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Avalanche Forecast

Archived

Dec 2nd, 2023–Dec 2nd, 2023

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

Regions

Kananaskis, Bow Valley, Highwood Pass, North 40, Spray - KLakes.

Blustery weather will bring slight changes to our snow pack. Not enough to make the travel any more appealing, but enough that we may see changes in avalanche conditions. Watch local winds and snow amounts carefully.

Confidence

Moderate

Avalanche Summary

No new observed or reported.

Snowpack Summary

Facets, depth hoar, crusts and surface hoar are the major players in our snowpack right now. A real who's who of bad grain types. Valley bottom is very thin for coverage, with all areas being weak facets. Treeline has more snow, but again coverage is variable. Winds have scoured ridges and open areas to ground, leaving gullies and depressions loaded with windslabs of various densities. And the alpine? It's mostly exposed rock, or growing patches of wind distributed snow that are beginning to connect terrain features.

We also need to discuss the surface hoar as its about to be buried, even if it is under only 2cm of snow. Right now we're assuming it is widespread up to the lower margin of the alpine. We're crossing our fingers that the winds have at least partially blown it away at alpine elevations, or the inversion prevented it from forming in the first place. 2 cm certainly won't cause an avalanche problem, but it will preserve this delicate layer, particularly in sheltered areas. The distribution of this layer will weigh heavily on our minds as the season goes on.

Weather Summary

The overnight low will be -16, with a daytime high of -8. Flurries should continue for most of the day, with accumulations of a whopping 2.1cm. Winds will be a bit erratic tomorrow with ridgeline gusts into the moderate range. Expect some wind transport.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Avoid terrain traps where the consequence of any avalanche could be serious.
  • Approach lee and cross-loaded slopes with caution.

Problems

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.