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Avalanche Forecast

Archived

Dec 17th, 2023–Dec 18th, 2023

Alpine
Natural and human triggered avalanches likely.
Treeline
Natural avalanches possible, human triggered probable.
Below Treeline
Below Threshold.
Alpine
Natural and human triggered avalanches likely.
Treeline
Natural avalanches possible, human triggered probable.
Below Treeline
Below Threshold.
Alpine
Natural avalanches possible, human triggered probable.
Treeline
Natural avalanches possible, human triggered probable.
Below Treeline
Below Threshold.

Regions

Yukon, Tutshi, Wheaton, White Pass East, White Pass West.

Exercise caution when choosing terrain following recent storms and closely monitor the bonding of new snow to existing surfaces.

Confidence

Moderate

Snowpack Summary

Recent storm snow of up to 100 cm in the last 5 days combined with south wind redistribution, has led to wind packing on south slopes and deep wind deposition on north slopes. Below 1200 meter elevation, a thick crust is present approximately 50 cm above the ground. Snow depths varies from 75-250 cm depending on the aspect, while the mid and lower snowpack is presenting as settled and bonded.

Weather Summary

Sunday Night

Mostly cloudy, 5 to 10 cm accumulation, ridgetop winds southwest 55 to 65 km/h, treeline temperature - 6 °C. 

Monday

Partly cloudy, trace accumulation, ridgetop winds variable 10 km/h, treeline temperature -8 °C. 

Tuesday

Sunny with cloudy periods, no accumulation, ridgetop winds south 15 km/h treeline temperature -12 °C.

Wednesday

Increasing clouds, 1 to 5cm accumulation, ridgetop winds southwest 50 to 70 km/h, treeline temperature -12 °C. 

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Avoid freshly wind loaded terrain features.
  • Choose low-angled, sheltered terrain where new snow hasn't been wind-affected.
  • Watch for fresh storm slabs building throughout the day.

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.