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Avalanche Forecast

Archived

Dec 9th, 2017–Dec 10th, 2017

Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches unlikely.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.

Regions

Kananaskis.

This unique weather pattern hasn't had the negative impact that was originally expected. Lots of good skiing can still be had, especially on the shady aspects. Enjoy the skiing, but don't switch to auto pilot and turn the "avalanche radar" off.

Confidence

High -

Weather Forecast

Tomorrow will see the temperature inversion continue. Alpine highs are expected to be around 2°. Winds will be from the west and be about 40km/hr. Mostly sunny with occasional cloud.

Avalanche Summary

Some minor pin wheeling out of very steep, south facing terrain today.

Snowpack Summary

Significant surface hoar growth in low areas in the last 36-48 hours. It is found up to 2100m, and in some cases it is very large(20-30mm). Luckily the warmer temperatures above haven't allowed it to grow in the alpine or treeline areas. The warmth has also settled the treeline and alpine snow considerably. Non-polar aspects have settled snow, while steep solar aspects have moist snow and/or sun crusts in steeper areas by mid afternoon. The various crusts seem to be hanging in there with limited degradation in the last while. An alpine snow pit today had test results showing a good bond among the various layers. Wind prone areas still have a wind slab that may react to a skier's/rider's weight.

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.

Persistent Slabs

Persistent Slab avalanches are the release of a cohesive layer of snow (a slab) in the middle to upper snowpack, when the bond to an underlying persistent weak layer breaks. Persistent layers include: surface hoar, depth hoar, near-surface facets, or faceted snow. Persistent weak layers can continue to produce avalanches for days, weeks or even months, making them especially dangerous and tricky. As additional snow and wind events build a thicker slab on top of the persistent weak layer, this avalanche problem may develop into a Deep Persistent Slab.