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Avalanche Forecast

Archived

Mar 22nd, 2021–Mar 23rd, 2021

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

Regions

Kootenay Boundary.

Good riding can be found on north-facing slopes, but watch for wind slabs in steep open terrain.

Confidence

High -

Weather Forecast

MONDAY NIGHT: Clearing skies, 30-40 km/h north wind, treeline temperatures drop to -7 C.

TUESDAY: Sunny, light northwest wind, treeline temperatures around -5 C.

WEDNESDAY: Cloudy with light flurries and up to 5 cm of new snow, 30-40 km/h southwest wind, treeline temperatures around -5 C.

THURSDAY: Mix of sun and cloud, light northwest wind, treeline temperatures around -3 C.

Avalanche Summary

Preliminary reports from Monday suggest the new snow formed some thin reactive slabs, with a few size 1.5 natural avalanches reported. Otherwise avalanche activity over the past week has been limited to small dry loose sluffs and small wet loose avalanches on sun-exposed slopes.

Snowpack Summary

Flurries over the past few days delivered 15-30 cm of snow. This snow has generally been stable, but there could still be some wind slabs at higher elevations. This 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.