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Avalanche Forecast

Archived

Feb 17th, 2024–Feb 18th, 2024

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, 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

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

Use caution in sheltered areas where buried surface hoar or crust layers may exist.Additionally, avalanches may be triggered near ridgetops where wind-affected snow accumulates.

Confidence

Moderate

Avalanche Summary

Several natural, rider and explosive-triggered avalanches occurred over the last week.Most were small (size 1-1.5) with a few larger ones up to size 2.5. They occurred at treeline or above and on a variety of aspects. All were either wind slabs or persistent slabs failing on the weak layers described in the snowpack summary.

While natural avalanche activity is expected to taper off, the chance of rider-triggered avalanches is expected to persist into the following week.

Snowpack Summary

All exposed terrain at treeline and above is highly wind affected by recent strong winds from variable directions.

In sheltered terrain a new layer of surface hoar is forming on the surface and a new sun crust may be found on steep south and west-facing slopes.

A layer of surface hoar and/or facets may be found buried 20-30 cm in sheltered terrain.

A crust from late January can be found down 20-50 cm.

Weather Summary

Saturday Night

Mostly cloudy, no precipitation, 15-20 km/h southeast alpine wind, treeline temperature -5°C. Chance of above freezing layer between the Prince Rupert to Kitimat to Terrace areas.

Sunday

A mix of sun and cloud, trace amounts of snow. 5-10 km/h westerly alpine wind, treeline temperature 1°C between Prince Rupert, Kitimat and Terrace areas where above freezing layer may exist. Freezing level 500m elsewhere in the region.

Monday

Cloudy north of the Nass Valley, mostly sunny to the south, trace amounts of snow, 10-25 km/h northwest alpine wind. Treeline temperature 0°C in the south, -3°C to the north, freezing level 500-1000 m.

Tuesday

A mix of sun and clouds, no precipitation, 15-20 km/h northwesterly alpine wind, treeline temperature 1°C in the south, -5°C to the north. Freezing level 500-1000 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Remote triggering is a concern, watch out for adjacent and overhead slopes.
  • Recent wind has varied in direction so watch for wind slabs on all aspects.
  • Keep in mind that human triggering potential persists as natural avalanching tapers off.

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.

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.