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Avalanche Forecast

Archived

Apr 5th, 2022–Apr 6th, 2022

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

Regions

Kootenay Boundary.

Keep an eye on the snow surface, as it becomes moist from solar input the size and likelihood of avalanches will increase.

Confidence

Moderate - We are confident the likelihood of avalanche will increase with the arrival of the forecast weather.

Weather Forecast

Tuesday night: Flurries bringing trace amounts of new snow. Light west winds and a low of -7 at 1500 m.

Wednesday: Sunny with no new snow expected. Light westerly wind and freezing levels rising to 1800 m.

Thursday: Sunny with no new snow expected. Moderate southwest winds and freezing levels rising to 2300 m.

Friday: Stormy with up to 5 cm of new snow in the alpine and rain below. Moderate to strong southwest winds and freezing levels around 2200 m.

Avalanche Summary

On Monday storm slab avalanches up to size 1.5 were triggered on all aspects at treeline. Triggers included ski cuts, vehicle remotes and explosives. Several small natural cornice falls were also observed.

Snowpack Summary

Up to 30 cm of recent storm snow has formed slabs at treeline and above. Below this new snow a crust exists on all aspects and elevations. Moist snow will be observed at lower elevations and on all sun exposed slopes as the freezing level rises and the sun comes out.

Multiple crusts exist in the upper snowpack. The mid and lower snowpack are well settled.

Terrain and Travel

  • Watch for newly formed and reactive wind slabs as you transition into wind affected terrain.
  • Avoid sun exposed slopes, especially if snow surface is moist or wet.
  • Keep in mind that wet avalanches can be destructive due to their high density.

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.

Wet Slabs

Wet Slab avalanches are the release of a cohesive layer of snow (a slab) that is generally moist or wet when the flow of liquid water weakens the bond between the slab and the surface below (snow or ground). They often occur during prolonged warming events and/or rain-on-snow events. Wet Slabs can be very unpredictable and destructive.