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Avalanche Forecast

Archived

Feb 19th, 2022–Feb 20th, 2022

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

Regions

Yukon.

Wind loaded pockets may be triggerable by humans or machines especially in steep, convex or extreme terrain.

Confidence

Low - Uncertainty is due to the limited number of field observations.

Weather Forecast

Saturday night: Flurries around 3 cm, ridgetop winds picking up to moderate northwest, low of -13.

Sunday: A mix of sun and cloud, ridgetop winds moderate northwest, high of -12.

Monday: Sunny, ridgetop winds light northwest, high of -15.

Tuesday: Flurries, strong southwest wind, high of -10.

Avalanche Summary

We have received no reports of recent avalanche activity or signs of instability.

Snowpack Summary

10-20 cm of recent snow appears to be bonding well to a variety of underlying surfaces including 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) at the base of the snowpack appear to be rounding and bonding in the mild temperatures.

Terrain and Travel

  • Recent wind has varied in direction so watch for wind slabs on all aspects.
  • Pay attention to isolated alpine features as well as cross-loaded features at treeline.
  • Look for signs of instability: whumphing, hollow sounds, shooting cracks, and recent avalanches.
  • Small avalanches can have serious consequences in extreme terrain. Carefully evaluate your line for wind slab hazard before you commit to it.

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.