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Archived

Avalanche Forecast

Jan 28th, 2019–Jan 29th, 2019
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
2: Moderate
The avalanche danger rating below treeline will be moderate
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
2: Moderate
The avalanche danger rating below treeline will be moderate
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
2: Moderate
The avalanche danger rating below treeline will be moderate

Regions: Glacier.

Watch for a reactive soft slab below tree-line on unsupported features today. And put on some sunscreen!

Weather Forecast

Calm and clear, with plenty of sunshine. Alpine high of -8*C, light Northerly winds, and no snow today. More of the same tomorrow, with slightly warmer alpine temps (-6*C) and light winds. A system will start to move into the area by the end of the week, bringing 20-30cm by Friday with warming temp's.

Snowpack Summary

Strong southerly winds have created a variable wind slab in lee and cross-loaded alpine and tree-line features. The Jan 17 persistent weak layer (surface hoar or suncrust) is buried 30-50cm, and is most reactive in sheltered areas below tree-line.

Avalanche Summary

Numerous natural avalanches up to sz 2.5 from steep N and S alpine features (Macdonald and Tupper) were observed in the highway corridor. A cornice failure did produce a sz 3 from Tractor Shed W. Field teams were able to ski cut soft slabs to size 1 on steep, unsupported features below tree-line (Asulkan and Bostock drainages).

Confidence

Avalanche Problems

Persistent Slabs

The Jan 17th layer is down 30-50cm and consists of surface hoar in sheltered areas and sun crust on steep solar aspects. This layer is most problematic between 1600-1800m, and sensitive to human triggering.
Convex features and steep unsupported slopes will be most prone to triggering.Use caution on open slopes and convex rolls where buried surface hoar may be preserved.

Aspects: All aspects.

Elevations: Treeline, Below Treeline.

Likelihood: Possible

Expected Size: 1 - 2

Wind Slabs

Strong S winds have created variable wind slabs at tree-line and above. The slab varies from soft/skiable to perfect igloo-block building crud. Expect a range of surface conditions if you go up high today.
Use caution in lee and cross-loaded terrain near ridge crests.Watch for shooting cracks or stiffer feeling snow. Avoid areas that appear wind loaded.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1 - 2