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Archived

Avalanche Forecast

Mar 11th, 2017–Mar 12th, 2017
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
Treeline
3: Considerable
The avalanche danger rating at treeline will be considerable
Below Treeline
2: Moderate
The avalanche danger rating below treeline will be moderate
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
2: Moderate
The avalanche danger rating below treeline will be moderate
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

Regions: Kananaskis.

Wind, new snow and warm temps have created new windslabs in the last 24 hours.

Confidence

High -

Weather Forecast

The strong westerly winds will continue overnight. Alpine temps will fall to the -7 range. Tomorrow will have isolated flurries with no significant accumulation. The winds will be 30-40km/hr from the west. While not part of our forecast, its worth mentioning the solar radiation is noticeable these days. Expect clear skies or thin cloud to have an impact on southerly exposures.

Avalanche Summary

Nothing from the last 24hrs.

Snowpack Summary

Moderate to strong SW winds have contributed to new, alpine windslabs on N-S aspects. Fortunately these are easy to spot and predict in terms of location. In terms of "triggerability", it felt as though these could be easily triggered in steep, convex terrain. Treeline also had these slabs, however they were limited to wind exposed areas. For the deeper layers, the situation is still the same as it has been. To make a long story short, the deeper layers are widespread and very difficult, if not impossible to trust. Below treeline the warm temps made for moist, sticky snow that will form a thin crust overnight.

Avalanche Problems

Wind Slabs

There are multiple layers of slabs out there. It's hard to identify just one as a problem. Recognize that it is possible for a small surface slab to start a chain reaction that could go all the way to the bottom of the snowpack.
Minimize exposure to overhead hazard from cornices.Caution in lee and cross-loaded terrain near ridge crests.

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

Elevations: Alpine, Treeline.

Likelihood: Possible - Likely

Expected Size: 1 - 3

Deep Persistent Slabs

Similar to the windslab problem, these deeper layers consist of many weak layers being lumped together into a single problem. The take home point is the fact that they are near the bottom of the snowpack and any avalanche involving them will be big!
Be aware of the potential for wide propagations.Avoid exposure to overhead avalanche terrain, large avalanches may reach the end of run out zones.Pay attention to overhead hazards like cornices which could easily trigger the deep persistent slab.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Unlikely - Possible

Expected Size: 2 - 4