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Archived

Avalanche Forecast

Dec 1st, 2021–Dec 2nd, 2021
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
Below Threshold
The avalanche danger rating below treeline will be below threshold
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
1: Low
The avalanche danger rating at treeline will be low
Below Treeline
Below Threshold
The avalanche danger rating below treeline will be below threshold
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
1: Low
The avalanche danger rating at treeline will be low
Below Treeline
Below Threshold
The avalanche danger rating below treeline will be 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.

Avalanche Problems

Wind Slabs

Changing winds and light snowfall amounts may form touchy wind slabs on all aspects above treeline. Cracking and whumfing in the upper snowpack are indicators of wind slab. Human triggering is possible. 

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1 - 2.5