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Avalanche Forecast

Archived

Nov 22nd, 2024–Nov 24th, 2024

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

Regions

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

Flurries will continue as this storm wraps up over the next few days. As snow tapers, winds will start to pick up. Watch for alpine wind loading. If you can't see the terrain above, assume its happening and limit overhead exposure.

Confidence

Moderate

Avalanche Summary

Skies have been obscured, direct observations are limited. Given the sensitivity to loading it would be natural to expect the small cycle from the past few days carried over into today...we just can't see it.

Snowpack Summary

Despite the continuous snowfall, we are seeing very little for overall snowpack growth. This is a good thing. It means the snow is settling as fast as it falls which translates into our snowpack gaining a bit of strength and hopefully starting to support the weight of a person. The flipside to this coin is the increased likelihood of encountering "storm" or settlement slabs in the lower alpine/higher treeline areas. So far we've seen these soft slabs at the bottom of large cliffs and large, planar open areas. As always, anticipate wind slabs in immediate lee, alpine areas. These have started to appear in the higher elevation, wind prone areas. The Oct crust remains the biggest concern within our young snowpack. It seems to be especially sensitive to snow loading and deserves some respect. The crust is more prevalent and widespread on polar aspects. When anticipating where it may be, remember that our snow coverage was spotty back in October.

Weather Summary

Flurries and light snow will continue for the next 3 days. Some models are suggesting as much as 15cm by tomorrow afternoon, but given the underwhelming performance of this latest storm, don't bet the farm on the 15. Winds will be mostly from the W, but occasionally spin around to the NW. 2700m wind speeds will still be in the light range, with ridge speeds up to 25km. Temperatures will hold close to -8 for Sunday.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Continue to make conservative terrain choices while the storm snow settles and stabilizes.
  • Be careful with wind-loaded pockets, especially near ridge crests and rollovers.
  • Keep in mind a buried crust offers an excellent bed surface for avalanches.

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.

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.