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Avalanche Forecast

Archived

Dec 1st, 2021–Dec 2nd, 2021

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

Regions

Yukon.

Wind slabs may be reactive on a variety of aspects at alpine and treeline elevations due to shifting winds. 

Confidence

Moderate - Confidence is due to a stable weather pattern with little change expected.

Weather Forecast

Wednesday night: Flurries up to 5 cm. Strong southwest wind. Alpine temperature around -12 C.

Thursday: Flurries up to 5 cm. Moderate southwest wind. Alpine temperature around -15 C.

Friday: Mix of sun and cloud with isolated flurries. Light southerly wind. Alpine temperature around -18 C. 

Saturday: Mix of sun and cloud. Light to moderate southwest wind. Alpine temperature around -14 C.

Avalanche Summary

No recent reports of avalanche activity. Over the weekend, large natural avalanches (size 2 and 2.5) were on alpine lee features. A MIN report also noted a slab release size 2 above Bryant Lake.

Lots of whumpfing and cracking have been notified across the region and are most likely to be associated with early-season shallow snowpack and wind-affected snow.

We were delighted to receive so many submissions to the Mountain Information Network last weekend! Keep it up! ?

Snowpack Summary

Incremental inputs of new snow continue to feed wind slab formation. Surface snow is wind affected on most aspects above the treeline. Whumfing and cracking has been observed where wind slabs sit on top of a weak, faceted lower snowpack which may also contain a crust layer.

Snow depths are approximately 80 cm at treeline and 100-120 in the alpine.

Terrain and Travel

  • Recent wind has varied in direction so watch for wind slabs on all aspects.
  • Wind slabs are most reactive during their formation.
  • Approach lee and cross-loaded slopes with caution.
  • Be especially cautious near rock outcroppings, on steep convexities and anywhere the snowpack feels thinner than average.

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.