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Archived

Avalanche Forecast

Dec 26th, 2014–Dec 27th, 2014
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
1: Low
The avalanche danger rating below treeline will be low
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
1: Low
The avalanche danger rating below treeline will be low
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
1: Low
The avalanche danger rating below treeline will be low

Regions: Jasper.

Loose snow sluffing out of steep rocky alpine terrain will be a concern for ice climbers.

Weather Forecast

Increasing NW winds overnight with 3-6 cm of snow.  Cool temperatures.  Skies clear on Sunday with light NW winds dropping temperatures in to low -20's.

Snowpack Summary

New wind slab forming from reverse loading Northerly winds along cross-loaded gulley features. The interface between the strong mid-pack and weaker basal facets is most susceptible to human triggering from shallow rocky areas.

Avalanche Summary

Very thin loose snow avalanches observed on East and West alpine aspects from steep rocky terrain. Some very thin slab avalanches (Size 0.5) on reversed cross-loaded gulley features.

Confidence

Timing, track, or intensity of incoming weather system is uncertain on Sunday

Avalanche Problems

Wind Slabs

Northerly winds reverse loading cross-loaded gulley features. Previous wind slab from SW winds appear to be well bonded to snow below.
Be cautious as you transition into wind affected terrain.Avoid travelling in areas that have been reverse loaded by winds.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1 - 2

Deep Persistent Slabs

This weak layer exists below a strong mid-pack at treeline and sub-alpine elevations. Large loads such as surface slides or cornice collapse could trigger this deep persistent weakness.
Carefully evaluate and use caution around thin snowpack areas.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1 - 3