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Avalanche Forecast

Archived

Jan 22nd, 2025–Jan 23rd, 2025

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

Regions

North Columbia, South Columbia, Blue River, Premier, Clemina, Esplanade, Jordan, North Monashee, North Selkirk, Badshot-Battle, Central Selkirk, Goat, Gold, Kokanee, Retallack, Valhalla, Whatshan.

The main concern is wind slabs in exposed terrain, which may rest on a weak surface hoar layer in some areas, increasing their reactivity.

Confidence

Moderate

Avalanche Summary

Numerous avalanches were reported across the region in the alpine and treeline on Tuesday. Most were small wind slabs and loose dry slides, size 1 to 1.5, with a few larger size 2 reported. Several were triggered by riders, with naturally triggered avalanches also observed.

Avalanche activity over preceding days also involved wind slabs. At least one ran on a surface hoar layer buried in early January on a southwest alpine aspect.

Snowpack Summary

Up to 15 cm of low-density new snow has fallen over the last few days, with another 0 to 5 cm expected by 4 pm Thursday. This snow has buried a variety of surfaces including sun crust, surface hoar and facets.

The snow surface is likely wind-affected in most open areas at all elevations.

A secondary layer of weak surface hoar from early January is buried 25 to 50 cm. This layer has most recently only been reactive where wind slabs have formed above it.

A crust/facet/surface hoar layer from early December may be found 90 to 160 cm deep. Avalanche activity on this layer has tapered in recent weeks.

Weather Summary

Wednesday Night

Mainly cloudy with isolated flurries, accumulation 0 to 4 cm. 10 to 30 km/h variable ridgetop wind. Treeline high temperature -15 °C.

Thursday

Increasing cloud, with scattered flurries, accumulation 2 to 6 cm. 25 to 35 km/h westerly ridgetop wind. Treeline high temperature -9 °C.

Friday

A mix of sun and cloud. 30 to 45 km/h northwest ridgetop wind. Treeline high temperature -12 °C.

Saturday

Sunny. 15 km/h northwest ridgetop wind. Treeline high temperature -12 °C.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Seek out sheltered terrain where new snow hasn't been affected by wind.
  • Avoid areas where the snow feels stiff and/or slabby.
  • Back off if you encounter whumpfing, hollow sounds, or shooting cracks.
  • Be aware of the potential for remote triggering and large avalanches due to buried surface hoar.

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.