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Avalanche Forecast

Archived

Mar 18th, 2021–Mar 19th, 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, human triggered possible.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.

Regions

Kootenay Boundary.

New wind slabs may form over Friday at higher elevations.

Confidence

High -

Weather Forecast

A weak cold front will bring light amounts of snow and cooler temperatures on Friday.

THURSDAY NIGHT: 5-10 cm of snow with freezing level dropping from 2200 m to 1500 m, 30-50 km/h southwest wind.

FRIDAY: Scattered flurries with up to 5 cm of snow, 30-40 km/h southwest wind, treeline temperatures drop to -4 C and freezing level around 1500 m.

SATURDAY: Mix of sun and cloud, 20-30 km/h southwest wind, treeline temperatures around -5 C.

SUNDAY: Mostly cloudy, 20 km/h southwest wind, treeline temperatures around -5 C.

Avalanche Summary

No new avalanches were observed on Wednesday or Thursday, with the exception of small loose wet avalanches in steep sun-exposed terrain in the afternoon. In the coming days the main concern will be new snow forming isolated wind slabs.

Snowpack Summary

A weak cold front will bring 5-10 cm of new snow that may form new wind slabs at high elevations in lee terrain features. The new snow will overly a widespread melt-freeze crust, with the exception of northerly aspects at high elevations where some surface hoar has formed. Cornices are large and always have the potential of failing, particularly during daytime warming.

Deeper in the snowpack, a persistent weak layer from late January is buried around 80 to 150 cm and is composed of a combination of surface hoar, facets, and crusts. We haven't received a report of avalanche activity on this layer since late February and the likelihood of triggering this layer is currently low.

As always, best to avoid shallow, rocky areas where a weak and faceted snowpack may be found.

Terrain and Travel

  • Carefully evaluate steep lines for wind slabs.
  • When a thick, melt-freeze surface crust is present, avalanche activity is unlikely.

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.