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Avalanche Forecast

Archived

Feb 16th, 2022–Feb 17th, 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.

Strong southwesterly winds may form reactive wind slabs on lee features. Watch for newly formed and reactive wind slabs as you transition into wind affected terrain. 

Confidence

High -

Weather Forecast

WEDNESDAY NIGHT: Mostly cloudy with isolated flurries; 0-3 cm / Ridgetop winds strong, southwest / Low of -6.

THURSDAY: Cloudy with flurries; 3-5 cm / Ridgetop winds moderate, west / High of -4.

FRIDAY: Mix of sun and cloud with isolated flurries; 0-3 cm / Ridgetop winds moderate, southwest / High of -3.

SATURDAY: Cloudy with isolated flurries; 0-3 cm / Ridgetop winds light, west / High of -5.

Avalanche Summary

No new avalanches were reported on Tuesday.

Snowpack Summary

Around 10 cm of recent snow and strong southerly winds are building fresh wind slabs on lee features. 

These wind slabs are sitting on a variety of wind affected surfaces and/or a crust that extends up to at least 1200 m on all aspects. Below this, the mid-pack is generally well-settled and strong in most areas.

Weak facets (sugary snow) exist at the base of the snowpack, especially in more shallow snowpack areas such as the Inland areas.

Terrain and Travel

  • Watch for newly formed and reactive wind slabs as you transition into wind affected terrain.
  • Wind slabs may be poorly bonded to the underlying crust.
  • Wind slabs are most reactive during their formation.
  • Look for signs of instability: whumphing, hollow sounds, shooting cracks, and 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.