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Archived

Avalanche Forecast

Feb 18th, 2015–Feb 19th, 2015
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
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
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
1: Low
The avalanche danger rating below treeline will be low

Regions: Jasper.

Careful with increasing solar inputs Cornices are large and looming-give them a wide berth.

Weather Forecast

Flurries expected Thursday and Friday though not expected to amount to much.  Above seasonal temperatures are expected and rain could fall in the valley bottoms.

Snowpack Summary

Surface hoar continues to grow at all elevations.  Up to 50cm of settled snow overlies a variety of crusts and provides good travel.  These firmer upper layers are resting on 50-75cm of weak, poorly bonded faceted snow crystals. Cornice drops and step downs could trigger large avalanches in the alpine.

Avalanche Summary

No new avalanches were observed or reported today.

Confidence

Track of incoming weather systems is uncertain on Thursday

Avalanche Problems

Wind Slabs

Caution in shallow and unsupported areas where wind slab has formed.
Use caution in lee areas in the alpine. Recent wind loading have created wind slabs.If triggered the storm/wind slabs may step down to deeper layers resulting in large avalanches.

Aspects: North, North East, East, South East, South.

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1 - 2

Deep Persistent Slabs

Cornice failures or skier travel in shallow snowpack areas are likely ways to trigger this deep weakness in the snowpack.
Avoid exposure to overhead avalanche terrain, large avalanches may reach the end of run out zones.Avoid shallow snowpack areas where triggering is more likely.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 2 - 4