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Avalanche Forecast

Archived

Feb 11th, 2020–Feb 12th, 2020

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, human triggered possible.
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

South Coast Inland.

Generally favourable avalanche conditions but watch for wind slabs on steep, wind-affected slopes.

Confidence

High -

Weather Forecast

Tuesday night: Dry. Winds light northwesterly.

Wednesday: Dry with increasing cloud cover. Winds light southwesterly. Freezing level around 1100 m.

Thursday: Around 5 cm new snow. Winds moderate southwesterly. Freezing level around 1000 m.

Friday: Flurries. Winds moderate southwesterly. Freezing level around 900 m.

Avalanche Summary

A natural size 2 wind slab avalanches was reported on a north aspect at 2000 m on Sunday. A cornice-triggered wind slab was also noted on an east aspect at similar elevation.

In the neighbouring Sea to Sky region, a very large (size 3.5) avalanche occurred on Saturday near Whistler on a steep north face at 2400 m. It is suspected to have failed on a layer of facets on a crust from late November. This very large event demonstrates the ongoing need for caution in aggressive alpine terrain, particularly in areas where deep instabilities remain.

Snowpack Summary

Strong southerly winds during the storm shifted to northerly and created wind slabs on a variety of aspects. The snow surface is wind-affected at treeline and in the alpine. The recent storm snow sits on a rain crust below 1900 m.

In the north part of the region (ie. Goldbridge/Duffey/Hurley), a few deep instabilities exist in the snowpack, including a weak basal facet crust complex. There has not been recent avalanche activity on these layers but they remain a concern and are on our radar. 

The south of the region, including the Coquihalla and Manning areas, we currently have no concerns about deeply buried weak layers.

Terrain and Travel

  • Recent wind has varied in direction so watch for wind slabs on all aspects.
  • Be careful as you transition into wind affected terrain.
  • Avoid areas where the snow feels stiff and/or slabby.

Problems

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.