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Avalanche Forecast

Archived

Nov 28th, 2022–Nov 29th, 2022

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

Regions

Yukon, Tutshi, Wheaton, White Pass East, White Pass West.

Shifting winds continue to produce wind slabs on a variety of aspects at upper elevations.

Avoid steep, rocky, and wind-affected areas where triggering slabs are more likely.

Confidence

Low

Avalanche Summary

Some reactive wind slab activity was reported by people submitting to the Mountain Information Network. Please continue to share any of your observations via the Mountain Information Network to help us and fellow recreationists.

Snowpack Summary

A thin snowpack exists in most areas, with 65 to 85 cm found at White Pass. Upwards of 100 cm may be found in wind-loaded areas.

Heavily wind-affected snow can be found predominantly above 1000 m. Wind slabs have been reported on north and east-facing slopes but are likely to be found on all aspects.

Weather Summary

Monday Night

Mostly cloudy, 0 to 3 cm accumulation, winds north 35 km/h, temperatures reaching -15 C.

Tuesday

A mix of sun and cloud, trace accumulation, winds north to northeast 40 to 50 km/h, -20C.

Wednesday

Mostly clear skies, no accumulation, winds out of the north 20 to 35 km/h, temperatures -20 to -30 C.

Thursday

Cloudy, 4 - 8 cm accumulation, winds northeast 20 to 30 km/h, temperatures around -15 C.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Recent wind has varied in direction so watch for wind slabs on all aspects.
  • Watch for newly formed and reactive wind slabs as you transition into wind affected terrain.
  • Watch for signs of instability like whumpfing, hollow sounds, shooting cracks or recent avalanches.
  • Avoid steep, rocky, and wind effected areas where triggering slabs is more likely.

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.