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Avalanche Forecast

Archived

Feb 22nd, 2022–Feb 23rd, 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.
Below Treeline
Below Threshold.

Regions

Yukon.

Recent winds have varied in direction and were cranking at the highway on Tuesday so expect wind loading on all aspects and elevations. Watch for signs of instability like cracking and recent avalanches and be ready to back off into lower angle or less wind-loaded terrain.

Confidence

High -

Weather Forecast

Tuesday night: Flurries bringing up to 5 cm, strong southwest wind easing by morning, low of -12.

Wednesday: Sunny, light variable wind, high of -8.

Thursday: A mix of sun and cloud, moderate to strong southwest wind, high of -6.

Friday: A mix of sun and cloud, strong southwest wind, high of -4.

Avalanche Summary

We have received no reports of recent avalanche activity.

Snowpack Summary

Surface snow has been extensively wind affected by outflows on Monday followed by strong southwest flow Tuesday.

A shallowly buried crust (around 20 cm deep) extends up to at least 1200 m on all aspects. It appears to be well bonded to surrounding snow, and is beginning to break down. Below this, the mid-pack is generally well-settled and strong in most areas. The basal snowpack consists of weak, sugary facets.

Terrain and Travel

  • Recent wind has varied in direction so watch for wind slabs on all aspects.
  • Keep your guard up at lower elevations. Wind slab formation has been extensive.
  • Watch for areas of hard wind slab on alpine features.
  • Watch for signs of instability like whumpfing, hollow sounds, shooting cracks or recent avalanches.

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.