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Avalanche Forecast

Archived

Dec 6th, 2024–Dec 7th, 2024

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

A significant storm will bring heavy snowfall and strong winds over the weekend. This new snow falls on a weak layer of surface hoar, widespread avalanche activity is expected.

If you do come to Roger's Pass stick to simple terrain with no overhead hazard.

Confidence

High

Avalanche Summary

Wet loose avalanches have been running this last week from steep south and west facing slopes. Without solar input these will likely not be a significant problem this weekend.

Snowpack Summary

Surface hoar exists 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 40-50cms of new snow through the weekend with strong winds.

Tonight: Snow, 22cms. Alp low -4°C, SW winds 30 km/hr, 1100m Freezing Level (FZL).

Sat: Snow, 18cm, Alp high -4°C, SW winds, 25km/hr gusting to 45km/hr, 1400m FZL

Sun: Cloudy with flurries, Alp high -6°C, Mod SW winds. FZL 1100m

Mon: Flurries, 10cm, Alp high -10°C, Moderate SW winds, 700m FZL.

Terrain and Travel Advice

  • Avoid avalanche terrain during periods of heavy snowfall.
  • Make conservative terrain choices and avoid overhead hazard.

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.