry loose avalanches/sluffing has been rider triggered in steep terrain with powder snow.

Wet loose avalanches have been solar triggered above the valley cloud in steep terrain facing the sun.

Snowpack Summary

Surface hoar is growing on the surface and will be the layer to watch when it gets buried! Steep South & West facing slopes have a sun crust at treeline and alpine elevations.

There is a dense well settled midpack without any significant weak layers.

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

Treeline snowpack depths approx. 120 cm, with 40 cm at Rogers Pass (1315m).

Weather Summary

An incoming storm Friday afternoon will bring 40cms through the weekend.

Tonight: Cloudy, Precip nil. Alp low -2°C, light SW winds, 700m Freezing Level (FZL). Alp temp inversion.

Fri: Flurries, 10cm, Alp high -2°C, Moderate SW winds,1500m FZL.

Sat: Snow, 20-30cm, Alp high -2°C, Mod SW winds, gusting to 65km/hr, 1500m FZL

Sun: Cloudy with flurries, Alp high -6°C, Mod SW winds.

Terrain and Travel Advice

  • Be alert to changing conditions throughout the day.

Problems

Storm Slabs

Storm Slab avalanches are the release of a cohesive layer (a slab) of new snow that breaks within new snow or on the old snow surface. Storm-slabs typically last between a few hours and few days (following snowfall). Storm-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.