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Avalanche Forecast

Archived

Dec 27th, 2024–Dec 28th, 2024

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

Regions

Glacier.

The snow keeps stacking up! Continued snowfall and wind will create a reactive storm slab in the Alpine and exposed areas at treeline.

The best snow quality still exists in wind sheltered areas.

Confidence

Moderate

Avalanche Summary

Reports have been trickling in of wind effect and shooting cracks in alpine terrain.

There was a skier triggered wind slab below the Asulkan hut on thursday afternoon. The slab was 30-50cms deep and 40m wide.

The operations around us are also reporting a mix of wind slab and stormslabs as well as sluffing in steep terrain.

Snowpack Summary

Recent stormy weather has deposited a meter of new snow over the last week. Mod to strong S/SW winds formed a reactive wind slab in specific features (ridge lee areas, open cross-loaded slopes, convex rolls).

A persistent weak layer is down 90-120cm. This interface is breaking down, but consists of surface hoar in sheltered locations, and a sun crust on solar aspects. The snowpack's base is comprised of several early-season melt-freeze rain crusts

Weather Summary

Another storm will bring snow to Roger's Pass on Saturday.

Tonight Isolated flurries, trace amounts, Alp low -8°C, South winds 30 km/h, freezing level (FZL) at valley bottom.

Sat Flurries, 11cm, Alp High -6°C, SW winds 25km/h, FZL 1300m

Sun Flurries, Trace snowfall, Alp High -6°C, winds light SE, FZL 1100m.

Mon Sun/cloud/flurries, trace snow, Alp High -7°C, light wind gusting 30km/h, FZL 800m.

Terrain and Travel Advice

  • Watch for newly formed and reactive wind slabs as you transition into wind-affected terrain.
  • Wind slabs are most reactive during their formation.

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.

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.