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Avalanche Forecast

Archived

Apr 7th, 2022–Apr 8th, 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 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.
Below Treeline
Natural avalanches unlikely.

Regions

Kootenay Boundary.

Continually assess the snow surface and watch for natural avalanche activity as you move through terrain. There is uncertainty in how the snowpack will respond to the rapidly changing freezing levels.

Confidence

Low - Uncertainty is due to difficult to forecast freezing levels.

Weather Forecast

Thursday night: No new snow expected. Moderate to strong southwest winds. Possibility of temperature inversion with above freezing layer in the alpine.

Friday: Stormy with up to 10 cm of new snow at higher elevations and rain below. Moderate to strong southwest winds and freezing levels around 2000 m during the day and falling to 1500 m in the evening.

Saturday: Mostly cloudy with light flurries bringing trace amounts of snow. Light to moderate west winds and freezing levels around 1200 m.

Sunday: A mix of sun and cloud with flurries bringing up to 5 cm of new snow. Light west winds and freezing levels around 1200 m.

Avalanche Summary

Over the past few days storm and wind slab avalanches up to size 1.5 were triggered on all aspects at treeline. Triggers included ski cuts, vehicle and skier remotes and explosives. Several small natural cornice falls were also observed.

On Wednesday several size 1.5 wet loose avalanches were observed on solar aspects. We suspect wet slab and wet loose avalanches will be observed throughout the region on all aspects on Thursday and Friday.

Snowpack Summary

Moist or wet snow will be observed on all aspects and elevations. AS the freezing level falls during the day on Friday a new thick and supportive crust will form.

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

Terrain and Travel

  • Back off slopes as the surface becomes moist or wet with rising temperatures.
  • Keep in mind that wet avalanches can be destructive due to their high density.
  • Watch for newly formed and reactive wind slabs as you transition into wind affected terrain.

Problems

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.