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Avalanche Forecast

Archived

Mar 21st, 2024–Mar 22nd, 2024

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.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.

Regions

Northwest Coastal, Boundary, Kitimat, Nass, Rupert, Seven Sisters, Shames, Stewart, Howson, Ningunsaw, Ningunsaw, Ningunsaw.

A gradual cooling and overnight recovery should decrease the likelihood of avalanches.

Uncertainty remains on how quickly the persistent slabs will gain strength.

Confidence

Moderate

Avalanche Summary

On Wednesday, a few persistent slab avalanches (up to size 3) were observed on alpine south-facing slopes, probably triggered by daytime warming. Skier-triggered avalanches (size 2) also occurred in shallow rocky areas where the upper slab stepped down to the persistent slab. Small natural wet avalanches were also reported from steep solar slopes. Debris from the past widespread avalanche cycle are still visible throughout the region.

Snowpack Summary

A widespread melt-freeze crust exists on the surface in most areas. The frozen surface may soften throughout the day at lower elevations and south-facing slopes. Dry powder snow can still exist on true north-facing alpine slopes. A weak layer of surface hoar is developing in sheltered terrain at treeline and above. At lower elevations, snowpack was isothermal over the last few days.

Various weak layers, including crusts, facets, and/or surface hoar exist approximately 90 and 180 cm below the surface.

Weather Summary

Thursday Night

Clear with cloudy periods. 10 to 20 km/h southeast ridegtop wind. Treeline temperature -5 °C. Freezing level lowering to valley bottom.

Friday

Sunny. 20 to 30 km/h southeast ridgetop wind. Treeline temperature -4 °C. Freezing level rising to 1200 m. Overnight refreeze expected.

Saturday

Sunny. 30 to 50 km/h northeast ridgetop wind. Treeline temperature -4 °C. Freezing level rising to 1200 m. Overnight refreeze expected.

Sunday

Sunny. 20 to 30 km/h southeast ridgetop wind. Treeline temperature -1 °C. Freezing level rising to 1800 m. Overnight refreeze expected.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • When a thick, melt-freeze surface crust is present, avalanche activity is unlikely.
  • Keep in mind that human triggering potential persists as natural avalanching tapers off.
  • A moist or wet snow surface, pinwheeling and natural avalanches are all indicators of a weakening snowpack.

Problems

Persistent Slabs

Persistent Slab avalanches are the release of a cohesive layer of snow (a slab) in the middle to upper snowpack, when the bond to an underlying persistent weak layer breaks. Persistent layers include: surface hoar, depth hoar, near-surface facets, or faceted snow. Persistent weak layers can continue to produce avalanches for days, weeks or even months, making them especially dangerous and tricky. As additional snow and wind events build a thicker slab on top of the persistent weak layer, this avalanche problem may develop into a Deep Persistent Slab.