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Archived

Avalanche Forecast

Dec 19th, 2024–Dec 20th, 2024
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
Treeline
3: Considerable
The avalanche danger rating at treeline will be considerable
Below Treeline
2: Moderate
The avalanche danger rating below treeline will be moderate
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
Treeline
3: Considerable
The avalanche danger rating at treeline will be considerable
Below Treeline
2: Moderate
The avalanche danger rating below treeline will be moderate
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
Treeline
3: Considerable
The avalanche danger rating at treeline will be considerable
Below Treeline
2: Moderate
The avalanche danger rating below treeline will be moderate

Regions: Glacier.

A significant storm brought 40cms of new snow and strong winds, which is a perfect recipe for slab development.

Cautious route-finding and conservative decision-making is essential

Confidence

Moderate

Avalanche Summary

Avalanche control at Rogers Pass on Wednesday produced storm slab avalanches to size 3.

Several natural avalanches were observed in the highway corridor during the last storm. Naturals ran up to size 3 with some running running full feature.

Snowpack Summary

40cm of new snow has fallen with strong gusting Southerly winds. This lands on variable wind slabs already present in the Alpine and at Treeline. A persistent weak layer is down 50-70cm. This interface consists of surface hoar in sheltered locations, a sun crust on solar aspects, and continues to produce moderate-hard sudden results in test profiles. The snowpack's base is comprised of several early-season melt-freeze rain crusts.

Weather Summary

A pacific frontal system approaches BC and brings light snow to the Selkirks.

Tonight: 11cm, Alp low -4°C, Mod-Strong SW wind, Freezing level (FZL) 1500m

Fri: Trace precip, Alp High -1°C, Strong SW wind, FZL 1800m

Sat: 4cm. Alp High 0°C, Strong SW winds, FZL 1900m

Sun: Trace precip, Alp high -4°C, Moderate SW wind, FZL 1500m.

Terrain and Travel Advice

  • Storm slabs in motion may step down to deeper layers resulting in large avalanches.
  • Look for signs of instability: whumphing, hollow sounds, shooting cracks, and recent avalanches.

Avalanche Problems

Storm Slabs

In the last 24-48 hours there has been 30-50cms of new snow, accompanied by strong/extreme S & West winds. A reactive, cohesive storm slab will form with these conditions and will be easily triggered by riders.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Likely - Very Likely

Expected Size: 1.5 - 3

Persistent Slabs

60-80cm of snow overlays a layer of surface hoar in sheltered zones, and a sun crust on steep, solar aspects. There has been limited activity on this layer in recent days, but the new load from the incoming storm could re-awaken this problem.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1 - 3