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Avalanche Forecast

Archived

Mar 24th, 2021–Mar 25th, 2021

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

Kootenay Boundary.

Wind slabs at upper elevations are the main concern. The best quality snow will be up high on north aspects.

Confidence

Moderate - Uncertainty is due to the timing or intensity of solar radiation and its effect on the snowpack.

Weather Forecast

WEDNESDAY NIGHT: Cloudy with flurries and 1-3 cm of new snow, light northwest wind, treeline temperatures around -4 C, freezing level 1100 m.

THURSDAY: Mix of sun and cloud with isolated flurries bringing 1 to 3 cm of new snow, light northwest wind, treeline temperatures around -3 C, freezing level 1500 m.

FRIDAY: Clear skies with afternoon cloud, light west wind, treeline temperatures around -1 C, freezing level 1900 m.

SATURDAY: Clear skies, light southwest wind, treeline temperature 0 C, freezing level 2000 m.

Avalanche Summary

Many small to large wind slabs were triggered naturally, by explosives, and by riders on Tuesday. They generally occurred at treeline and alpine elevations and were 10 to 30 cm deep, within the recent storm snow.

Looking forward, storm slab activity is expected to rapidly decline but wind slabs could still be triggered at higher elevations. Keep your eye out for the sun, as sun-exposed slopes could rapidly deteriorate if the sun pokes through the clouds.

Snowpack Summary

Around 5 to 10 cm of snow accumulated on Tuesday, which overlies a melt-freeze crust on southerly aspects, perhaps small surface hoar crystals on shaded aspects, and otherwise 20 cm of snow from the weekend. This recent snow has generally been stabilizing, but there could be some wind slabs that linger at higher elevations. All of this recent snow sits above a widespread crust, with the exception of high north-facing terrain. A persistent weak layer from late January is buried 80 to 150 cm deep, but is unlikely to trigger as the last reported avalanche on this layer was in late February.

Terrain and Travel

  • Be careful with wind slabs, especially in steep, unsupported and/or convex terrain features.
  • Be alert to conditions that change with elevation and sun exposure.
  • Back off if you encounter whumpfing, hollow sounds, or shooting cracks.

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.